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Self-consistent Mean Field theory in weakly ionized media: We present a self-consistent mean field theory of the dynamo in 3D and
turbulent diffusion in 2D in weakly ionized gas. We find that in 3D, the
backreaction does not alter the beta effect while it suppresses the alpha
effect when the strength of a mean magnetic... | astro-ph |
Negative Energy Cosmology and the Cosmological Constant: It is well known that string theories naturally compactify on anti-de Sitter
spaces, and yet cosmological observations show no evidence of a negative
cosmological constant in the early Universe's evolution. In this letter we
present two simple nonlocal modificati... | astro-ph |
The Most Massive White Dwarfs in the Solar Neighborhood: We present an analysis of the most massive white dwarf candidates in the
Montreal White Dwarf Database 100 pc sample. We identify 25 objects that would
be more massive than $1.3~M_{\odot}$ if they had pure H atmospheres and CO
cores, including two outliers with u... | astro-ph |
Optical identification of the transient supersoft X-ray source RX
J0527.8-6954, in the LMC: Context. Close binary supersoft X-ray sources (CBSS) are binary systems that
contain a white dwarf with stable nuclear burning on its surface. These
sources, first discovered in the Magellanic Clouds, have high accretion rates... | astro-ph |
Horizontally Polarized Kink Oscillations Supported by Solar Coronal
Loops in an Asymmetric Environment: Kink oscillations are ubiquitously observed in solar coronal loops, their
understanding being crucial in the contexts of coronal seismology and
atmospheric heating. We study kink modes supported by a straight coron... | astro-ph |
Preliminary Spectral Analysis of SN 1994I: We present optical spectra of the Type Ic supernova 1994I in M51 and
preliminary non-LTE analysis of the spectra. Our models are not inconsistent
with the explosions of C+O cores of massive stars. While we find no direct
evidence for helium in the optical spectra, our models c... | astro-ph |
Mechanisms and sites of ultra high energy cosmic ray origin: We shortly discuss several astrophysical scenarios leading to cosmic ray
acceleration up to extremely high energies reaching the scale of 10^{20} eV.
The processes suggested in the literature include acceleration at relativistic
jet terminal shocks and shear ... | astro-ph |
Tensor to scalar ratio and large scale power suppression from pre-slow
roll initial conditions: We study corrections to the power spectra of curvature and tensor
perturbations and the tensor-to-scalar ratio in single field slow roll
inflation due to initial conditions imprinted by a fast-roll stage prior to
slow roll... | astro-ph |
SPITZER Observations of z~3 Lyman Break Galaxies: stellar masses and
mid-infrared properties: We describe the spectral energy distributions (SEDs) of Lyman Break Galaxies
(LBGs) at z~3 using deep mid-infrared and optical observations of the Extended
Groth Strip, obtained with IRAC and MIPS on board Spitzer and from t... | astro-ph |
Halo Mass Function and the Free Streaming Scale: The nature of structure formation around the particle free streaming scale is
still far from understood. Many attempts to simulate hot, warm, and cold dark
matter cosmologies with a free streaming cutoff have been performed with
cosmological particle-based simulations, b... | astro-ph |
Mining the gap: evolution of the magnitude gap in X-ray galaxy groups
from the 3 square degree XMM coverage of CFHTLS: We present a catalog of 129 X-ray galaxy groups, covering a redshift range
0.04<z<1.23, selected in the ~3 square degree part of the CFHTLS W1 field
overlapping XMM observations performed under the X... | astro-ph |
Cannonballs in the context of Gamma Ray Bursts: Formation sites ?: We investigate possible formation sites of the cannonballs (in the gamma ray
bursts context) by calculating their physical parameters, such as density,
magnetic field and temperature close to the origin. Our results favor scenarios
where the cannonballs... | astro-ph |
Proper motion of gamma-rays from microhalo sources: I discuss the prospects of detecting the smallest dark matter bound
structures present in the Milky Way by searching for the proper motion of
$\gamma$-ray sources in the upcoming GLAST all sky map. I show that for dark
matter particle candidates that couple to photons... | astro-ph |
The interactions of winds from massive young stellar objects: X-ray
emission, dynamics, and cavity evolution: 2D axis-symmetric hydrodynamical simulations are presented which explore the
interaction of stellar and disk winds with surrounding infalling cloud
material. The star, and its accompanying disk, blow winds in... | astro-ph |
Transition from galactic to extragalactic cosmic rays: The study of the transition between galactic and extragalactic cosmic rays
can shed more light on the end of the Galactic cosmic rays spectrum and the
beginning of the extragalactic one. Three models of transition are discussed:
ankle, dip and mixed composition mod... | astro-ph |
The Fermi Bubbles as a Scaled-up Version of Supernova Remnants: In this study, we treat the Fermi bubbles as a scaled-up version of supernova
remnants (SNRs). The bubbles are created through activities of the
super-massive black hole (SMBH) or starbursts at the Galactic center (GC).
