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The Type IIn Supernova 2002kg: The Outburst of a Luminous Blue Variable
Star in NGC 2403: We show that Supernova (SN) 2002kg in NGC 2403, initially classified as Type
II-narrow (IIn), has photometric and spectroscopic properties unlike those of
normal SNe. Its behavior, instead, is more typical of highly massive star... | astro-ph |
The Distribution of Thermal Pressures in the Interstellar Medium from a
Survey of C I Fine-Structure Excitation: We used the smallest entrance aperture (0.03 arc-sec wide slit) and highest
resolution echelle gratings (E140H and E230H) of STIS on HST to record the
interstellar absorption features for 10 different mult... | astro-ph |
Determining Star Formation Rates for Infrared Galaxies: We show that measures of star formation rates (SFRs) for infrared galaxies
using either single-band 24 um or extinction-corrected Paschen-alpha
luminosities are consistent in the total infrared luminosity = L(TIR) ~ 10^10
L_sun range. MIPS 24 micron photometry can... | astro-ph |
Measuring M31 globular cluster ages and metallicities using both
photometry and spectroscopy: The ages and metallicities of globular clusters play an important role not
just in testing models for their formation and evolution but in understanding
the assembly history for their host galaxies. Here we use a combination... | astro-ph |
Light curve analysis of ordinary type IIP supernovae based on
neutrino-driven explosion simulations in three dimensions: Type II-plateau supernovae (SNe IIP) are the most numerous subclass of
core-collapse SNe originating from massive stars. In the framework of the
neutrino-driven explosion mechanism, we study the SN... | astro-ph |
Advection-Dominated Accretion Model of Sagittarius A$^*$ and Other
Accreting Black Holes: Viscous rotating accretion flows around black holes become
advection-dominated when the accretion rate $\dot M$ is sufficiently low. Most
of the accretion energy in such flows is stored within the gas and advected
radially inwar... | astro-ph |
A solar-cycle study of coronal rotation: large variations, rapid
changes, and implications for solar wind models: Information on the rotation rate of the corona, and its variation over
latitude and solar cycle, is valuable for making global connections between the
corona and the Sun, for global estimates of reconnect... | astro-ph |
The drop of the coherence of the lower kHz QPOs is also observed in XTE
J1701-462: We investigate the quality factor and RMS amplitude of the lower kHz QPOs
from XTE J1701-462, a unique X-ray source which was observed in both the
so-called Z and atoll states. Correcting for the frequency drift of the QPO, we
show tha... | astro-ph |
The G305 star-forming complex: radio continuum and molecular line
observations: We present 109-115 GHz (3 mm) wide-field spectral line observations of 12^CO,
13^CO and C^18O J=1-0 molecular emission and 5.5 and 8.8 GHz (6 and 3 cm) radio
continuum emission towards the high-mass star forming complex known as G305.
The... | astro-ph |
Every Flare, Everywhere: An All-Sky Untriggered Search for Astrophysical
Neutrino Transients Using IceCube Data: Recent results from IceCube regarding TXS 0506+056 suggest the presence of
neutrino flares that are not temporally coincident with a significant
corresponding gamma ray flare. Such flares are particularly ... | astro-ph |
Internal Dynamics of Globular Clusters: Galactic globular clusters, which are ancient building blocks of our Galaxy,
represent a very interesting family of stellar systems in which some
fundamental dynamical processes have taken place on time scales shorter than
the age of the universe. In contrast with galaxies, these... | astro-ph |
The Physics of Wind-Fed Accretion: We provide a brief review of the physical processes behind the radiative
driving of the winds of OB stars and the Bondi-Hoyle-Lyttleton capture and
accretion of a fraction of the stellar wind by a compact object, typically a
neutron star, in detached high-mass X-ray binaries (HMXBs). ... | astro-ph |
Clustering of 2PIGG galaxy groups with 2dFGRS galaxies: Prompted by indications from QSO lensing that there may be more mass
associated with galaxy groups than expected, we have made new dynamical infall
estimates of the masses associated with 2PIGG groups and clusters. We have
analysed the redshift distortions in the ... | astro-ph |
In-flight Calibration of Hitomi Soft X-ray Spectrometer (3) Effective
Area: We present the result of the in-flight calibration of the effective area of
the Soft X-ray Spectrometer (SXS) onboard the Hitomi X-ray satellite using an
observation of the Crab nebula. We corrected for the artifacts when observing
high count... | astro-ph |
Building protoplanetary disks from the molecular cloud: redefining the
disk timeline: We study the formation of the protoplanetary disk by the collapse of a
primordial molecular cloud, and how its evolution leads to the selection of
specific types of planets.
