publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2001-07-19 | The Altitude of an Infrared Bright Cloud Feature on Neptune from Near-Infrared Spectroscopy | We present 2.03-2.30 micron near-infrared spectroscopy of Neptune taken 1999
June 2 (UT) with the W.M. Keck Observatory's near-infrared spectrometer
(NIRSPEC) during the commissioning of the instrument. The spectrum is dominated
by a bright cloud feature, possibly a storm or upwelling, in the southern
hemisphere at app... | 0107361v1 |
2002-03-20 | Observation of X-ray variability in the BL Lac object 1ES1959+65 | This paper reports X-ray spectral observations of a relatively nearby z =
0.048 BL Lacertae (BL Lac) object 1ES1959+650, which is a potential TeV
emitter. The observations include 31 short pointings made by the Unconventional
Stellar Aspect (USA) Experiment on board the Advanced Research and Global
Observation Satellit... | 0203335v1 |
2002-06-18 | Near-IR and Optical Morphology of Spiral Galaxies | We announce the initial release of data from the Ohio State University Bright
Spiral Galaxy Survey, a BVRJHK imaging survey of a well-defined sample of 205
bright, nearby spiral galaxies. We present H-band morphological classification
on the Hubble sequence for the OSU Survey sample. We compare the H-band
classificatio... | 0206320v1 |
2003-02-20 | The Reionization History at High Redshifts I: Physical Models and New Constraints from CMB Polarization | The recent discovery of a high optical depth tau to Thomson scattering from
the WMAP data implies that significant reionization took place at redshifts
z~15. This discovery has important implications for the sources of
reionization, and allows, for the first time, constraints to be placed on
physical reionization scena... | 0302403v2 |
2004-06-07 | Dynamics and Stellar Content of the Giant Southern Stream in M31. I. Keck Spectroscopy of Red Giant Stars | We present results from a large spectroscopic survey of M31 red giants using
the Keck telescope/DEIMOS. Photometric pre-screening, based on the 100A-wide
DDO51 band centered on the Mgb/MgH feature, was used to select spectroscopic
targets. Red giant candidates were targeted in a small field on M31's giant
southern tida... | 0406145v1 |
2004-07-14 | Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database | We present improved black hole masses for 35 active galactic nuclei (AGNs)
based on a complete and consistent reanalysis of broad emission-line
reverberation-mapping data. From objects with multiple line measurements, we
find that the highest precision measure of the virial product is obtained by
using the cross-correl... | 0407299v1 |
2005-02-06 | SINFONI in the Galactic Center: young stars and IR flares in the central light month | We report 75 milli-arcsec resolution, near-IR imaging spectroscopy within the
central 30 light days of the Galactic Center [...]. To a limiting magnitude of
K~16, 9 of 10 stars in the central 0.4 arcsec, and 13 of 17 stars out to 0.7
arcsec from the central black hole have spectral properties of B0-B9, main
sequence st... | 0502129v1 |
2005-02-18 | Discovery of an extended halo of metal-poor stars in the Andromeda spiral galaxy | Understanding galaxy formation involves look-back and fossil-record studies
of distant and nearby galaxies, respectively. Debris trails in our Galaxy's
spheroidal halo of old stars provide evidence of "bottom-up" formation via
tidal disruption/merging of dwarf satellite galaxies, but it is difficult to
study our Galaxy... | 0502366v5 |
2005-04-12 | Constrained Cluster Parameters from Sunyaev-Zel'dovich Observations | Near-future SZ surveys such as ACT, SPT, APEX, and Planck will find thousands
of galaxy clusters. Multi-frequency arcminute-resolution SZ observations can,
in principle, determine each cluster's gas temperature (T_e), bulk velocity
(v_pec), and optical depth (tau). However, the frequency bands and detector
sensitivity ... | 0504274v3 |
2005-10-03 | High Spectral Resolution Observations of the Massive Stars in the Galactic Center | We present high-resolution near-infrared spectra, obtained with the NIRSPEC
spectrograph on the W. M. Keck II Telescope, of a collection of hot, massive
stars within the central 25 arcseconds of the Galactic center. We have
identified a total of twenty-one emission-line stars, seven of which are new
radial velocity det... | 0510028v2 |
2005-12-06 | Kinematics and Metallicity of M31 Red Giants: The Giant Southern Stream and Discovery of a Second Cold Component at R = 20 kpc | We present spectroscopic observations of red giant branch (RGB) stars in the
Andromeda spiral galaxy (M31), acquired with the DEIMOS instrument on the Keck
II 10-m telescope. The three fields targeted in this study are in the M31
spheroid, outer disk, and giant southern stream. In this paper, we focus on the
kinematics... | 0512161v1 |
2006-02-28 | Rejecting Astrophysical False Positives from the TrES Transiting Planet Survey: The Example of GSC 03885-00829 | Ground-based wide-field surveys for nearby transiting gas giants are yielding
far fewer true planets than astrophysical false positives, of which some are
difficult to reject. Recent experience has highlighted the need for careful
analysis to eliminate astronomical systems where light from a faint eclipsing
binary is b... | 0603005v1 |
2006-03-21 | SINFONI Integral Field Spectroscopy of z~2 UV-selected Galaxies: Rotation Curves and Dynamical Evolution | We present 0.5" resolution near-IR integral field spectroscopy of the Ha line
emission of 14 z~2 UV-selected BM/BX galaxies obtained with SINFONI at ESO/VLT.