Cosmic-rays (CRs) are accelerated at... | astro-ph |
Spectral Energy Distributions of Companion Galaxies to z$\sim$6 Quasars: Massive, quiescent galaxies are already observed at redshift $z\sim4$, i.e.
$\sim$1.5 Gyr after the Big Bang. Current models predict them to be formed via
massive, gas-rich mergers at $z>6$. Recent ALMA observations of the cool gas
and dust in $z\... | astro-ph |
The MOSDEF Survey: Neon as a Probe of ISM Physical Conditions at High
Redshift: We present results on the properties of neon emission in $z\sim2$
star-forming galaxies drawn from the MOSFIRE Deep Evolution Field (MOSDEF)
survey. Doubly-ionized neon ([NeIII]3869) is detected at $\geq3\sigma$ in 61
galaxies, representi... | astro-ph |
X-ray diagnostics of Cassiopeia A's "Green Monster": evidence for dense
shocked circumstellar plasma: The recent survey of the core-collapse supernova remnant Cassiopeia A (CasA)
with the MIRI instrument on board the James Webb Space Telescope (JWST)
revealed a large structure in the interior region, referred to as t... | astro-ph |
Dust temperature and the submillimeter-radio flux density ratio as a
redshift indicator: It is difficult to identify the distant galaxies selected in existing
submillimeter (submm)-wave surveys, because their positional accuracy is only
several arcseconds. Currently, centimeter-wave VLA observations are required in
o... | astro-ph |
Mixing Bispectrum Multipoles Under Geometric Distortions: We derive general expressions for how the Alcock-Paczynski distortions affect
the power spectrum and the bispectrum of cosmological fields. We compute
explicit formulas for the mixing coefficients of bispectrum multipoles in the
linear approximation. The leading... | astro-ph |
Machine Learning of Interstellar Chemical Inventories: The characterization of interstellar chemical inventories provides valuable
insight into the chemical and physical processes in astrophysical sources. The
discovery of new interstellar molecules becomes increasingly difficult as the
number of viable species grows c... | astro-ph |
Formation Scenario of Magnetars: The Puzzle of Isolation: Magnetars (SGRs and AXPs) are one of the most evolutionary paths of a neutron
star. These objects have an ultra-strong magnetic field $B \sim 10^{15}$ G at
their surface and show persistent X-ray pulsations and transient bursts. Till
date there are 14 magnetars ... | astro-ph |
Titan's Dynamic Love Number Implies Stably-Stratified Ocean: The dynamic quadrupole Love number of Titan measured by \Cassini is
$k_\mathrm{2,obs}=0.616\pm 0.067$, strongly indicating a global subsurface
ocean. However, the theoretical Love number due to equilibrium tides is at most
$k_\mathrm{2,eq}^\mathrm{max}\approx... | astro-ph |
The Stability of Tidal Equilibrium for Hierarchical Star-Planet-Moon
Systems: Motivated by the current search for exomoons, this paper considers the
stability of tidal equilibrium for hierarchical three-body systems containing a
star, a planet, and a moon. In this treatment, the energy and angular momentum
budgets in... | astro-ph |
Fermi LAT detection of two high Galactic latitude gamma-ray sources,
Fermi J1049.7+0435 and J1103.2+1145: The Second Fermi LAT source catalog (Nolan et al. 2012) includes as many as
1,873 sources, but initial attempts to identify counterparts at other
wavelengths resulted in 575 sources remaining unidentified. The 2F... | astro-ph |
Too Many, Too Few, or Just Right? The Predicted Number and Distribution
of Milky Way Dwarf Galaxies: We predict the spatial distribution and number of Milky Way dwarf galaxies to
be discovered in the DES and LSST surveys, by completeness correcting the
observed SDSS dwarf population. We apply most massive in the past... | astro-ph |
The Anisotropy of the Microwave Background to l = 3500: Mosaic
Observations with the Cosmic Background Imager: Using the Cosmic Background Imager, a 13-element interferometer array
operating in the 26-36 GHz frequency band, we have observed 40 sq deg of sky in
three pairs of fields, each ~ 145 x 165 arcmin, using ove... | astro-ph |
Radio-quiet neutron star 1E 1207.4-5209: a possible strong