We use a hydrodynamical code that accounts for the dynam... | astro-ph |
Origin of Radially Aligned Magnetic Fields in Young Supernova Remnants: It has been suggested by radio observations of polarized synchrotron
emissions that downstream magnetic field in some young supernova remnants are
oriented radially. We study magnetic field distribution of turbulent supernova
remnant driven by the ... | astro-ph |
Subaru HSC weak lensing of SDSS redMaPPer cluster satellite galaxies:
Empirical upper limit on orphan fractions: Weak gravitational lensing directly probes the matter distribution
surrounding satellite galaxies in galaxy clusters. We measure the weak lensing
signal induced on the shapes of background galaxies around ... | astro-ph |
Time-resolved multiwavelength observations of the blazar VER J0521+211
from radio to gamma-ray energies: VER J0521+211 (RGB J0521.8+2112) is one of the brightest and most powerful
blazars detected in the TeV gamma-ray regime. It is located at a redshift of
z=0.108 and since its discovery in 2009, VER J0521+211 has ex... | astro-ph |
Reconstruction of Supernova Gravitational Waves Waveforms: Comparing
Three Time-frequency Transform Methods: For supernovae gravitational wave signal analysis which intend to reconstruct
supernova gravitational waves waveforms, we compare the performance of
short-time Fourier transform (STFT), the synchroextracting t... | astro-ph |
Massive Star Cluster Formation and Destruction in Luminous Infrared
Galaxies in GOALS II: An ACS/WFC3 Survey of Nearby LIRGs: We present the results of a Hubble Space Telescope WFC3 near-UV and ACS/WFC
optical study into the star cluster populations of 10 luminous and
ultra-luminous infrared galaxies (U/LIRGs) in the... | astro-ph |
Observations, Thermochemical Calculations, and Modeling of Exoplanetary
Atmospheres: This dissertation as a whole aims to provide means to better understand
hot-Jupiter planets through observing, performing thermochemical calculations,
and modeling their atmospheres. We used Spitzer multi-wavelength
secondary-eclipse... | astro-ph |
The Attenuation of Gamma-Ray Emission in Strongly-Magnetized Pulsars: Gamma-rays from pulsars can be efficiently attenuated in their magnetospheres
via the mechanism of single-photon pair production and also the exotic QED
process of photon splitting, which become prolific in fields approaching the
quantum critical val... | astro-ph |
The DIVING$^{3D}$ Survey -- Deep IFS View of Nuclei of Galaxies -- I.
