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All-spherical telescope with extremely wide field of view: An all-spherical catadioptic telescope with the angular field of view of
several tens of degrees in diameter and spherical focal surface is proposed for
the monitoring of large sky areas. We provide a few examples of such a system
with the apertures up to 800 m... | astro-ph |
Roche tomography of cataclysmic variables - IV. Starspots and slingshot
prominences on BV Cen: We present Roche tomograms of the G5-G8 IV/V secondary star in the
long-period cataclysmic variable BV Cen reconstructed from MIKE echelle data
taken on the Magellan Clay 6.5-m telescope. The tomograms show the presence of
... | astro-ph |
First Solar energetic particles measured on the Lunar far-side: On 2019 May 6, the Lunar Lander Neutron & Dosimetry (LND) Experiment on board
the Chang'E-4 on the far-side of the Moon detected its first small solar
energetic particle (SEP) event with proton energies up to 21MeV. Combined
proton energy spectra are studi... | astro-ph |
The Carnegie Supernova Project-I. Optical spectroscopy of
stripped-envelope supernovae: We present 170 optical spectra of 35 low-redshift stripped-envelope
core-collapse supernovae observed by the Carnegie Supernova Project-I between
2004 and 2009. The data extend from as early as -19 days (d) prior to the epoch
of B... | astro-ph |
Testing Hybrid Natural Inflation with BICEP2: We analyse Hybrid Natural Inflation in view of the recent results for the
tensor index reported by BICEP2. We find that it predicts a large running of
the scalar spectrum which is potentially detectable by large scale structure
and $21\, \mathrm{cm} $ observations. The runn... | astro-ph |
On the Application of Wesenheit Function in Deriving Distance to
Galactic Cepheids: In this work, we explore the possibility of using the Wesenheit function to
derive individual distances to Galactic Cepheids, as the dispersion of the
reddening free Wesenheit function is smaller than the optical period-luminosity
(P-... | astro-ph |
A redshifted excess in the broad emission lines after the flare of the
$γ$-ray narrow-line Seyfert 1 PKS 2004-447: PKS 2004-447 is a narrow-line Seyfert 1 (NLS1) harbouring a relativistic jet
with gamma-ray emission. On 2019-10-25, the Fermi-Large Area Telescope captured
a $\gamma$-ray flare from this source, offerin... | astro-ph |
Directionality preservation of nuclear recoils in an emulsion detector
for directional dark matter search: Nuclear emulsion is a well-known detector type proposed also for the
directional detection of dark matter. In this paper, we study one of the most
important properties of direction-sensitive detectors: the prese... | astro-ph |
Experimental study of an advanced concept of moderate-resolution
holographic spectrographs: We present the results of an experimental study of an advanced
moderate-resolution spectrograph based on a cascade of narrow-band holographic
gratings. The main goal of the project is to achieve a moderately high spectral
reso... | astro-ph |
Clumped stellar winds in supergiant high-mass X-ray binaries: X-ray
variability and photoionization: The clumping of massive star winds is an established paradigm confirmed by
multiple lines of evidence and supported by stellar wind theory. The purpose of
this paper is to bridge the gap between detailed models of inh... | astro-ph |
Hunting for wandering massive black holes: We investigate low-density accretion flows onto massive black holes (BHs)
with masses of $\gtrsim 10^5~M_\odot$ orbiting around in the outskirts of their
host galaxies, performing three-dimensional hydrodynamical simulations. Those
wandering BHs are populated via ejection from... | astro-ph |
Carbon-enhanced stars with short orbital and spin periods: Many characteristics of dwarf carbon stars are broadly consistent with a
binary origin, including mass transfer from an evolved companion. While the
population overall appears to have old-disc or halo kinematics, roughly
2$\,$per cent of these stars exhibit H$\... | astro-ph |
Constraints on dark matter particles from theory, galaxy observations
and N-body simulations: Mass bounds on dark matter (DM) candidates are obtained for particles
decoupling in or out of equilibrium with {\bf arbitrary} isotropic and
homogeneous distribution functions. A coarse grained Liouville invariant
primordial... | astro-ph |