The mean Ha half-light radius r_1/2 is about 4kpc and line emission is detected
over > ~20kpc in several sources. In 9 sources, we detect spatially-resolved
veloc... | 0603559v1 |
2006-05-06 | The Metal-Poor Halo of the Andromeda Spiral Galaxy (M31) | We present spectroscopic observations of red giant branch (RGB) stars over a
large expanse in the halo of the Andromeda spiral galaxy (M31), acquired with
the DEIMOS instrument on the Keck II 10-m telescope. Using a combination of
five photometric/spectroscopic diagnostics -- (1) radial velocity, (2)
intermediate-width... | 0605170v1 |
2006-05-08 | A New Method for Isolating M31 Red Giant Stars: The Discovery of Stars out to a Radial Distance of 165 Kiloparsecs | We present a method for isolating a clean sample of red giant stars in the
outerregions of the Andromeda spiral galaxy (M31) from an ongoing spectroscopic
survey using the DEIMOS instrument on the Keck 10-m telescope. The survey aims
to study the kinematics, global structure, substructure, and metallicity of
M31's halo... | 0605171v2 |
2006-06-21 | Extreme gas kinematics in the z=2.2 powerful radio galaxy MRC1138-262: Evidence for efficient AGN feedback in the early Universe? | To explain the properties of the most massive low-redshift galaxies and the
shape of their mass function, recent models of galaxy evolution include strong
AGN feedback to complement starburst-driven feedback in massive galaxies. Using
the near-infrared integral-field spectrograph SPIFFI on the VLT, we searched
for dire... | 0606530v1 |
2006-05-02 | Proton NMR measurements of the local magnetic field in the paramagnetic metal and antiferromagnetic insulator phases of $λ$-(BETS)$_{2}$FeCl$_{4}$ | Measurements of the $^{1}$H-NMR spectrum of a small ($\sim$ 4 $\mu$g) single
crystal of the organic conductor $\lambda$-(BETS)$_{2}$FeCl$_{4}$ are reported
with an applied magnetic field $\bf{B}$$_{0}$ = 9 T parallel to the a-axis in
the $ac$-plane over a temperature $(T)$ range 2.0 $-$ 180 K. They provide the
distribu... | 0605044v2 |
2006-09-07 | $^{1}$H-NMR spin-echo measurements of the static and dynamic spin properties in $λ$-(BETS)$_{2}$FeCl$_{4}$ | $^{1}$H-NMR spin-echo measurements of the spin-echo decay $M(2\tau)$ with a
decay rate 1/$T_{2}$ and the frequency shift $\Delta\nu/\nu_{0}$ under applied
magnetic field $\mathbf{B}$$_{0}$ = 9 T along the a-axis over a temperature
range 2.0$-$180 K are reported for a single crystal of the organic conductor
$\lambda$-(B... | 0609151v2 |
2007-05-14 | TrES-3: A Nearby, Massive, Transiting Hot Jupiter in a 31-Hour Orbit | We describe the discovery of a massive transiting hot Jupiter with a very
short orbital period (1.30619 d), which we name TrES-3. From spectroscopy of
the host star GSC 03089-00929, we measure T_eff = 5720 +- 150 K, logg=4.6 +-
0.3, and vsini < 2 km/s, and derive a stellar mass of 0.90 +- 0.15 M_sun. We
estimate a plan... | 0705.2004v1 |
2007-08-06 | TrES-4: A Transiting Hot Jupiter of Very Low Density | We report the discovery of TrES-4, a hot Jupiter that transits the star GSC
02620-00648 every 3.55 days. From high-resolution spectroscopy of the star we
estimate a stellar effective temperature of Teff = 6100 +/- 150 K, and from
high-precision z and B photometry of the transit we constrain the ratio of the
semi-major ... | 0708.0834v1 |
2007-08-30 | Compact radio sources and jet-driven AGN feedback in the early Universe: Constraints from integral-field spectroscopy | To investigate the impact of radio jets during the formation epoch of their
massive host galaxies, we present an analysis of two massive, log(M_stel/
M_sun)~10.6 and 11.3, compact radio galaxies at z=3.5, TNJ0205+2242 and
TNJ0121+1320. Their small radio sizes (R<= 10 kpc) are most likely a sign of
youth. We compare the... | 0708.4150v1 |
2008-08-19 | The Extended Star Formation History of the Andromeda Spheroid at 35 Kpc on the Minor Axis | Using the HST ACS, we have obtained deep optical images reaching well below
the oldest main sequence turnoff in fields on the southeast minor-axis of the
Andromeda Galaxy, 35 kpc from the nucleus. These data probe the star formation
history in the extended halo of Andromeda -- that region beyond 30 kpc that
appears bot... | 0808.2648v1 |
2008-09-30 | Evidence for powerful AGN winds at high redshift: Dynamics of galactic outflows in radio galaxies during the "Quasar Era" | AGN feedback now appears as an attractive mechanism to resolve some of the
outstanding problems with the "standard" cosmological models, in particular
those related to massive galaxies. To directly constrain how this may influence
the formation of massive galaxies near the peak in the redshift distribution of
powerful ... | 0809.5171v2 |
2009-02-16 | The Role of Dwarf Galaxies in Building Large Stellar Halos | The hierarchical theory of galaxy formation rests on the idea that smaller
galactic structures merge to form the galaxies that we see today. The past
decade has provided remarkable observational support for this scenario, driven
in part by advances in spectroscopic instrumentation. Multi-object spectroscopy
enabled the... | 0902.2591v2 |
2009-06-12 | Mass and radius determinations for five transiting M-dwarf stars | We have derived masses and radii for both components in five short-period
single-lined eclipsing binary stars discovered by the TrES wide-angle
photometric survey for transiting planets. All these systems consist of a
visible F-star primary and an unseen M-star secondary (M_A > 0.8 M_sun, M_B <
0.45 M_sun). The spectro... | 0906.2207v2 |
2009-06-23 | GJ 3236: a new bright, very low-mass eclipsing binary system discovered by the MEarth observatory | We report the detection of eclipses in GJ 3236, a bright (I = 11.6) very low
mass binary system with an orbital period of 0.77 days. Analysis of light- and
radial velocity curves of the system yielded component masses of 0.38 +/- 0.02
and 0.28 +/- 0.02 Msol. The central values for the stellar radii are larger
than the ... | 0906.4365v1 |
2009-07-03 | The NGC 300 Transient: An Alternative Method For Measuring Progenitor Masses | We present an alternative technique for measuring the precursor masses of
transient events in stars undergoing late stage stellar evolution. We use the
well-established techniques of stellar population modeling to age-date the
stars surrounding the site of the recent transient event in NGC 300 (NGC 300
OT2008-1). The s... | 0907.0710v2 |
2009-08-03 | A binary engine fuelling HD87643' s complex circumstellar environment, using AMBER/VLTI | Context. The star HD 87643, exhibiting the "B[e] phenomenon", has one of the
most extreme infrared excesses for this object class. It harbours a large
amount of both hot and cold dust, and is surrounded by an extended reflection
nebula. Aims. One of our major goals was to investigate the presence of a
companion in HD87... | 0908.0227v2 |
2009-08-12 | Refined stellar, orbital and planetary parameters of the eccentric HAT-P-2 planetary system | We present refined parameters for the extrasolar planetary system HAT-P-2
(also known as HD 147506), based on new radial velocity and photometric data.