Definition and Sample Presentation: We present the Deep Integral Field Spectrograph View of Nuclei of Galaxies
(DIVING$^{3D}$) survey, a seeing-limited optical 3D spectroscopy study of the
central regions of all 170 galaxies in the Southern hemisph... | astro-ph |
The Fluorescence Detector of the Pierre Auger Observatory - A
Calorimeter for UHECR: The Pierre Auger Observatory is a hybrid detector for ultrahigh energy cosmic
rays (UHECR) with energies above 10$^{18.5}$ eV. Currently the first part of
the Observatory nears completion in the southern hemisphere in Argentina. One
... | astro-ph |
High Redshift Radio Galaxies: Laboratories for Massive Galaxy and
Cluster Formation in the early Universe: High redshift radio galaxies are among the largest, most luminous, most
massive, and most beautiful objects in the Universe. They are generally
identified from their radio emission, thought to be powered by accr... | astro-ph |
Fractional amplitude of kilohertz quasi-periodic oscillation from 4U
1728-34: evidence of decline at higher energies: A kilohertz quasi-periodic oscillation (kHz QPO) is an observationally robust
high-frequency timing feature detected from neutron star low-mass X-ray
binaries (LMXBs). This feature can be very useful ... | astro-ph |
Variations in the slope of the resolved star-forming main sequence: a
tool for constraining the mass of star-forming regions: The correlation between galaxies' integrated stellar masses and star
formation rates (the `star formation main sequence'; SFMS) is a
well-established scaling relation. Recently, surveys have f... | astro-ph |
The Mopra Southern Galactic Plane CO Survey - Data Release 3: We present observations of fifty square degrees of the Mopra carbon monoxide
(CO) survey of the Southern Galactic Plane, covering Galactic longitudes $l =
300$-$350^\circ$ and latitudes $|b| \le 0.5^\circ$. These data have been taken
at 0.6 arcminute spatial... | astro-ph |
Radio Properties of z>4 Optically-Selected Quasars: We report on two programs to address differential evolution between the
radio-loud and radio-quiet quasar populations at high (z>4) redshift. Both
programs entail studying the radio properties of optically-selected quasars.
First, we have observed 32 optically-selecte... | astro-ph |
Nuclear reactions in hot stellar matter and nuclear surface deformation: Cross-sections for capture reactions of charged particles in hot stellar
matter turn out be increased by the quadrupole surface oscillations, if the
corresponding phonon energies are of the order of the star temperature. The
increase is studied in... | astro-ph |
Recent developments in Laue lens manufacturing and their impact on
imaging performance: We report on recent progress in the development of Laue lenses for
applications in hard X/soft gamma-ray astronomy. Here we focus on the
realization of a sector of such a lens made of 11 bent Germanium crystals and
describe the te... | astro-ph |
Neutrino-heated winds from millisecond proto-magnetars as sources of the
weak r-process: We explore heavy element nucleosynthesis in neutrino-driven winds from
rapidly-rotating, strongly magnetized proto-neutron stars for which the
magnetic dipole is aligned with the rotation axis, and the field is assumed to
be a st... | astro-ph |
IGR J17329-2731: The birth of a symbiotic X-ray binary: We report on the results of the multiwavelength campaign carried out after
the discovery of the INTEGRAL transient IGR J17329-2731. The optical data
collected with the SOAR telescope allowed us to identify the donor star in this
system as a late M giant at a dista... | astro-ph |
Digging for the Truth: Photon Archeology with GLAST: Stecker, Malkan and Scully, have shown how ongoing deep surveys of galaxy
luminosity functions, spectral energy distributions and backwards evolution
models of star formation rates can be used to calculate the past history of
intergalactic photon densities for energi... | astro-ph |
Seasonal thaws under mid-to-low pressure atmospheres on Early Mars: Despite decades of scientific research on the subject, the climate of the
first 1.5 Gyr of Mars history has not been fully understood yet. Especially
challenging is the need to reconcile the presence of liquid water for extended
periods of time on the ... | astro-ph |
The Masses of Nuclear Black Holes in Luminous Elliptical Galaxies and
Implications for the Space Density of the Most Massive Black Holes: Black hole masses predicted from the Mbh-sigma relationship conflict with
those predicted from the Mbh-L relationship for the most luminous galaxies,
such as brightest cluster gala... | astro-ph |
Correlated timing and spectral behavior of 4U 1705-44: We follow the timing properties of the neutron star low-mass X-ray binary
system 4U 1705-44 in different spectral states, as monitored by the Rossi X-ray
Timing Explorer over about a month. We fit the power density spectra using
multiple Lorentzians. We show that t... | astro-ph |
Prospects for annihilating dark matter from M31 and M33 observations
with the Cherenkov Telescope Array: M31 and M33 are the closest spiral galaxies and the largest members (together
with the Milky Way) of the Local group, which makes them interesting targets
for indirect dark matter searches. In this paper, we prese... | astro-ph |
The Ratio of Helium- to Hydrogen-Atmosphere White Dwarfs: Direct
Evidence for Convective Mixing: We determine the ratio of helium- to hydrogen-atmosphere white dwarf stars as
a function of effective temperature from a model atmosphere analysis of the
infrared photometric data from the Two Micron All Sky Survey combin... | astro-ph |
Revisiting the Long-Period Transiting Planets from Kepler: Currently, we have only limited means to probe the presence of planets at
large orbital separations. Foreman-Mackey et al. searched for long-period
transiting planets in the Kepler light curves using an automated pipeline.