Hidden high ionization lines in the low luminosity type II SN 2021gmj: We present comprehensive optical observations of SN~2021gmj, a type II
supernova (SN~II) discovered within a day of explosion by the Distance Less
Than 40~Mpc (DLT40) survey. Follow up observations show that SN~2021gmj is a
low luminosity SN~II (LL~... | astro-ph |
An X-ray Mini-survey of Nearby Edge-on Starburst Galaxies II. The
Question of Metal Abundance: (abbreviated) We have undertaken an X-ray survey of a far-infrared flux
limited sample of seven nearby edge-on starburst galaxies. Here, we examine the
two X-ray-brightest sample members NGC 253 and M 82 in a self-consisten... | astro-ph |
A Search for Lensed Lyman-Alpha Emitters within the Early HETDEX Data
Set: The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is a large-volume
spectroscopic survey without pre-selection of sources, searching ~ 540 deg^2
for Lyman-alpha emitting galaxies (LAEs) at 1.9 < z < 3.5. Taking advantage of
such a wid... | astro-ph |
Improved Acceleration of the GPU Fourier Domain Acceleration Search
Algorithm: We present an improvement of our implementation of the Correlation Technique
for the Fourier Domain Acceleration Search (FDAS) algorithm on Graphics
Processor Units (GPUs) (Dimoudi & Armour 2015; Dimoudi et al. 2017). Our new
improved conv... | astro-ph |
Discovery of a disrupting open cluster far into the Milky Way halo: a
recent star formation event in the leading arm of the Magellanic stream?: We report the discovery of a young (${\rm age} \sim 130~{\rm Myr}$), low-mass
($M \sim 1200~{\rm M}_\odot$), metal-poor ($[{\rm Fe}/{\rm H}] \sim -1.1$)
stellar association a... | astro-ph |
The Unpredictability of the Most Energetic Solar Events: Observations over the past two solar cycles show a highly irregular pattern
of occurrence for major solar flares, gamma-ray events, and solar energetic
particle (SEP) fluences. Such phenomena do not appear to follow the direct
indices of solar magnetic activity, ... | astro-ph |
Strategies for spectroscopy on Extremely Large Telescopes. II - Diverse
field spectroscopy: The fields of view of Extremely Large Telescopes will contain vast numbers of
spatial sampling elements (spaxels) as their Adaptive Optics systems approach
the diffraction limit over wide fields. Since this will exceed the det... | astro-ph |
The New Model of Chemical Evolution of r-process Elements Based on The
Hierarchical Galaxy Formation I: Ba and Eu: We investigate the chemical enrichment of r-process elements in the early
evolutionary stages of the Milky Way halo within the framework of hierarchical
galaxy formation using a semi-analytic merger tree... | astro-ph |
NuSTAR Tests of Sterile-Neutrino Dark Matter: New Galactic Bulge
Observations and Combined Impact: We analyze two dedicated NuSTAR observations with exposure ${\sim}190$ ks
located ${\sim}10^\circ$ from the Galactic plane, one above and the other
below, to search for x-ray lines from the radiative decay of sterile-ne... | astro-ph |
H.E.S.S. observations of the flaring gravitationally lensed galaxy PKS
1830-211: PKS 1830-211 is a known macrolensed quasar located at a redshift of z=2.5.
Its high-energy gamma-ray emission has been detected with the Fermi-LAT
instrument and evidence for lensing was obtained by several authors from its
high-energy d... | astro-ph |
X-ray Fading and Expansion in the "Miniature Supernova Remnant" of GK
Persei: We report on a second epoch of Chandra X-ray imaging spectroscopy of the
spatially-resolved old nova remnant GK Persei. An ACIS-S3 observation of 97.4
ks was conducted in November 2013 after a lapse of 13.8 years from the last
visit in 2000... | astro-ph |
Test magnetohydrostatic extrapolation with radiative MHD simulation of a
solar flare: Context. On the sun, the magnetic field vector is measured routinely only in
the photosphere. By using these photospheric measurements as boundary
condition, we developed the magnetohydrostatic (MHS) extrapolation to model the
solar... | astro-ph |
Dust-trapping Rossby vortices in protoplanetary disks: One of the most challenging steps in planet formation theory is the one
leading to the formation of planetesimals of kilometre size. A promising
scenario involves the existence of vortices able to concentrate a large amount
of dust and grains in their centres. Up t... | astro-ph |
Mirror dark matter discovered?: Recent astrophysical data indicates that dark matter shows a controversial
behaviour in galaxy cluster collisions. In case of the notorious Bullet