Gravitational-wave source: There are four puzzles on 1E 1207.4-5209: (1) the characteristic age of the
pulsar is much higher than the estimated age of the supernova remnant; (2) the
magnetic field inferred from spin-down is significantly different from the
va... | astro-ph |
Giant eruptions of very massive stars: Giant eruptions or supernova-impostor events are far more mysterious than
true supernovae. An extreme example can release as much radiative energy as a
SN, ejecting several M_sun of material. These events involve continuous
radiation-driven outflows rather than blast waves. They c... | astro-ph |
The SKA and the Unknown Unknowns: As new scientists and engineers join the SKA project and as the pressures
come on to maintain costs within a chosen envelope it is worth restating and
updating the rationale for the 'Exploration of the Unknown' (EoU). Maintaining
an EoU philosophy will prove a vital ingredient for real... | astro-ph |
Magnetic field emergence in mesogranular-sized exploding granules
observed with SUNRISE/IMaX data: We report on magnetic field emergences covering significant areas of
exploding granules. The balloon-borne mission SUNRISE provided high spatial and
temporal resolution images of the solar photosphere. Continuum images,... | astro-ph |
A transiting warm giant planet around the young active star TOI-201: We present the confirmation of the eccentric warm giant planet TOI-201 b,
first identified as a candidate in \textit{TESS} photometry (Sectors 1-8,
10-13, and 27-28) and confirmed using ground-based photometry from NGTS and
radial velocities from FERO... | astro-ph |
Supernovae and their host galaxies - IV. The distribution of supernovae
relative to spiral arms: Using a sample of 215 supernovae (SNe), we analyze their positions relative
to the spiral arms of their host galaxies, distinguishing grand-design (GD)
spirals from non-GD (NGD) galaxies. We find that: (1) in GD galaxies,... | astro-ph |
Transverse Sizes of CIV Absorption Systems Measured from Multiple QSO
Sightlines: We present tomography of the circum-galactic metal distribution at redshift
1.7 to 4.5 derived from echellete spectroscopy of binary quasars. We find CIV
systems at similar redshifts in paired sightlines more often than expected for
sig... | astro-ph |
Radial velocities and membership of stars in the old, distant open
cluster Berkeley 29: Multi slit spectroscopy at the Telescopio Nazionale Galileo was employed to
measure radial velocities for 20 stars in the direction of the old open cluster
Berkeley 29, the farthest known in our Galaxy. Membership information was
... | astro-ph |
Radial Migration in Disk Galaxies I: Transient Spiral Structure and
Dynamics: We seek to understand the origin of radial migration in spiral galaxies by
analyzing in detail the structure and evolution of an idealized, isolated
galactic disk. To understand the redistribution of stars, we characterize the
time-evolutio... | astro-ph |
Some caveats about the evolution of the N/O abundance and the star
formation history: We carefully analyze how the abundance of Nitrogen over Oxygen evolves when
dependent on metallicity stellar yields with a primary component of N
proceeding from AGBs stars are used. We show the results obtained with a
chemical evol... | astro-ph |
The TESS-Keck Survey I: A Warm Sub-Saturn-mass Planet and a Caution
about Stray Light in TESS Cameras: We report the detection of a Saturn-size exoplanet orbiting HD 332231 (TOI
1456) in light curves from the Transiting Exoplanet Survey Satellite (TESS). HD
332231, an F8 dwarf star with a V-band magnitude of 8.56, wa... | astro-ph |
Magnetospheres and Disk Accretion in Herbig Ae/Be Stars: We present evidence of magnetically-mediated disk accretion in Herbig Ae/Be
stars. Magnetospheric accretion models of Balmer and sodium profiles calculated
with appropriate stellar and rotational parameters are in qualitative agreement
with the observed profiles ... | astro-ph |
HST F160W Imaging of Very Massive Galaxies at $1.5<z<3.0$: Diversity of