Here, we apply their pipeline, with mi... | astro-ph |
VLT-SINFONI integral field spectroscopy of low-z luminous and
ultraluminous infrared galaxies I. Atlas of the 2D gas structure: We present an atlas of a sample of local (U)LIRGs covering the luminosity
range log(L_IR/L_sun)=11.1-12.4. The atlas is based on near-infrared H and
K-band VLT-SINFONI IFS, and presents the ... | astro-ph |
Clusters of Galaxies as Standard Candles for Global Observational
Cosmology: As the largest gravitationally collapsed objects, and as objects with a
relatively low space density, clusters of galaxies offer one of the best sets
of standard candles for trying to measure basic cosmological parameters such as
the injecti... | astro-ph |
Large Observatory for x-ray Timing (LOFT-P): A Probe-classs Mission
Concept Study: LOFT-P is a concept for a NASA Astrophysics Probe-Class (<$1B) X-ray timing
mission, based on the LOFT concept originally proposed to ESAs M3 and M4 calls.
LOFT-P requires very large collecting area (>6 m^2, >10x RXTE), high time
resol... | astro-ph |
The relationship between Class I and Class II methanol masers at high
angular resolution: We have used the Australia Telescope Compact Array (ATCA) to make the first
high resolution observations of a large sample of class~I methanol masers in
the 95-GHz ($8_0$--$7_1$A$^+$) transition. The target sources consist of a
... | astro-ph |
NICER observations of the Crab pulsar glitch of 2017 November: Context: The Crab pulsar underwent its largest timing glitch on 2017 Nov 8.
The event was discovered at radio wavelengths, and was followed at soft X-ray
energies by observatories, such as XPNAV and NICER. aims: This work aims to
compare the glitch behavior... | astro-ph |
Dark matter in Draco and the Local Group: Implications for direct
detection experiments: We use a cosmological simulation of the Local Group to make quantitative and
speculative predictions for direct detection experiments. Cold dark matter
(CDM) halos form via a complex series of mergers, accretion events and violen... | astro-ph |
A Census from JWST of Extreme Emission Line Galaxies Spanning the Epoch
of Reionization in CEERS: We present a sample of 1165 extreme emission-line galaxies (EELGs) at 4<z<9
selected using James Webb Space Telescope (JWST) NIRCam photometry in the
Cosmic Evolution Early Release Science (CEERS) program. We use a simpl... | astro-ph |
Time-resolved spectroscopy of the peculiar Halpha variable Be star HD
76534: We present time-resolved spectroscopy of the Be star HD 76534, which was
observed to have an Halpha outburst in 1995, when the line went from
photospheric absorption to emission at a level of more than two times the
continuum within 2.5 hour... | astro-ph |
Intrinsic errors of the central galactic mass derived from rotation
curves under the influence of a weak non-axisymmetric potential: Rotation curves are often used to estimate the mass distribution of spiral
galaxies, assuming circular rotation of disks. However, non-circular motions
caused by a non-axisymmetric grav... | astro-ph |
3D Relativistic Magnetohydrodynamic Simulations of Magnetized
Spine-Sheath Relativistic Jets: Numerical simulations of weakly magnetized and strongly magnetized
relativistic jets embedded in a weakly magnetized and strongly magnetized
stationary or weakly relativistic (v = c/2) sheath have been performed. A
magnetic ... | astro-ph |
Extending the view of ArH+ chemistry in diffuse clouds: One of the surprises of the Herschel mission was the detection of ArH+
towards the Crab Nebula in emission and in absorption towards strong Galactic
background sources. Although these detections were limited to the first
quadrant of the Galaxy, the existing data s... | astro-ph |
Rotation curves of galaxies in GR: It has been suggested that the observed flat rotation curves of disk galaxies
can be a peculiar effect of General Relativity (GR) rather than evidence for
the presence of dark matter (DM) halos in Newtonian gravity. In Ciotti (2022)
the problem has been quantitatively addressed by usi... | astro-ph |
Hybrid magnetized stars within the Field Correlator Method: We present preliminary results of the study of intense magnetic fields
effects on hybrid stars. For the description of the hadronic phase, we use the
relativistic mean field approximation. For the quark matter phase, we employ