cluster, dark matter component of the cluster behaves like a collisionless
system. However, its behaviour in the Abell 520 cluster indicates ... | astro-ph |
Effects of Quasi-Static Aberrations in Faint Companion Searches: We present the first results obtained at CFHT with the TRIDENT infrared
camera, dedicated to the detection of faint companions close to bright nearby
stars. The camera's main feature is the acquisition of three simultaneous
images in three wavelengths (si... | astro-ph |
Non-Parametric Analysis for the Dark Matter Density Evolution: In this paper, we investigate a potential departure in the standard dark
matter density evolution law, $\rho_{dm} = \rho_{dm,0}(1+z)^3$. The method
involves considering a deformed evolution model, denoted as $\rho_{dm} =
\rho_{dm,0}(1+z)^3f(z)$, and searchi... | astro-ph |
Time-evolution of Peak Energy and Luminosity Relation within Pulses for
GRB 061007: Probing Fireball Dynamics: We perform a time-resolved spectral analysis of bright, long Gamma-ray burst
GRB 061007 using Suzaku/WAM and Swift/BAT. Thanks to the large effective area
of the WAM, we can investigate the time evolution of... | astro-ph |
Exoplanet population inference and the abundance of Earth analogs from
noisy, incomplete catalogs: No true extrasolar Earth analog is known. Hundreds of planets have been found
around Sun-like stars that are either Earth-sized but on shorter periods, or
else on year-long orbits but somewhat larger. Under strong assum... | astro-ph |
Computed Rotational Collision Rate Coefficients for Recently Detected
Anionic Cyanopolyynes: We report new results from quantum calculations of energy-transfer processes
taking place in interstellar environments and involving two newly observed
molecular species: C$_5$N$^-$ and C$_7$N$^-$ in collision with He atoms a... | astro-ph |
Line-of-sight Effects on Observability of Kink and Sausage Modes in
Coronal Structures with Imaging Telescopes: Kink modes of solar coronal structures, perturbing the loop in the direction
along the line-of-sight (LOS), can be observed as emission intensity
disturbances propagating along the loop provided the angle b... | astro-ph |
Differential Rotation in Magnetized and Non-magnetized Stars: Effects of magnetic field on stellar differential rotation are studied by
comparing magnetohydrodynamic (MHD) models and their hydrodynamic (HD)
counterparts in the broad range of rotation rate and in varying initial
rotation profile. Fully-compressible MHD ... | astro-ph |
Hubble Space Telescope Grism Spectroscopy of Extreme Starbursts Across
Cosmic Time: The Role of Dwarf Galaxies in the Star Formation History of the
Universe: Near infrared slitless spectroscopy with the Wide Field Camera 3, onboard the
Hubble Space Telescope, offers a unique opportunity to study low-mass galaxy
pop... | astro-ph |
Simulating young star clusters with primordial binaries: We simulate a cluster of 144179 stars including 13107 primordial hard
binaries (10% of the total number of single stars and binary centers of mass),
using direct integration of the equations of motion of all stars and binaries
and incorporating the effects of ste... | astro-ph |
A Gradual Decline of Star Formation since Cluster In-fall: New Kinematic
Insights into Environmental Quenching at 0.3 $< z <$ 1.1: The environments where galaxies reside crucially shape their star formation
histories. We investigate a large sample of 1626 cluster galaxies located
within 105 galaxy clusters spanning a... | astro-ph |
Kreutz Sungrazers: Summary of Recent Modeling and Orbits of the SOHO
Objects: I summarize and streamline the results of recent modeling of the orbital
evolution and cascading fragmentation of the Kreutz sungrazers. The model
starts with Aristotle's comet -- the progenitor whose nucleus is assumed to be
a contact bina... | astro-ph |
The Host Galaxy and Rapidly Evolving Broad-line Region in the
Changing-look Active Galactic Nucleus 1ES 1927+654: Changing-look active galactic nuclei (AGNs) present an important laboratory
to understand the origin and physical properties of the broad-line region
(BLR). We investigate follow-up optical spectroscopy s... | astro-ph |
Unidentified 3EG gamma-ray sources at low galactic latitude: We present a study on the possible association of unidentified $\gamma$-ray
sources in the Third EGRET (3EG) catalog with different types of galactic
objects such as Wolf-Rayet and Of stars, supernova remnants (SNRs), and OB