HAT-P-2b is a transiting extrasolar planet that exhibits an eccentric orbit. We
present a detailed analysis of the planetary and stellar parameters, yielding
consistent... | 0908.1705v2 |
2009-09-17 | The SPLASH Survey: A Spectroscopic Analysis of the Metal-Poor, Low-Luminosity M31 dSph Satellite Andromeda X | Andromeda X (And X) is a newly discovered low-luminosity M31 dwarf spheroidal
galaxy (dSph) found by Zucker et al. (2007) in the Sloan Digital Sky Survey
(SDSS - York et al. 2000). In this paper, we present the first spectroscopic
study of individual red giant branch stars in And X, as a part of the SPLASH
Survey (Spec... | 0909.3298v1 |
2009-11-11 | The SPLASH Survey: Internal Kinematics, Chemical Abundances, and Masses of the Andromeda I, II, III, VII, X, and XIV dSphs | We present new Keck/DEIMOS spectroscopic observations of hundreds of
individual stars along the sightline to Andromeda's first three discovered
dwarf spheroidal galaxies (dSphs) - And I, II, and III, and leverage recent
observations by our team of three additional dSphs, And VII, X, and XIV, as a
part of the SPLASH Sur... | 0911.1998v3 |
2009-11-19 | Local Group Dwarf Elliptical Galaxies: II. Stellar Kinematics to Large Radii in NGC 147 and NGC 185 | We present kinematic and metallicity profiles for the M31 dwarf elliptical
(dE) satellite galaxies NGC 147 and NGC 185. The profiles represent the most
extensive spectroscopic radial coverage for any dE galaxy, extending to a
projected distance of eight half-light radii (8 r_eff = 14'). We achieve this
coverage via Kec... | 0911.3654v2 |
2009-11-20 | The ACS Nearby Galaxy Survey Treasury IV. The Star Formation History of NGC 2976 | We present resolved stellar photometry of NGC 2976 obtained with the Advanced
Camera for Surveys (ACS) as part of the ACS Nearby Galaxy Survey Treasury
(ANGST) program. The data cover the radial extent of the major axis of the disk
out to 6 kpc, or ~6 scale lengths. The outer disk was imaged to a depth of
M_F606W ~ 1, ... | 0911.4121v1 |
2009-12-07 | OB Stars & Stellar Bowshocks in Cygnus-X: A Novel Laboratory Estimating Stellar Mass Loss Rates | We use mid-IR images from the Spitzer Cygnus~X Legacy Survey to search for
stellar bowshocks, a signature of early type "runaway" stars with high space
velocities. We identify ten arc-shaped nebulae containing centrally located
stars as candidate bowshocks. New spectroscopic observations of five stars show
that all are... | 0912.1314v1 |
2010-01-27 | Mass-radius relationships for exoplanets | For planets other than Earth, interpretation of the composition and structure
depends largely on comparing the mass and radius with the composition expected
given their distance from the parent star. The composition implies a
mass-radius relation which relies heavily on equations of state calculated from
electronic str... | 1001.4851v3 |
2010-02-09 | The ACS Nearby Galaxy Survey Treasury V. Radial Star Formation History of NGC 300 | We present new Hubble Space Telescope (HST) observations of NGC 300 taken as
part of the ACS Nearby Galaxy Survey Treasury (ANGST). Individual stars are
resolved in these images down to an absolute magnitude of M_F814W = 1.0 (below
the red clump). We determine the star formation history of the galaxy in 6
radial bins b... | 1002.1743v1 |
2010-04-28 | The ACS Nearby Galaxy Survey Treasury VI. The Ancient Star Forming disk of NGC 404 | We present HST/WFPC2 observations across the disk of the nearby isolated
dwarf S0 galaxy NGC 404, which hosts an extended gas disk. Our deepest field
reaches the red clump and main-sequence stars with ages <500 Myr. Although we
detect trace amounts of star formation at times more recent than 10 Gyr for all
fields, the ... | 1004.5135v1 |
2010-06-13 | The 21 cm Signature of Cosmic String Wakes | We discuss the signature of a cosmic string wake in 21cm redshift surveys.