the Field Correlator Method forma... | astro-ph |
Comment on "Nonideal Fields Solve the Injection Problem in Relativistic
Reconnection": Recently, Sironi (PRL, 128, 145102; S22) reported the correlation between
particles accelerated into high energy and their crossings of regions with
electric field larger than magnetic field (E>B regions) in kinetic simulations
of ... | astro-ph |
The young, tight and low mass binary TWA22AB: a new calibrator for
evolutionary models ? Orbit, spectral types and temperatures determination: Tight binaries discovered in young, nearby associations, with known
distances, are ideal targets to provide dynamical mass measurements to test the
physics of evolutionary mod... | astro-ph |
The broad line region of narrow-line Seyfert 1 galaxies: We have analyzed new and archival IUE observations of narrow-line Seyfert 1
galaxies (NLS1) in order to revise the ultraviolet (UV) properties of this
sub-group of Active Galactic Nuclei (AGN). We have found broad wings in the
strongest UV emission lines, ruling ... | astro-ph |
On the nature of bulges in general and of box/peanut bulges in
particular. Input from $N$-body simulations: Objects designated as bulges in disc galaxies do not form a homogeneous
class. I distinguish three types. The classical bulges, whose properties are
similar to those of ellipticals and which form by collapse or... | astro-ph |
Detection of anisotropic galaxy assembly bias in BOSS DR12: We present evidence of anisotropic galaxy assembly bias in the Baryon
Oscillation Spectroscopic Survey Data Release 12 galaxy sample at a level
exceeding $5\sigma$. We use measurements of the line-of-sight velocity
dispersion $\sigma_\star$ and stellar mass $M... | astro-ph |
CorrSim: A Multiwavelength Timing Observation Simulator: Studying the rapid variability of many astronomical objects is key to
understanding the underlying processes at play. However, a combination of
limited telescope availability, viewing constraints, and the unpredictable
nature of many sources mean that obtaining d... | astro-ph |
Ground Calibration of Solar X-ray Monitor On-board Chandrayaan-2 Orbiter: Chandrayaan-2, the second Indian mission to the Moon, carries a spectrometer
called the Solar X-ray Monitor (XSM) to perform soft X-ray spectral
measurements of the Sun while a companion payload measures the fluorescence
emission from the Moon. T... | astro-ph |
An "Ultrasonic Image" of the Embryonic Universe: CMB Polarization Tests
of the Inflationary Paradigm: This chapter describes how the Cosmic Gravitational Wave Background induces a
specific type of CMB polarization and describes the first experiment dedicated
to testing this most-promising signature of inflation. This... | astro-ph |
Thermal instabilities in cooling galactic coronae: fuelling star
formation in galactic discs: We investigate the means by which cold gas can accrete onto Milky Way mass
galaxies from a hot corona of gas, using a new smoothed particle hydrodynamics
code, 'SPHS'. We find that the 'cold clumps' seen in many classic SPH
... | astro-ph |
Soft X-ray in-flight calibration of the ROSAT PSPC: We present an in-flight calibration of the ROSAT PSPC using the incident
spectra of the hot white dwarf HZ43 and the polar AM Her. We derive an absolute
flux calibration of the PSPC using the accurately known soft X-ray spectrum of
HZ43. Corrections to the PSPC respon... | astro-ph |
Detection of Potential Transit Signals in 17 Quarters of Kepler Data:
Results of the Final Kepler Mission Transiting Planet Search (DR25): We present results of the final Kepler Data Processing Pipeline search for
transiting planet signals in the full 17-quarter primary mission data set. The
search includes a total o... | astro-ph |
GRB 091127: The cooling break race on magnetic fuel: Using high-quality, broad-band afterglow data for GRB 091127, we investigate
the validity of the synchrotron fireball model for gamma-ray bursts, and infer
physical parameters of the ultra-relativistic outflow. We used multi-wavelength
follow-up observations obtained... | astro-ph |
VLT K-band spectroscopy of massive stars deeply embedded in IRAS sources
with UCHII colours: We have obtained high resolution (R = 10,000) K-band spectra of candidate
young massive stars deeply embedded in (ultra-) compact HII regions (UCHIIs).