associations (considered as pulsar... | astro-ph |
Modeling the MgI from the NUV to MIR: I. The Solar Case: Semi-empirical models of the solar atmosphere are used to study the radiative
environment of any planet in our solar system. There is a need for reliable
atomic data for neutral atoms and ions in the atmosphere to obtain improved
calculated spectra. Atomic parame... | astro-ph |
Magnitude Offset between Lensed Stars and Observed Stars - a New Probe
of the Structure of the Galactic Bar: We propose a new method that can be used to constrain the properties of the
Galactic bar (bulge). If the majority of the lensing objects are in the
Galactic bar, then we predict a systematic offset in the appa... | astro-ph |
Ultrahigh energy neutrinos scattering off relic light neutrinos to
explain UHECR above GZK cut off and thin blazars: UHE neutrinos may transfer highest cosmic-rays energies overcoming
$2.75K^\circ$ BBR and radio-waves opacities (the GZK cut off) from most distant
AGN sources at the age of the Universe. These UHE $\nu... | astro-ph |
Impact of stochastic gas motions on galaxy cluster abundance profiles: The impact of stochastic gas motions on the metal distribution in cluster
core is evaluated. Peaked abundance profiles are a characteristic feature of
clusters with cool cores and abundance peaks are likely associated with the
brightest cluster gala... | astro-ph |
Molecular gas streamers feeding and obscuring the active nucleus of
NGC1068: We report the first direct observations of neutral, molecular gas streaming
in the nucleus of NGC1068 on scales of <30 pc using SINFONI near-infrared
integral field spectroscopy. At a resolution of 0.075", the flux map of 2.12
$\mu$m 1-0 S(1... | astro-ph |
The Hemispheric Asymmetry of Solar Activity During the Twentieth Century
and the Solar Dynamo: We believe the Babcock--Leighton process of poloidal field generation to be
the main source of irregularity in the solar cycle. The random nature of this
process may make the poloidal field in one hemisphere stronger than t... | astro-ph |
Super-horizon second-order perturbations for cosmological random
fluctuations and the Hubble-constant problem: The super-horizon second-order density perturbations corresponding to
cosmological random fluctuations are considered, their non-vanishing spatial
average is shown to be useful in solving the serious problem... | astro-ph |
Why Low-Mass Black-Hole Binaries Are Transient: We consider transient behavior in low-mass X-ray binaries. In short-period
neutron-star systems (orbital period less than ~ 1d) irradiation of the
accretion disk by the central source suppresses this except at very low mass
transfer rates. Formation constraints however im... | astro-ph |
Revisiting dynamical friction: the role of global modes and local wakes: The orbital decay of a perturber within a larger system plays a key role in
the dynamics of many astrophysical systems -- from nuclear star clusters or
globular clusters in galaxies, to massive black holes in galactic nuclei, to
dwarf galaxy satel... | astro-ph |
Resonant Signatures of Heavy Scalar Fields in the Cosmic Microwave
Background: We investigate the possibility that a heavy scalar field, whose mass exceeds
the Hubble scale during inflation, could leave non-negligible signatures in the
Cosmic Microwave Background (CMB) temperature anisotropy power spectrum through
th... | astro-ph |
Orbital X-ray modulation study of three Supergiant HMXBs: We present the orbital X-ray modulation study of three high mass X- ray
binary systems, IGR J18027-2016, IGR J18483-0311 and IGR J16318-4848 using data
obtained with RXTE-ASM, Swift-BAT and INTEGRAL-ISGRI. Using the long term light
curves of the eclipsing HMXB I... | astro-ph |
Massive Galaxy Mergers Have Distinctive Global HI Profiles: The global 21 cm HI emission-line profile of a galaxy encodes valuable
information on the spatial distribution and kinematics of the neutral atomic
gas. Galaxy interactions significantly influence the HI disk and imprint
observable features on the integrated H... | astro-ph |
Bayes-X: a Bayesian inference tool for the analysis of X-ray
observations of galaxy clusters: We present the first public release of our Bayesian inference tool, Bayes-X,
for the analysis of X-ray observations of galaxy clusters. We illustrate the
use of Bayes-X by analysing a set of four simulated clusters at z=0.2-... | astro-ph |
The Flux Auto- and Cross-Correlation of the Lyman-alpha Forest. I.