Structures and the Effect of Close Pairs on Number Density Estimates: We present a targeted follow-up Hubble Space Telescope WFC3 F160W imaging
study of very massive galaxies $(\log(M_{\rm{star}}/M_{\odot})> 11.2)$ selected
from a combination of ... | astro-ph |
Kappa-mechanism excitation of retrograde mixed modes in rotating B-type
stars: I examine the stability of retrograde mixed modes in rotating B-type stars.
These modes can be regarded as a hybrid between the Rossby modes that arise
from conservation of vorticity, and the Poincare modes that are gravity waves
modified ... | astro-ph |
Stability of non-homegeneous models and fine tuning of initial state: We apply phase space analysis to inhomogeneous cosmological model given by
Lema\^itre-Tolman model. We describe some general conditions required to
interpret the model stable enough and, in the present paper, apply them to two
special cases: dust fil... | astro-ph |
Dealing with large gaps in asteroseismic time series: With long data sets available for asteroseismology from space missions, it is
sometimes necessary to deal with time series that have large gaps. This is
becoming particularly relevant for TESS, which is revisiting many fields on the
sky every two years. Because sola... | astro-ph |
The continued optical to mid-IR evolution of V838 Monocerotis: The eruptive variable V838 Monocerotis gained notoriety in 2002 when it
brightened nine magnitudes in a series of three outbursts and then rapidly
evolved into an extremely cool supergiant. We present optical, near-IR, and
mid-IR spectroscopic and photometr... | astro-ph |
Rocking the Lighthouse: Circumpulsar Asteroids and Radio Intermittency: We propose that neutral, circumpulsar debris entering the light cylinder can
account for many time-dependent pulsar phenomena that are otherwise difficult
to explain. Neutral material avoids propeller ejection and injects sufficient
charges -- afte... | astro-ph |
The Unidentified Galactic EGRET Sources: The nature of the unidentified gamma-ray point sources in the galactic plane
is a long standing puzzle of gamma-ray astronomy. Kaaret and Cottam (1996)
showed that 16 of the 25 unidentified gamma-ray point sources near the galactic
plane lie in or near associations of massive st... | astro-ph |
An opening criterion for dust gaps in protoplanetary discs: We aim to understand under which conditions a low mass planet can open a gap
in viscous dusty protoplanetary discs. For this purpose, we extend the theory
of dust radial drift to include the contribution from the tides of an embedded
planet and from the gas vi... | astro-ph |
Estimation of lunar surface dielectric constant using MiniRF SAR data: A new model has been developed to estimate the dielectric constant of the
lunar surface using Synthetic Aperture Radar (SAR) data. Continuous
investigation on the dielectric constant of the lunar surface is a high
priority task due to future lunar m... | astro-ph |
Unveiling the Secrets of Gamma Ray Bursts: Gamma Ray Bursts (GRBs) are unpredictable and brief flashes of gamma rays
that occur about once a day in random locations in the sky. Since gamma rays do
not penetrate the Earth's atmosphere, they are detected by satellites, which
automatically trigger ground-based telescopes ... | astro-ph |
Extremely Red Galaxies: Preliminary results of a project aiming at unveiling the nature of the
extremely red galaxies (ERGs) (objects with colours R-K>6 and I-K>5) found in
deep optical-NIR surveys are presented. Very little is known about these
objects, the critical issue being whether they are old ellipticals at z>1 ... | astro-ph |
GD 244: asteroseismology of a pulsator in the middle of the ZZ Ceti
instability strip: We present our preliminary results on the asteroseismological investigations
of the ZZ Ceti star GD 244. We used literature values of the effective
temperature and surface gravity and utilized the White Dwarf Evolution Code of
Bisc... | astro-ph |
X-ray and Infrared Observations of Two Externally-Polluted White Dwarfs: With XMM-Newton and the Spitzer Space Telescope, we obtain upper bounds to
the X-ray fluxes from G29-38 and GD 362, and the 70 micron flux from G29-38.