In these clusters, three types of objects are identified. The first type ... | astro-ph |
The Host Galaxies of Fast-Ejecta Core-Collapse Supernovae: Spectra of broad-lined Type Ic supernovae (SN Ic-BL), the only kind of SN
observed at the locations of long-duration gamma-ray bursts (LGRBs), exhibit
wide features indicative of high ejecta velocities (~0.1c). We study the host
galaxies of a sample of 245 low-... | astro-ph |
A Radio Nebula Surrounding the Ultra-luminous X-ray Source in NGC 5408: New radio observations of the counterpart of the ultraluminous X-ray source
in NGC 5408 show for the first time that the radio emission is resolved with an
angular size of 1.5 to 2.0 arcseconds. This corresponds to a physical size of
35-46 pc, and ... | astro-ph |
The Age Dependent Luminosities of the Red Giant Branch Bump, Asymptotic
Giant Branch Bump, and Horizontal Branch Red Clump: Color-magnitude diagrams of globular clusters often exhibit a prominent
horizontal branch (HB) and may also show features such as the red giant branch
(RGB) bump and the asymptotic giant branch ... | astro-ph |
Optical observations of NEA 162173 (1999 JU3) during the 2011-2012
apparition: Near-Earth asteroid 162173 (1999 JU3) is a potential target of two asteroid
sample return missions, not only because of its accessibility but also because
of the first C-type asteroid for exploration missions. The lightcurve-related
physic... | astro-ph |
On the mean field dynamo with Hall effect: We study in the present paper how Hall effect modifies the quenching process
of the electromotive force (e.m.f.) in Mean Field Dynamo (MFD) theories. We
write down the evolution equations for the e.m.f. and for the large and small
scale magnetic helicity, treat Hall effect as ... | astro-ph |
Ultraviolet HST Observations of the Jet in M87: We present new ultraviolet photometry of the jet in M87 obtained from HST
WFPC2 imaging. We combine these ultraviolet data with previously published
photometry for the knots of the jet in radio, optical, and X-ray, and fit three
theoretical synchrotron models to the full ... | astro-ph |
Parametrized modified gravity constraints after Planck: We constrain $f(R)$ and chameleon-type modified gravity in the framework of
the Berstchinger-Zukin parametrization using the recent released Planck data,
including both CMB temperature power spectrum and lensing potential power
spectrum. Some other external data s... | astro-ph |
Hydrodynamics of Cloud Collisions in 2D: The Fate of Clouds in a
Multi-phase Medium: We have studied head-on collisions between equal-mass, mildly supersonic
(Mach number 1.5) HI clouds, in a standard Two-phase ISM (T_cl = 74 K, n_cl =
22 cm^-3, \chi = 100). We explore the role of various factors, including the
radia... | astro-ph |
A multi-wavelength analysis of Spitzer selected Coma Cluster galaxies:
star formation rates and masses: We present a thorough study of the specific star formation rates for MIPS
24um selected galaxies in the Coma cluster. We build galaxy spectral energy
distributions using optical (u',g',r',i',z'), Near-infrared (J,H... | astro-ph |
The extreme initial kinetic energy allowed by a collapsing turbulent
core: We present high-resolution hydrodynamical simulations aimed at following the
gravitational collapse of a gas core, in which a turbulent spectrum of velocity
is implemented only initially. We determine the maximal value of the ratio of
kinetic ... | astro-ph |
A Gaia astrometric view of the open clusters Pleiades, Praesepe and
Blanco 1: Context. Near open clusters as Pleiades, Praesepe and Blanco 1 have been
extensively studied due to their proximity to the Sun. The Gaia data brings the
opportunity to investigate these clusters, since it contains valuable
astrometric and p... | astro-ph |
Coronagraphic observations of Si X 1430 nm acquired by DKIST/Cryo-NIRSP