Spectroscopy of QSO Pairs with Arcminute Separations and Similar Redshifts: The Lyman-alpha forest has opened a new redshift regime for cosmological
investigation. At z > 2 it provides a unique probe of cosmic geometry and an
independent constraint on... | astro-ph |
Stellar disks of Collisional Ring Galaxies I. New multiband images,
Radial intensity and color profiles, and confrontation with N-body
simulations: We present new multi-band imaging data in the optical (BVRI and Halpha) and
near infrared bands (JHK) of 15 candidate ring galaxies from the sample of
Appleton & Marsto... | astro-ph |
SELENA: Semi-analytical Integrator for Lunar Artificial Satellites: The present report summarizes the main theory and implementation steps
associated with SELENA (SEmi-anaLytical intEgrator for a luNar Artificial
satellite), i.e. the semi-analytical propagator for lunar satellite orbits
developed in the framework of th... | astro-ph |
Comparison of numerical methods for computing the repeated Compton
scattering of photons in isotropic media: Repeated Compton scattering of photons with thermal electrons is one of the
fundamental processes at work in many astrophysical plasma. Solving the exact
evolution equations is hard and one common simplificati... | astro-ph |
Burst and Outburst Characteristics of Magnetar 4U 0142+61: We have compiled the most comprehensive burst sample from magnetar 4U
0142+61, comprising 27 bursts from its three burst-active episodes in 2011,
2012 and the latest one in 2015 observed with Swift/BAT and Fermi/GBM. Bursts
from 4U 0142+61 morphologically resem... | astro-ph |
Multiple BeppoSAX Observations of IC 4329A to Probe the Origin of the
Compton Reflection Component in Seyfert 1 Galaxies: IC 4329A is the brightest known Seyfert galaxy in hard (~2-30 keV) X-rays and
is likely to be representative of Seyfert 1 galaxies as a class. A recent 100
ks BeppoSAX observation (Perola et al. 1... | astro-ph |
Toward a tomographic analysis of the cross-correlation between Planck
CMB lensing and H-ATLAS galaxies: We present an improved and extended analysis of the cross-correlation between
the map of the Cosmic Microwave Background (CMB) lensing potential derived from
the \emph{Planck} mission data and the high-redshift gal... | astro-ph |
Application of chaos indicators in the study of dynamics of S-type
extrasolar planets in stellar binaries: The orbits of two individual planets in two known binary star systems, \gamma
Cephei and HD 196885 are numerically integrated using various numerical
techniques to assess the chaotic or quasi-periodic nature of ... | astro-ph |
The U.S. Eclipse Megamovie in 2017: a white paper on a unique outreach
event: Totality during the solar eclipse of 2017 traverses the entire breadth of the
continental United States, from Oregon to South Carolina. It thus provides the
opportunity to assemble a very large number of images, obtained by amateur
observer... | astro-ph |
Simulations of coronagraphy with a dynamic hologram for the direct
detection of exo-planets: In a previous paper, we discussed an original solution to improve the
performances of coronagraphs by adding, in the optical scheme, an adaptive
hologram removing most of the residual speckle starlight.
In our simulations, ... | astro-ph |
Reconciling the Metallicity Distributions of Gamma-ray Burst, Damped
Lyman-alpha, and Lyman-break Galaxies at z=3: We test the hypothesis that the host galaxies of long-duration gamma-ray
bursts (GRBs) as well as quasar-selected damped Lyman-alpha (DLA) systems are
drawn from the population of UV-selected star-formin... | astro-ph |
Supernova ejecta interacting with a circumstellar disk. I.
two-dimensional radiation-hydrodynamic simulations: We perform a series of two-dimensional radiation-hydrodynamic simulations of
the collision between supernova ejecta and circumstellar media (CSM). The
hydrodynamic interaction of a fast flow and the surround... | astro-ph |
Deep Fields: The Faint sub-mJy and microJy Radio Sky - A VLBI
Perspective: Until recently, VLBI targets have been drawn almost exclusively from the
brightest and most compact radio sources in the sky, with typical flux
densities well in excess of a few tens of mJy. These sources are predominantly
identified with Acti... | astro-ph |
On the stellar populations of massive galaxies: In this Letter, we analyse the predicted physical properties of massive
galaxies, in the framework of recent semi-analytic models of galaxy formation.
All models considered account for winds driven by supernovae explosions and
suppression of gas condensation at the centre... | astro-ph |
A Ubiquitous Unifying Degeneracy in Two-Body Microlensing Systems: While gravitational microlensing by planetary systems provides unique vistas
on the properties of exoplanets, observations of a given 2-body microlensing
event can often be interpreted with multiple distinct physical configurations.