Since 21cm surveys probe higher redshifts than optical large-scale structure
surveys, the signatures of cosmic strings are more manifest in 21cm maps than
they are in optical galaxy surveys. We find that, provided the tension of the
cosmic strin... | 1006.2514v3 |
2010-09-23 | The ACS Nearby Galaxy Survey Treasury IX. Constraining asymptotic giant branch evolution with old metal-poor galaxies | In an attempt to constrain evolutionary models of the asymptotic giant branch
(AGB) phase at the limit of low masses and low metallicities, we have examined
the luminosity functions and number ratio between AGB and red giant branch
(RGB) stars from a sample of resolved galaxies from the ACS Nearby Galaxy
Survey Treasur... | 1009.4618v1 |
2010-11-08 | Least Squares Ranking on Graphs | Given a set of alternatives to be ranked, and some pairwise comparison data,
ranking is a least squares computation on a graph. The vertices are the
alternatives, and the edge values comprise the comparison data. The basic idea
is very simple and old: come up with values on vertices such that their
differences match th... | 1011.1716v4 |
2010-12-20 | Integrable embeddings and foliations | A k-submanifold L of an open n-manifold M is called weakly integrable (WI)
[resp. strongly integrable (SI)] if there exists a submersion \Phi:M\to R^{n-k}
such that L\subset \Phi^{-1}(0) [resp. L= \Phi^{-1}(0)]. In this work we study
the following problem, first stated in a particular case by Costa et al.
(Invent. Math... | 1012.4312v1 |
2011-01-06 | How Typical Are The Local Group Dwarf Galaxies? | We compare the cumulative star formation histories (SFHs) of Local Group (LG)
dwarf galaxies with those in the volume-limited ACS Nearby Galaxy Survey
Treasury (ANGST) sample (D < 4 Mpc), in order to understand how typical the LG
dwarf galaxies are relative to those in the nearby universe. The SFHs were
derived in a un... | 1101.1301v2 |
2011-01-18 | HAT-P-27b: A hot Jupiter transiting a G star on a 3 day orbit | We report the discovery of HAT-P-27b, an exoplanet transiting the moderately
bright G8 dwarf star GSC 0333-00351 (V=12.214). The orbital period is 3.039586
+/- 0.000012 d, the reference epoch of transit is 2455186.01879 +/- 0.00054
(BJD), and the transit duration is 0.0705 +/- 0.0019 d. The host star with its
effective... | 1101.3511v2 |
2011-03-31 | The ACS Nearby Galaxy Survey Treasury VII. The NGC 4214 Starburst and the Effects of Star Formation History on Dwarf Morphology | We present deep Hubble Space Telescope Wide Field Planetary Camera 2 (WFPC2)
optical observations obtained as part of the ACS Nearby Galaxy Survey Treasury
(ANGST) as well as early release Wide Field Camera 3 (WFC3) ultra-violet and
infrared observations of the nearby dwarf starbursting galaxy NGC 4214. Our
data provid... | 1104.0033v1 |
2011-05-10 | The Higgs Potential in the Type II Seesaw Model | We perform in the type II seesaw setting, a detailed study of the dynamical
features of the corresponding general renormalizable doublet/triplet Higgs
potential that depends on five dimensionless couplings and two mass parameters
after spontaneous symmetry breaking, and highlight the implications for the
Higgs phenomen... | 1105.1925v2 |
2011-06-17 | The Luminosity Profile and Structural Parameters of the Andromeda Galaxy | We have constructed an extended composite luminosity profile for the
Andromeda galaxy, M31, and have decomposed it into three basic luminous
structural components: a bulge, a disk and a halo. The dust-free Spitzer/IRAC
imaging and extended spatial coverage of ground-based optical imaging and deep
star counts allow us t... | 1106.3564v1 |
2011-08-24 | The Canada-France Ecliptic Plane Survey - Full Data Release: The orbital structure of the Kuiper belt | We report the orbital distribution of the trans-neptunian objects (TNOs)
discovered during the Canada-France Ecliptic Plane Survey, whose discovery
phase ran from early 2003 until early 2007. The follow-up observations started
just after the first discoveries and extended until late 2009. We obtained
characterized obse... | 1108.4836v1 |
2011-09-09 | LSPM J1112+7626: detection of a 41-day M-dwarf eclipsing binary from the MEarth transit survey | We report the detection of eclipses in LSPM J1112+7626, which we find to be a
moderately bright (I_C = 12.14 +/- 0.05) very low-mass binary system with an
orbital period of 41.03236 +/- 0.00002 days, and component masses M_1 = 0.395
+/- 0.002 Msol and M_2 = 0.275 +/- 0.001 Msol in an eccentric (e = 0.239 +/-
0.002) orb... | 1109.2055v1 |
2011-09-15 | Kepler-16: A Transiting Circumbinary Planet | We report the detection of a planet whose orbit surrounds a pair of low-mass
stars. Data from the Kepler spacecraft reveal transits of the planet across
both stars, in addition to the mutual eclipses of the stars, giving precise
constraints on the absolute dimensions of all three bodies. The planet is
comparable to Sat... | 1109.3432v1 |
2011-09-30 | Resolved Near-Infrared Stellar Populations in Nearby Galaxies | We present near-infrared (NIR) color-magnitude diagrams (CMDs) for the
resolved stellar populations within 26 fields of 23 nearby galaxies (<4 Mpc),
based on F110W and F160W images from Wide Field Camera 3 (WFC3) on the Hubble
Space Telescope (HST). The CMDs sample both old dormant and young star-forming
populations. W... | 1109.6893v1 |
2011-10-13 | The First Stray Light Corrected EUV Images of Solar Coronal Holes | Coronal holes are the source regions of the fast solar wind, which fills most