with methods for telluric absorption correction: We report commissioning observations of the Si X 1430 nm solar coronal line
observed coronagraphically with the Cryogenic Near-Infrared Spectropolarimeter
(Cryo-NIRSP) at the National Science Found... | astro-ph |
Foreground Mismodeling and the Point Source Explanation of the Fermi
Galactic Center Excess: The Fermi Large Area Telescope has observed an excess of ~GeV energy gamma
rays from the center of the Milky Way, which may arise from near-thermal dark
matter annihilation. Firmly establishing the dark matter origin for this... | astro-ph |
Discovery of low-metallicity stars in the central parsec of the Milky
Way: We present a metallicity analysis of 83 late-type giants within the central 1
pc of the Milky Way. K-band spectroscopy of these stars were obtained with the
medium-spectral resolution integral-field spectrograph NIFS on Gemini North
using lase... | astro-ph |
Radio and Gamma-Ray Constraints on the Emission Geometry and Birthplace
of PSR J2043+2740: We report on the first year of Fermi gamma-ray observations of pulsed
high-energy emission from the old PSR J2043+2740. The study of the gamma-ray
efficiency of such old pulsars gives us an insight into the evolution of
pulsars... | astro-ph |
Constraining Ultralight Axions with Galaxy Surveys: Ultralight axions and other bosons are dark matter candidates present in many
high energy physics theories beyond the Standard Model. In particular, the
string axiverse postulates the existence of up to $\mathcal{O}(100)$ light
scalar bosons constituting the dark sect... | astro-ph |
NGC5719/13: interacting spirals forming a counter-rotating stellar disc: (Context) When a galaxy acquires material from the outside, it is likely that
the resulting angular momentum of the accreted material is decoupled from that
of the pre-existing galaxy. The presence of stars counter-rotating with respect
to other s... | astro-ph |
Proposal: The Neural Network Telescope: A neural network mechanism that can compensate for poor optical quality was
recently discovered in a biological context. We propose that this mechanism can
and should be adopted for astronomical purposes. This would shift emphasis away
from the quality of the optical equipment to... | astro-ph |
A 2-hr binary period for the black hole transient MAXI J0637-430: We revisit various sets of published results from X-ray and optical studies
of the Galactic black hole (BH) candidate MAXI J0637-430, which went into
outburst in 2019. Combining the previously reported values of peak outburst
luminosity, best-fitting rad... | astro-ph |
Quadratic genetic modifications: a streamlined route to cosmological
simulations with controlled merger history: Recent work has studied the interplay between a galaxy's history and its
observable properties using "genetically modified" cosmological zoom
simulations. The approach systematically generates alternative ... | astro-ph |
GIARPS High-resolution Observations of T Tauri stars (GHOsT). IV.
Accretion properties of the Taurus-Auriga young association: In the framework of the GIARPS@TNG High-resolution Observations of T Tauri
stars (GHOsT) project, we study the accretion properties of 37 Classical T
Tauri Stars of the Taurus-Auriga star for... | astro-ph |
Automated Lensing Learner: Automated Strong Lensing Identification with
a Computer Vision Technique: Forthcoming surveys such as the Large Synoptic Survey Telescope (LSST) and
Euclid necessitate automatic and efficient identification methods of strong
lensing systems. We present a strong lensing identification approa... | astro-ph |
Of `Cocktail Parties' and Exoplanets: The characterisation of ever smaller and fainter extrasolar planets requires
an intricate understanding of one's data and the analysis techniques used.