Such ambiguities are... | astro-ph |
On the DM interpretation of the origin of non-thermal phenomena in
galaxy clusters: (Abridged) We study the predictions of various annihilating Dark Matter (DM)
models in order to interpret the origin of non-thermal phenomena in galaxy
clusters. We consider three neutralino DM models with light (9 GeV),
intermediate ... | astro-ph |
Searching for Molecular Jets from High-Mass Protostars: We report Very Large Array (VLA) observations in the Q-band toward 10 ionized
jet candidates to search for SiO emission, a well-known shocked gas tracer. We
detected 7 mm continuum counterparts toward 90% of the jet candidates. In most
cases, the jet candidate is ... | astro-ph |
CO Cameron band and CO2+ UV doublet emissions in the dayglow of Venus:
Role of CO in the Cameron band production: Present study deals with the model calculations of CO Cameron band and CO2+
ultraviolet doublet emissions in the dayglow of Venus. The overhead and limb
intensities of CO Cameron band and CO2+ UV doublet ... | astro-ph |
Early assembly of the most massive galaxies: The current consensus is that galaxies begin as small density fluctuations in
the early Universe and grow by in situ star formation and hierarchical merging.
Stars begin to form relatively quickly in sub-galactic sized building blocks
called haloes which are subsequently ass... | astro-ph |
The chemical composition of Ultracompact Dwarf Galaxies in the Virgo and
Fornax Clusters: We present spectroscopic observations of ultra compact dwarf (UCD) galaxies
in the Fornax and Virgo Clusters made to measure and compare their stellar
populations. The spectra were obtained on the Gemini-North (Virgo) and
Gemini... | astro-ph |
Polarization in microlensing towards the Galactic bulge: Gravitational microlensing, when finite size source effects are relevant,
provides an unique tool for the study of source star stellar atmospheres
through an enhancement of a characteristic polarization signal. This is due to
the differential magnification induce... | astro-ph |
Probing the Curious Case of a Galaxy Cluster Merger in Abell 115 with
High Fidelity Chandra X-ray Temperature and Radio Maps: We present results from an X-ray and radio study of the merging galaxy
cluster Abell 115. We use the full set of 5 Chandra observations taken of A115
to date (360 ks total integration) to cons... | astro-ph |
A New Sample of Cool Subdwarfs from SDSS: Properties and Kinematics: We present a new sample of M subdwarfs compiled from the 7th data release of
the Sloan Digital Sky Survey. With 3517 new subdwarfs, this new sample
significantly increases the number of spectroscopically confirmed low-mass
subdwarfs. This catalog also... | astro-ph |
Probing the Astrophysics of Cluster Outskirts: In galaxy clusters the entropy distribution of the IntraCluster Plasma
modulates the latter's equilibrium within the Dark Matter gravitational wells,
as rendered by our Supermodel. We argue the entropy production at the boundary
shocks to be reduced or terminated as the ac... | astro-ph |
Zel'dovich approximation and General Relativity: We show how the Zel'dovich approximation and the second order displacement
field of Lagrangian perturbation theory can be obtained from a general
relativistic gradient expansion in \Lambda{}CDM cosmology. The displacement
field arises as a result of a second order non-lo... | astro-ph |
APSYNSIM: An Interactive Tool To Learn Interferometry: The APerture SYNthesis SIMulator is a simple interactive tool to help the
students visualize and understand the basics of the Aperture Synthesis
technique, applied to astronomical interferometers. The users can load many
different interferometers and source models ... | astro-ph |
Effects of Radiation Pressure on the Evaporative Wind of HD 209458b: The role of radiation pressure in shaping exoplanet photoevaporation remains
a topic of contention. Radiation pressure from the exoplanet's host star has
been proposed as a mechanism to drive the escaping atmosphere into a "cometary"
tail and explain ... | astro-ph |
The GRB/SN Connection: An Improved Spectral Flux Distribution for the
Supernova Candidate Associated with GRB 970228: We better determine the spectral flux distribution of the supernova candidate
associated with GRB 970228 by modeling the spectral flux distribution of the
host galaxy of this burst, fitting this model... | astro-ph |
Distinguishing Propagation vs. Launch Physics of Astrophysical Jets and
the Role of Experiments: The absence of other viable momentum sources for collimated flows leads to
the likelihood that magnetic fields play a fundamental role in jet launch
and/or collimation in astrophysical jets. To best understand the physics... | astro-ph |