of the solar system volume near the cycle minimum. Removing stray light from
extreme ultraviolet (EUV) images of the Sun's corona is of high astrophysical
importance, as it is required to make meaningful determinations of temperatures
and den... | 1110.3052v2 |
2011-10-26 | Qatar-2: A K dwarf orbited by a transiting hot Jupiter and a more massive companion in an outer orbit | We report the discovery and initial characterization of Qatar-2b, a hot
Jupiter transiting a V = 13.3 mag K dwarf in a circular orbit with a short
period, P_ b = 1.34 days. The mass and radius of Qatar-2b are M_p = 2.49 M_j
and R_p = 1.14 R_j, respectively. Radial-velocity monitoring of Qatar-2 over a
span of 153 days ... | 1110.5912v1 |
2011-11-01 | Cosmological evolution of warm dark matter fluctuations I: Efficient computational framework with Volterra integral equations | We study the complete cosmological evolution of dark matter (DM) density
fluctuations for DM particles that decoupled being ultrarelativistic during the
radiation dominated era which is the case of keV scale warm DM (WDM). The new
framework presented here can be applied to other types of DM and in particular
we extend ... | 1111.0290v2 |
2011-12-06 | Towards resolution of the Fermi surface in underdoped high-Tc superconductors | We survey recent experimental results including quantum oscillations and
complementary measurements probing the electronic structure of underdoped
cuprates, and theoretical proposals to explain them. We discuss quantum
oscillations measured at high magnetic fields in the underdoped cuprates that
reveal a small Fermi su... | 1112.1373v2 |
2012-01-23 | The Star Formation History of Leo T from Hubble Space Telescope Imaging | We present the star formation history (SFH) of the faintest known
star-forming galaxy, Leo T, based on imaging taken with the Hubble Space
Telescope (HST) Wide Field Planetary Camera 2 (WFPC2). The HST/WFPC2
color-magnitude diagram (CMD) of Leo T is exquisitely deep, extending ~ 2
magnitudes below the oldest main seque... | 1201.4859v1 |
2012-02-13 | Internal Stellar Kinematics of M32 from the SPLASH Survey: Dark Halo Constraints and the Formation of Compact Elliptical Galaxies | As part of the SPLASH survey of the Andromeda galaxy (M31) and its neighbors,
we have obtained Keck/DEIMOS spectra of the compact elliptical (cE) satellite
M32. This is the first resolved-star kinematical study of any cE galaxy. In
contrast to previous studies that extended out to r<30"~1Re~100pc, we measure
the rotati... | 1202.2897v3 |
2012-04-19 | The SPLASH Survey: Kinematics of Andromeda's Inner Spheroid | The combination of large size, high stellar density, high metallicity, and
Sersic surface brightness profile of the spheroidal component of the Andromeda
galaxy (M31) within R_proj ~ 20 kpc suggest that it is unlike any subcomponent
of the Milky Way. In this work we capitalize on our proximity to and external
view of M... | 1204.4455v1 |
2012-06-07 | KELT-1b: A Strongly Irradiated, Highly Inflated, Short Period, 27 Jupiter-mass Companion Transiting a mid-F Star | We present the discovery of KELT-1b, the first transiting low-mass companion
from the wide-field Kilodegree Extremely Little Telescope-North (KELT-North)
survey. The V=10.7 primary is a mildly evolved, solar-metallicity, mid-F star.
The companion is a low-mass brown dwarf or super-massive planet with mass of
27.23+/-0.... | 1206.1635v1 |
2012-06-12 | A spectroscopic survey of Andromeda's Western Shelf | The Andromeda galaxy (M31) shows many tidal features in its halo, including
the Giant Southern Stream (GSS) and a sharp ledge in surface density on its
western side (the W Shelf). Using DEIMOS on the Keck telescope, we obtain
radial velocities of M31's giant stars along its NW minor axis, in a radial
range covering the... | 1206.2619v1 |
2012-09-10 | Stellar Kinematics of the Andromeda II Dwarf Spheroidal Galaxy | We present kinematical profiles and metallicity for the M31 dwarf spheroidal
(dSph) satellite galaxy Andromeda II (And II) based on Keck DEIMOS spectroscopy
of 531 red giant branch stars. Our kinematical sample is among the largest for
any M31 satellite and extends out to two effective radii (r_eff = 5.3' = 1.1
kpc). W... | 1209.2116v1 |
2012-09-11 | The Panchromatic Hubble Andromeda Treasury II. Tracing the Inner M31 Halo with Blue Horizontal Branch Stars | We attempt to constrain the shape of M31's inner stellar halo by tracing the
surface density of blue horizontal branch (BHB) stars at galactocentric
distances ranging from 2 kpc to 35 kpc. Our measurements make use of resolved
stellar photometry from a section of the Panchromatic Hubble Andromeda Treasury
(PHAT) survey... | 1209.2416v1 |
2012-10-23 | Supernova Remnant Progenitor Masses in M31 | Using HST photometry, we age-date 59 supernova remnants (SNRs) in the spiral
galaxy M31 and use these ages to estimate zero-age main sequence masses (MZAMS)
for their progenitors. To accomplish this, we create color-magnitude diagrams
(CMDs) and use CMD fitting to measure the recent star formation history (SFH)
of the ... | 1210.6353v1 |
2012-11-02 | Sketched SVD: Recovering Spectral Features from Compressive Measurements | We consider a streaming data model in which n sensors observe individual
streams of data, presented in a turnstile model. Our goal is to analyze the
singular value decomposition (SVD) of the matrix of data defined implicitly by