Correcting the raw data at the 10^-4 level of accuracy in flux is one of the
central challenges. This can be difficult for instrum... | astro-ph |
Venus Observations at 40 and 90 GHz with CLASS: Using the Cosmology Large Angular Scale Surveyor, we measure the
disk-averaged absolute Venus brightness temperature to be 432.3 $\pm$ 2.8 K and
355.6 $\pm$ 1.3 K in the Q and W frequency bands centered at 38.8 and 93.7 GHz,
respectively. At both frequency bands, these ar... | astro-ph |
A Kiloparsec-Scale Binary Active Galactic Nucleus Confirmed by the
Expanded Very Large Array: We report the confirmation of a kpc-scale binary active galactic nucleus
(AGN) with high-resolution radio images from the Expanded Very Large Array
(EVLA). SDSS J150243.1+111557 is a double-peaked [O III] AGN at z = 0.39
sel... | astro-ph |
INTEGRAL and Swift observations of the Be X-ray binary 4U 1036-56 (RX
J1037.5-5647) and its possible relation with gamma-ray transients: We present timing, spectral, and long-term temporal analysis of the high mass
X-ray binary (HMXB) 4U 1036-56 using INTEGRAL and Swift observations. We show
that it is a weak hard X-... | astro-ph |
Are spectral and timing correlations similar in different spectral
states in black hole X-ray binaries?: We study the outbursts of the black hole X-ray binaries MAXI J1659-152, SWIFT
J1753.5--0127 and GX 339-4 with the Swift X-ray Telescope. The bandpass of the
X-ray Telescope has access to emission from both compone... | astro-ph |
Progress on the SOXS transients chaser for the ESO-NTT: SOXS (Son Of X-Shooter) is a single object spectrograph offering a
simultaneous spectral coverage from U- to H-band, built by an international
consortium for the 3.58-m ESO New Technology Telescope at the La Silla
Observatory. It is designed to observe all kind of... | astro-ph |
Modeling Strong Lenses from Wide-Field Ground-Based Observations in KiDS
and GAMA: Despite the success of galaxy-scale strong gravitational lens studies with
Hubble-quality imaging, the number of well-studied strong lenses remains small.
As a result, robust comparisons of the lens models to theoretical predictions
ar... | astro-ph |
Revisited Mass-Radius relations for exoplanets below 120 Earth masses: The masses and radii of exoplanets are fundamental quantities needed for
their characterisation. Studying the different populations of exoplanets is
important for understanding the demographics of the different planetary types,
which can then be lin... | astro-ph |
Validation of HD 183579b using archival radial velocities: a
warm-neptune orbiting a bright solar analog: As exoplanetary science matures into its third decade, we are increasingly
offered the possibility of pre existing, archival observations for newly
detected candidates. This is particularly poignant for the TESS ... | astro-ph |
A new calculation of Earth-skimming very- and ultra-high energy tau
neutrinos: Cosmic neutrinos above a PeV are produced either within astrophysical sources
or when ultra-high energy cosmic rays interact in transit through the cosmic
background radiation. Detection of these neutrinos will be essential for
understandi... | astro-ph |
On the distribution of collisionless particles in local potential well: The distribution of collisionless particles with infinite motion in the
presence of a local potential well is discussed. Such distribution is important
for interpretation of results of dark matter searches. The relationship
n/v=const, where n and v... | astro-ph |
Mauna Kea Sky Transparency from CFHT SkyProbe Data: Nighttime sky transparency statistics on Mauna Kea are reported based on data
from the Canada-France-Hawaii Telescope SkyProbe monitor. We focus on the
period beginning with the start of MegaCam wide-field optical imager operations
in 2003, and continuing for almost t... | astro-ph |
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