These data provide indirect evidence that G29-38 is accreting from a
tidally-disrupted asteroid... | astro-ph |
Linear stability of magnetized massive protoplanetary disks: Magneto-rotational instability (MRI) and gravitational instability (GI) are
the two principle routes to turbulent angular momentum transport in accretion
disks. Protoplanetary disks may develop both. This paper aims to reinvigorate
interest in the study of ma... | astro-ph |
Density PDFs of diffuse gas in the Milky Way: The probability distribution functions (PDFs) of the average densities of the
diffuse ionized gas (DIG) and the diffuse atomic gas are close to lognormal,
especially when lines of sight at |b|<5 degree and |b|>5 degree are considered
separately. Our results provide strong s... | astro-ph |
Disentangling Morphology, Star Formation, Stellar Mass, and Environment
in Galaxy Evolution: We present a study of the spectroscopic and photometric properties of
galaxies in six nearby clusters. We perform a partial correlation analysis on
our dataset to investigate whether the correlation between star formation rat... | astro-ph |
The effects of self-interacting dark matter on the stripping of galaxies
that fall into clusters: We use the Cluster-EAGLE (C-EAGLE) hydrodynamical simulations to investigate
the effects of self-interacting dark matter (SIDM) on galaxies as they fall
into clusters. We find that SIDM galaxies follow similar orbits to ... | astro-ph |
J-state interference signatures in the Second Solar Spectrum: Modeling
the Cr I triplet at 5204-5208 A: The scattering polarization in the solar spectrum is traditionally modeled
with each spectral line treated separately, but this is generally inadequate
for multiplets where J-state interference plays a significant ... | astro-ph |
Spectral and Temporal Properties of MAXI J1836-194 during 2011 Outburst: We study black hole candidate (BHC) MAXI~J1836-194 during its 2011 outburst
with Two Component Advective Flow (TCAF) model using RXTE/PCU2 data in
$2.5-25$~keV band. From spectral fit, accretion flow parameters such as
Keplerian disk rate ($\dot{m... | astro-ph |
Optical Design and Active Optics Methods in Astronomy: Optical designs for astronomy involve implementation of active optics and
adaptive optics from X-ray to the infrared. Developments and results of active
optics methods for telescopes, spectrographs and coronagraph planet finders are
presented. The high accuracy and... | astro-ph |
The impact of interactions, bars, bulges, and AGN on star formation
efficiency in local massive galaxies: Using observations from the GASS and COLD GASS surveys and complementary data
from SDSS and GALEX, we investigate the nature of variations in gas depletion
time observed across the local massive galaxy population... | astro-ph |
Disentangling jet and disc emission from the 2005 outburst of XTE
J1118+480: The black hole X-ray transient, XTE J1118+480, has now twice been observed in
outburst - 2000 and 2005 - and on both occasions remained in the low/hard X-ray
spectral state. Here we present radio, infrared, optical, soft X-ray and hard
X-ray... | astro-ph |
Foreground influence on primordial non-Gaussianity estimates: needlet
analysis of WMAP 5-year data: We constrain the amplitude of primordial non-Gaussianity in the CMB data
taking into account the presence of foreground residuals in the maps. We
generalise the needlet bispectrum estimator marginalizing over the ampli... | astro-ph |
One-loop graviton corrections to the curvature perturbation from
inflation: We compute one-loop corrections to the power spectrum of the curvature
perturbation in single-field slow-roll inflation arising from gravitons and
inflaton interactions. The quantum corrections due to gravitons to the power
spectrum of the in... | astro-ph |
Properties of Original Impactors Estimated from Three-Dimensional
Analysis of Whole Stardust Tracks: The Stardust mission captured comet Wild 2 particles in aerogel at 6.1