the stream of updates. Each column i of the data matrix is given by the stream
of updates se... | 1211.0361v1 |
2012-11-05 | KELT-3b: A Hot Jupiter Transiting a V=9.8 Late-F Star | We report the discovery of KELT-3b, a moderately inflated transiting hot
Jupiter with a mass of 1.477 (-0.067, +0.066) M_J, and radius of 1.345 +/-
0.072 R_J, with an orbital period of 2.7033904 +/- 0.000010 days. The host
star, KELT-3, is a V=9.8 late F star with M_* = 1.278 (-0.061, +0.063) M_sun,
R_* = 1.472 (-0.067... | 1211.1031v2 |
2013-01-16 | Mandated data archiving greatly improves access to research data | The data underlying scientific papers should be accessible to researchers
both now and in the future, but how best can we ensure that these data are
available? Here we examine the effectiveness of four approaches to data
archiving: no stated archiving policy, recommending (but not requiring)
archiving, and two versions... | 1301.3744v1 |
2013-01-25 | Multi-site campaign for transit timing variations of WASP-12 b: possible detection of a long-period signal of planetary origin | The transiting planet WASP-12 b was identified as a potential target for
transit timing studies because a departure from a linear ephemeris was reported
in the literature. Such deviations could be caused by an additional planet in
the system. We attempt to confirm the existence of claimed variations in
transit timing a... | 1301.5976v1 |
2013-03-20 | Genomic Sequence Diversity and Population Structure of Saccharomyces cerevisiae Assessed by RAD-seq | The budding yeast Saccharomyces cerevisiae is important for human food
production and as a model organism for biological research. The genetic
diversity contained in the global population of yeast strains represents a
valuable resource for a number of fields, including genetics, bioengineering,
and studies of evolution... | 1303.4835v1 |
2013-04-02 | Modeling Multi-Magnet Networks Interacting Via Spin Currents | The significant experimental advances of the last few decades in dealing with
the interaction of spin currents and nanomagnets, at the device level, has
allowed envisioning a broad class of devices that propose to implement
information processing using spin currents and nanomagnets. To analyze such
spin-magnet logic ci... | 1304.0742v3 |
2013-04-03 | A Novel Frank-Wolfe Algorithm. Analysis and Applications to Large-Scale SVM Training | Recently, there has been a renewed interest in the machine learning community
for variants of a sparse greedy approximation procedure for concave
optimization known as {the Frank-Wolfe (FW) method}. In particular, this
procedure has been successfully applied to train large-scale instances of
non-linear Support Vector M... | 1304.1014v2 |
2013-07-10 | Hard X-ray and ultraviolet emission during the 2011 June 7 solar flare | The relationship between X-ray and UV emission during flares, particularly in
the context of quasi-periodic pulsations, remains unclear. To address this, we
study the impulsive X-ray and UV emission during the eruptive flare of 2011
June 7 utilising X-ray imaging from RHESSI and UV 1700A imaging from SDO/AIA.
This even... | 1307.2874v2 |
2013-07-11 | Inferring the Andromeda Galaxy's mass from its giant southern stream with Bayesian simulation sampling | M31 has a giant stream of stars extending far to the south and a great deal
of other tidal debris in its halo, much of which is thought to be directly
associated with the southern stream. We model this structure by means of
Bayesian sampling of parameter space, where each sample uses an N-body
simulation of a satellite... | 1307.3219v1 |
2013-07-31 | Learning about SANS Instruments and Data Reduction from Round Robin Measurements on Samples of Polystyrene Latex | Measurements of a well-characterised standard sample can verify the
performance of an instrument. Typically, small-angle neutron scattering
instruments are used to investigate a wide range of samples and may often be
used in a number of configurations. Appropriate standard samples are useful to
test different aspects o... | 1307.8296v1 |
2013-08-09 | A Search for RR Lyrae Stars in Segue 2 and Segue 3 | We present an extensive search for RR Lyrae stars in and around the
ultra-faint Milky Way companions Segue 2 and Segue 3. The former (M_V = -2.5,
Belokurov et al. 2009) appears to be an extremely faint dwarf galaxy companion
of the Milky Way. The latter (M_V = 0.0, Fadely et al. 2011) is among the
faintest star cluster... | 1308.2227v1 |
2013-10-15 | A New Approach to Detailed Structural Decomposition from the SPLASH and PHAT Surveys: Kicked-up Disk Stars in the Andromeda Galaxy? | We characterize the bulge, disk, and halo subcomponents in the Andromeda
galaxy (M31) over the radial range 4 < R_proj < 225 kpc. The cospatial nature
of these subcomponents renders them difficult to disentangle using surface
brightness (SB) information alone, especially interior to ~20 kpc. Our new
decomposition techn... | 1310.4179v1 |
2013-12-11 | The Nosoi commute: a spatial perspective on the rise of BSL-4 laboratories in cities | Recent H5N1 influenza research has revived the debate on the storage and
manipulation of potentially harmful pathogens. In the last two decades, new
high biosafety (BSL-4) laboratories entered into operation, raising strong
concerns from the public. The probability of an accidental release of a
pathogen from a BSL-4 la... | 1312.3283v2 |
2013-12-18 | The thermal Sunyaev Zel'dovich effect power spectrum in light of Planck | (Abridged) The amplitude of the thermal Sunyaev Zel'dovich effect (tSZ) power
spectrum is extremely sensitive to the abundance of galaxy clusters and
therefore to fundamental cosmological parameters that control their growth,
such as sigma_8 and Omega_m. Here we explore the sensitivity of the tSZ power
spectrum to impo... | 1312.5341v2 |
2014-02-21 | How to Scale Exponential Backoff | Randomized exponential backoff is a widely deployed technique for
coordinating access to a shared resource. A good backoff protocol should,
arguably, satisfy three natural properties: (i) it should provide constant
throughput, wasting as little time as possible; (ii) it should require few
failed access attempts, minimi... | 1402.5207v4 |
2014-04-10 | The Spitzer South Pole Telescope Deep Field Survey: Linking galaxies and halos at z=1.5 | We present an analysis of the clustering of high-redshift galaxies in the
recently completed 94 deg$^2$ Spitzer-SPT Deep Field survey. Applying flux and
color cuts to the mid-infrared photometry efficiently selects galaxies at
$z\sim1.5$ in the stellar mass range $10^{10}-10^{11}M_\odot$, making this
sample the largest... | 1404.2930v2 |
2014-04-28 | The Star Formation Histories of Local Group Dwarf Galaxies I. Hubble Space Telescope / Wide Field Planetary Camera 2 Observations | We present uniformly measured star formation histories (SFHs) of 40 Local
Group dwarf galaxies based on color-magnitude diagram (CMD) analysis from
archival Hubble Space Telescope imaging. We demonstrate that accurate SFHs can
be recovered from CMDs that do not reach the oldest main sequence turn-off
(MSTO), but emphas... | 1404.7144v1 |
2014-06-26 | Spin Supercurrent, Magnetization Dynamics, and Phi-State in Spin-Textured Josephson Junctions | The prospect of combining the dissipationless nature of superconducting
currents with the spin-polarization of magnetic materials is interesting with
respect to exploring superconducting analogues of topics in spintronics. In
order to accomplish this aim, it is pivotal to understand how
spin-supercurrents interact dyna... | 1406.7016v1 |
2014-07-11 | Digital frequency domain multiplexing readout electronics for the next generation of millimeter telescopes | Frequency domain multiplexing (fMux) is an established technique for the
readout of transition-edge sensor (TES) bolometers in millimeter-wavelength
astrophysical instrumentation. In fMux, the signals from multiple detectors are
read out on a single pair of wires reducing the total cryogenic thermal loading
as well as ... | 1407.3161v1 |
2014-08-03 | Bounded Real Lemma and structured singular value versus diagonal scaling: the free noncommutative setting | The structured singular value $\mu$ was introduced independently by Doyle and
Safanov as a tool for analyzing robustness of system stability and performance
in the presence of structured uncertainty in the system parameters. While the
structured singular value provides a necessary and sufficient criterion for
robustnes... | 1408.0519v1 |
2014-09-02 | The Panchromatic Hubble Andromeda Treasury X. Ultraviolet to Infrared Photometry of 117 Million Equidistant Stars | We have measured stellar photometry with the Hubble Space Telescope (HST)
Wide Field Camera 3 (WFC3) and Advanced Camera for Surveys (ACS) in near
ultraviolet (F275W, F336W), optical (F475W, F814W), and near infrared (F110W,
F160W) bands for 117 million resolved stars in M31. As part of the Panchromatic
Hubble Andromed... | 1409.0899v1 |
2014-09-30 | The Supernova Progenitor Mass Distributions of M31 and M33: Further Evidence for an Upper Mass Limit | Using Hubble Space Telescope (HST) photometry to measure star formation
histories, we age-date the stellar populations surrounding supernova remnants
(SNRs) in M31 and M33. We then apply stellar evolution models to the ages to
infer the corresponding masses for their supernova progenitor stars. We analyze
33 M33 SNR pr... | 1410.0018v1 |
2014-10-17 | Ferromagnetic resonance in $ε$-Co magnetic composites | We investigate the electromagnetic properties of assemblies of nanoscale
$\epsilon$-cobalt crystals with size range between 5 nm to 35 nm, embedded in a
polystyrene (PS) matrix, at microwave (1-12 GHz) frequencies. We investigate
the samples by transmission electron microscopy (TEM) imaging, demonstrating
that the part... | 1410.4789v2 |
2014-12-28 | The structure of solar radio noise storms | The Nan\c{c}ay Radioheliograph (NRH) routinely produces snapshot images of
the full sun at frequencies between 150 and 450 MHz, with typical resolution 3
arcmin and time cadence 0.2 s. Combining visibilities from the NRH and from the
Giant Meterwave Radio Telescope (GMRT) allows us to produce images of the sun
at 236 o... | 1412.8189v2 |
2014-12-28 | Hopf Algebras and Markov Chains | This thesis introduces a way to build Markov chains out of Hopf algebras. The
transition matrix of a "Hopf-power Markov chain" is (the transpose of) the
matrix of the coproduct-then-product operator on a combinatorial Hopf algebra
with respect to a suitable basis. These chains describe the
breaking-then-recombining of ... | 1412.8221v2 |
2015-01-22 | KELT-7b: A hot Jupiter transiting a bright V=8.54 rapidly rotating F-star | We report the discovery of KELT-7b, a transiting hot Jupiter with a mass of
$1.28 \pm 0.18$ MJ, radius of $1.53_{-0.047}^{+0.046}$ RJ, and an orbital
period of $2.7347749 \pm 0.0000039$ days. The bright host star (HD33643;