km/sec. We performed high resolution three-dimensional imaging and X-ray
fluorescence mapping of whole cometary tracks in aerogel. We present the
... | astro-ph |
ISO observations of the reflection nebula Ced 201: evolution of
carbonaceous dust: We present spectrophotometric imaging mid-IR observations of the reflection
nebula Ced201. Ced201 is a part of a molecular cloud illuminated by a B9.5V
star moving through it at more than 12 km/s. The spectra of Ced201 give
evidence fo... | astro-ph |
Hydrodynamic simulations of merging clusters of galaxies: We present the results of high-resolution AP3M+SPH simulations of merging
clusters of galaxies. We find that the compression and shocking of the core gas
during a merger can lead to large increases in bolometric X-ray luminosities
and emission-weighted temperatu... | astro-ph |
Orbital and escape dynamics in barred galaxies -- IV. Heteroclinic
connections: Continuing the series of papers on a new model for a barred galaxy, we
investigate the heteroclinic connections between the two normally hyperbolic
invariant manifolds sitting over the two index-1 saddle points of the effective
potential.... | astro-ph |
Is there a circumbinary planet around NSVS 14256825?: The cyclic behaviour of (O-C) residuals of eclipse timings in the sdB+M
eclipsing binary NSVS 14256825 was previously attributed to one or two
Jovian-type circumbinary planets. We report 83 new eclipse timings that not
only fill in the gaps in those already publishe... | astro-ph |
Axion-Like Particles, Cosmic Magnetic Fields and Gamma-Ray Astrophysics: Axion-Like Particles (ALPs) are predicted by many extensions of the Standard
Model and give rise to characteristic dimming and polarization effects in a
light beam travelling in a magnetic field. In this Letter, we demonstrate that
photon-ALP mixi... | astro-ph |
A Search for Intrinsic Polarization in O Stars with Variable Winds: New observations of 9 of the brightest northern O stars have been made with
the Breger polarimeter on the 0.9~m telescope at McDonald Observatory and the
AnyPol polarimeter on the 0.4~m telescope at Limber Observatory, using the
Johnson-Cousins UBVRI b... | astro-ph |
The explosion energy of early stellar populations: The Fe-peak element
ratios in low metallicity damped Lyman-alpha systems: The relative abundances of the Fe-peak elements (Ti-Zn) at the lowest
metallicities are intimately linked to the physics of core-collapse supernova
explosions. With a sample of 25 very metal-po... | astro-ph |
3C 273 - half a century later: We have presented an optical monitoring of 3C 273, the first quasar
discovered fifty years ago. It does not show variability both on intra-night
and long-term time scales. To facilitate the further monitoring of 3C 273, we
compiled the available calibrations of the comparison stars in its... | astro-ph |
Low Mass Star Formation in the Gum Nebula: The CG~30/31/38 complex: We present photometric and spectroscopic results for the low mass pre-main
sequence (PMS) stars with spectral types K - M in the cometary globule (CG)
30/31/38 complex. We obtained multi-object high resolution spectra for the
targets selected as possib... | astro-ph |
Luminous Matter Distribution, Bulk Flows and Baryon Contents in
Cosmological Models with a Local Void: First, we consider galaxy formation from the viewpoint of hierarchical
clustering theory and discuss the possibility that inhomogeneous models with a
local void may be compatible with the observed homogeneity of gal... | astro-ph |
Hubble Space Telescope Observations of Dusty Filaments in Hercules A:
Evidence for Entrainment: We present U, V, and I-band images of the host galaxy of Hercules A (3C 348)
obtained with HST/WFC3/UVIS. We find a network of dusty filaments which are
more complex and extended than seen in earlier HST observations. The ... | astro-ph |
Testing LCDM with the Growth Function δ(a): Current Constraints: We have compiled a dataset consisting of 22 datapoints at a redshift range