KELT-7) is an F-star with $V=8.54$, Teff $=6789_{-49}^{+50}$ K, [Fe/H]
$=0.139_{-0.081}^{+0.075}$... | 1501.05565v2 |
2015-01-27 | Tracing the Metal-Poor M31 Stellar Halo with Blue Horizontal Branch Stars | We have analyzed new HST/ACS and HST/WFC3 imaging in F475W and F814W of two
previously-unobserved fields along the M31 minor axis to confirm our previous
constraints on the shape of M31's inner stellar halo. Both of these new
datasets reach a depth of at least F814W$<$27 and clearly detect the blue
horizontal branch (B... | 1501.06631v1 |
2015-02-12 | A clear age-velocity dispersion correlation in Andromeda's stellar disk | The stellar kinematics of galactic disks are key to constraining disk
formation and evolution processes. In this paper, for the first time, we
measure the stellar age-velocity dispersion correlation in the inner 20 kpc
(3.5 disk scale lengths) of M31 and show that it is dramatically different from
that in the Milky Way... | 1502.03820v1 |
2015-03-17 | The Star Formation Histories of Local Group Dwarf Galaxies III. Characterizing Quenching in Low-Mass Galaxies | We explore the quenching of low-mass galaxies (10^4 < Mstar < 10^8 Msun) as a
function of lookback time using the star formation histories (SFHs) of 38 Local
Group dwarf galaxies. The SFHs were derived from analyzing color-magnitude
diagrams of resolved stellar populations in archival Hubble Space
Telescope/Wide Field ... | 1503.05195v1 |
2015-04-28 | Nearly Optimal Deterministic Algorithm for Sparse Walsh-Hadamard Transform | For every fixed constant $\alpha > 0$, we design an algorithm for computing
the $k$-sparse Walsh-Hadamard transform of an $N$-dimensional vector $x \in
\mathbb{R}^N$ in time $k^{1+\alpha} (\log N)^{O(1)}$. Specifically, the
algorithm is given query access to $x$ and computes a $k$-sparse $\tilde{x} \in
\mathbb{R}^N$ sa... | 1504.07648v1 |
2015-06-26 | Modeling and Simulation of Spin Transfer Torque Generated at Topological Insulator/Ferromagnetic Heterostructure | Topological Insulator (TI) has recently emerged as an attractive candidate
for possible application to spintronic circuits because of its strong spin
orbit coupling. TIs are unique materials that have an insulating bulk but
conducting surface states due to band inversion and these surface states are
protected by time r... | 1506.07932v2 |
2015-07-23 | A Spectroscopic and Photometric Exploration of the C/M Ratio in the Disk of M31 | We explore the ratio (C/M) of carbon-rich to oxygen-rich thermally pulsing
asymptotic giant branch(TP-AGB) stars in the disk of M31 using a combination of
moderate-resolution optical spectroscopy from the Spectroscopic Landscape of
Andromeda's Stellar Halo (SPLASH) survey and six-filter Hubble Space Telescope
photometr... | 1507.06687v1 |
2015-07-24 | Discovery and Validation of Kepler-452b: A 1.6-Re Super Earth Exoplanet in the Habitable Zone of a G2 Star | We report on the discovery and validation of Kepler-452b, a transiting planet
identified by a search through the 4 years of data collected by NASA's Kepler
Mission. This possibly rocky 1.63$^{+0.23}_{-0.20}$ R$_\oplus$ planet orbits
its G2 host star every 384.843$^{+0.007}_{0.012}$ days, the longest orbital
period for ... | 1507.06723v1 |
2015-08-02 | Optimal Radio Frequency Energy Harvesting with Limited Energy Arrival Knowledge | In this paper, we develop optimal policies for deciding when a wireless node
with radio frequency (RF) energy harvesting (EH) capabilities should try and
harvest ambient RF energy. While the idea of RF-EH is appealing, it is not
always beneficial to attempt to harvest energy; in environments where the
ambient energy is... | 1508.00285v1 |
2015-09-22 | The Panchromatic Hubble Andromeda Treasury VIII: A Wide-Area, High-Resolution Map of Dust Extinction in M31 | We map the distribution of dust in M31 at 25pc resolution, using stellar
photometry from the Panchromatic Hubble Andromeda Treasury. We develop a new
mapping technique that models the NIR color-magnitude diagram (CMD) of red
giant branch (RGB) stars. The model CMDs combine an unreddened foreground of
RGB stars with a r... | 1509.06988v1 |
2016-01-07 | Detection of lensing substructure using ALMA observations of the dusty galaxy SDP.81 | We study the abundance of substructure in the matter density near galaxies
using ALMA Science Verification observations of the strong lensing system
SDP.81. We present a method to measure the abundance of subhalos around
galaxies using interferometric observations of gravitational lenses. Using
simulated ALMA observati... | 1601.01388v1 |
2016-02-09 | Isotropic at the Break? 3D Kinematics of Milky Way Halo Stars in the Foreground of M31 | We present the line-of-sight (LOS) velocities for 13 distant main sequence
Milky Way halo stars with published proper motions. The proper motions were
measured using long baseline (5-7 years) multi-epoch HST/ACS photometry, and
the LOS velocities were extracted from deep (5-6 hour integrations) Keck
II/DEIMOS spectra. ... | 1602.03180v1 |
2016-06-22 | Qatar Exoplanet Survey : Qatar-3b, Qatar-4b and Qatar-5b | We report the discovery of Qatar-3b, Qatar-4b, and Qatar-5b, three new
transiting planets identified by the Qatar Exoplanet Survey (QES). The three
planets belong to the hot Jupiter family, with orbital periods of
$P_{Q3b}$=2.50792 days, $P_{Q4b}$=1.80539 days, and $P_{Q5b}$=2.87923 days.
Follow-up spectroscopic observ... | 1606.06882v5 |
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