(0.15,3.8) which can be used to constrain the linear perturbation growth rate
f=\frac{d\ln\delta}{d\ln a}. Five of these data-points constrain directly the
growth rate f through ei... | astro-ph |
Radio Recombination Lines at Decametre Wavelengths: Prospects for the
Future: This paper considers the suitability of a number of emerging and future
instruments for the study of radio recombination lines (RRLs) at frequencies
below 200 MHz. These lines arise only in low-density regions of the ionized
interstellar me... | astro-ph |
Chemical Conditions on Hycean Worlds: Traditionally, the search for life on exoplanets has been predominantly
focused on rocky exoplanets. Hycean worlds are a class of habitable
sub-Neptunes with planet-wide oceans and H2-rich atmospheres. Their broad range
of possible sizes and temperatures lead to a wide habitable zo... | astro-ph |
Cosmography with Galaxy Clusters: In the present work we focus on future experiments using cluster abundance
observations to constraint the Dark Energy equation of state parameter, w. To
obtain tight constraints from this kind of experiment, a reliable sample of
galaxy clusters must be obtained from deep and wide-field... | astro-ph |
Constraining the distribution of dark matter in inner galaxy with
indirect detection signal: The case of tentative 130 gev γ-ray line: The dark matter distribution in the very inner region of our Galaxy is still
in debate. In the N-body simulations a cuspy dark matter halo density profile
is favored. Several dissipat... | astro-ph |
Stellar clusters in the Gaia era: Stellar clusters are important for astrophysics in many ways, for instance as
optimal tracers of the Galactic populations to which they belong or as one of
the best test bench for stellar evolutionary models. Gaia DR1, with TGAS, is
just skimming the wealth of exquisite information we ... | astro-ph |
Improved kinematics for brown dwarfs and very low-mass stars in ChaI and
a discussion of brown dwarf formation: We present a precise kinematic study of very young brown dwarfs (BDs) in the
ChaI cloud based on radial velocities (RVs) measured with UVES / VLT. This is
compared to the kinematics of T Tauri stars (TTS) i... | astro-ph |
Search for High Energy Neutrino Emission from Gamma-Ray Bursts with the
A ntarctic Muon and Neutrino Detector Array (AMANDA): The photo-meson production of pions by shock-accelerated protons could
generate a burst of ~10^14 eV neutrinos from gamma-ray bursts (GRBs) observable
in the Antarctic Muon and Neutrino Detect... | astro-ph |
Cosmological Origin for Cosmic Rays Above $10^{19}$ eV: The cosmic ray spectrum at $10^{19}{\rm eV}-10^{20}{\rm eV}$, reported by the
Fly's Eye and the AGASA experiments, is shown to be consistent with a
cosmological distribution of sources of protons, with a power law generation
spectrum ${\rm d}\ln N/{\rm d}\ln E=-2.... | astro-ph |
Filling Factors and Ionized Masses in Planetary Nebulae: We calculate filling factors (${\varepsilon}$) and ionized masses (M$_{\rm
i}$) for a total of 84 galactic and extragalactic planetary nebulae (PNe) at
known distances. To do these calculations, we have chosen forbidden line
electron densities, observed angular d... | astro-ph |
Spatial Correlations in the Helium-Ionizing Background: After quasars ionize intergalactic HeII at z~3, a large radiation field
builds up above the HeII ionization edge. Unlike the background responsible for
HI ionizations, this field should be highly variable, thanks to the scarcity of
bright quasars and the relativel... | astro-ph |
Periodic and Phase-locked Modulation in PSR B1929+10 Observed with FAST: We present a detailed single-pulse analysis for PSR B1929+10 based on
observations with the Five-hundred-meter Aperture Spherical radio Telescope
(FAST). The main pulse and interpulse are found to be modulated with a
periodicity of $\sim12$ times ... | astro-ph |
The Gould's Belt distance survey: Very Long Baseline Interferometry (VLBI) observations can provide the
position of compact radio sources with an accuracy of order 50
micro-arcseconds. This is sufficient to measure the trigonometric parallax and
proper motions of any object within 500 pc of the Sun to better than a few... | astro-ph |
Annual and daily ideal periods for deliquescence at the landing site of
InSight based on GCM model calculations: Liquid water is one of the key elements in the search for possible life
outside of the Earth and has a wide range of consequences on various chemical
and geological processes. The InSight probe landed on M... | astro-ph |
Is Spectral Width a Reliable Measure of GRB Emission Physics?: The spectral width and sharpness of unfolded, observed GRB spectra have been
presented as a new tool to infer physical properties about GRB emission via
spectral fitting of empirical models. Following the tradition of the
'line-of-death', the spectral width... | astro-ph |
Asteroseismology of 1523 misclassified red giants using
$\textit{Kepler}$ data: We analysed solar-like oscillations in 1523 $\textit{Kepler}$ red giants
which have previously been misclassified as subgiants, with predicted $\nu_{\rm
max}$ values (based on the Kepler Input Catalogue) between 280$\mu$Hz to
700$\mu$Hz. ... | astro-ph |
3D spectroscopic surveys: Exploring galaxy evolution mechanisms: I review the major surveys of high redshift galaxies observed using integral
field spectroscopy techniques in the visible and in the infrared. The
comparison of various samples has to be done with care since they have
different properties linked to their ... | astro-ph |
Wave reflection and transmission at interface of convective and stably
stratified regions in a rotating star or planet: We use a simplified model to study wave reflection and transmission at
interface of convective region and stably stratified region (e.g. radiative
zone in star or stratification layer in gaseous pla... | astro-ph |
A simple model for the evolution of super-massive black holes and the
quasar population: An empirically motivated model is presented for accretion-dominated growth of
the super massive black holes (SMBH) in galaxies, and the implications are
studied for the evolution of the quasar population in the universe. We
inves... | astro-ph |
Constraints on the explosion mechanism and progenitors of type Ia
supernovae: Observations of SN 2011fe at early times reveal an evolution analogous to a
fireball model of constant color. In contrast, our unmixed delayed detonations
of Chandrasekhar-mass white dwarfs (DDC series) exhibit a faster brightening
concomit... | astro-ph |
Large Tensor Non-Gaussianity from Axion-Gauge Fields Dynamics: We show that an inflation model in which a spectator axion field is coupled
to an SU(2) gauge field produces a large three-point function (bispectrum) of
primordial gravitational waves, $B_{h}$, on the scales relevant to the cosmic
microwave background expe... | astro-ph |
Detecting the Glint of Starlight on the Oceans of Distant Planets: We propose that astronomers will be eventually be able to discriminate
between extrasolar Earth-like planets with surface oceans and those without
using the shape of phase light curves in the visible and near-IR spectrum. We
model the visible light curv... | astro-ph |
VLBI Scrutiny of a New Neutrino-Blazar Multiwavelength-Flare Coincidence: In the past years, evidence has started piling up that some high-energy
cosmic neutrinos can be associated with blazars in flaring states. On February
26, 2022, a new blazar-neutrino coincidence has been reported: the track-like
neutrino event IC... | astro-ph |
The Galactic WN stars: Spectral analyses with line-blanketed model
atmospheres versus stellar evolution models with and without rotation: CONTEXT: Very massive stars pass through the Wolf-Rayet (WR) stage before
they finally explode. Details of their evolution have not yet been safely
established, and their physics a... | astro-ph |
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