Evidence for a Non-Expanding Universe: Surface Brightness Data From HUDF: Surface brightness data can distinguish between a Friedman-Robertson-Walker
expanding universe and a non-expanding universe. For surface brightness
measured in AB magnitudes per angular area, all FRW models, regardless of
cosmological parameters,... | astro-ph |
Simulations at the Dwarf Scale: From Violent Dwarfs at Cosmic Dawn and
Cosmic Noon to Quiet Discs today: Dwarf galaxies with stellar masses around 10^9 Msun can be explored at high
and low redshifts and they give a glimpse of the different conditions of galaxy
formation at different epochs. Using a large sample of ab... | astro-ph |
SN 2005ip: A Luminous Type IIn Supernova Emerging from a Dense
Circumstellar Medium as Revealed by X-Ray Observations: We report on X-ray spectral evolution of the nearby Type IIn supernova (SN)
2005ip, based on Chandra and Swift observations covering from ~1 to 6 years
after the explosion. X-ray spectra in all epoch... | astro-ph |
Kinematical evolution of multiple stellar populations in star clusters: We present the results of a suite of \Nbody simulations aimed at
understanding the fundamental aspects of the long-term evolution of the
internal kinematics of multiple stellar populations in globular clusters. Our
models enable us to study the coo... | astro-ph |
The X-ray activity-rotation relation of T Tauri stars in Taurus-Auriga: The Taurus-Auriga star-forming complex hosts the only population of T Tauri
stars in which an anticorrelation of X-ray activity and rotation period has
been observed. We have used XMM-Newton's European Photon Imaging Cameras to
perform the most sen... | astro-ph |
Galaxy and Mass Assembly (GAMA): Probing galaxy-group correlations in
redshift space with the halo streaming model: We have studied the galaxy-group cross-correlations in redshift space for the
Galaxy And Mass Assembly (GAMA) Survey. We use a set of mock GAMA galaxy and
group catalogues to develop and test a novel 'h... | astro-ph |
A Novel Survey for Young Substellar Objects with the W band Filter.V. IC
348 and Barnard 5 in the Perseus Cloud: We report the discovery of substellar objects in the young star cluster IC
348 and the neighboring Barnard 5 dark cloud, both at the eastern end of the
Perseus star-forming complex. The substellar candidat... | astro-ph |
Rotational quenching of rotationally-excited H$_2$O in collisions with
He: Theoretical rotational quenching cross sections and rate coefficients of
ortho- and para-H$_2$O due to collisions with He atoms are presented. The
complete angular momentum close-coupling approach as well as the coupled-states
approximation fo... | astro-ph |
Analytical Blowup Solutions to the Isothermal Euler-Poisson Equations of
Gaseous Stars in R^N: This article is the continued version of the analytical blowup solutions for
2-dimensional Euler-Poisson equations in "M.W. Yuen, Analytical Blowup
Solutions to the 2-dimensional Isothermal Euler-Poisson Equations of Gaseou... | astro-ph |
UGC 7069: The largest ring galaxy: We find that UGC 7069 is the largest ring galaxy known to date. In this
Letter, we present a multiwavelength study of this galaxy (combining radio,
2MASS, optical and ultraviolet data). The ring of UGC 7069, whose diameter
measures ~115 kpc, is also warped at its edges. The nucleus ap... | astro-ph |
Counts and Colours of Faint Stars in 5 Fields Near the North Galactic
Pole: Faint star number counts in the photographic \jmag band and \bvcol colour
distributions are presented for a 1.08 deg$^2$ field near the North Galactic
Pole. Due to the excellent star/galaxy discrimination we count stars as faint
as \jmag = 23... | astro-ph |
A Vlbi Survey of Weak Extragalactic Radio Sources for the Alignment of
the Icrf and the Future Gaia Frame: The space astrometry mission GAIA will construct a dense optical QSO-based
celestial reference frame. For consistency between the optical and radio
positions, it will be important to align the GAIA frame and the... | astro-ph |
An internally consistent distance framework in the Local Group: Accurate and precise astronomical distance determinations are crucial for
derivations of, among others, the masses and luminosities of a large variety of
distant objects. Astronomical distance determination has traditionally relied
on the concept of a `dis... | astro-ph |
Voids and Halos in Voids statistics as a probe of the Expansion History
of the Universe: Structures in the Universe are arranged into the cosmic web. Distributions,
statistics, and evolutions of the structures can be used as probes for
cosmological models. We investigate the number density of voids and dark matter
ha... | astro-ph |
Radio light curves during the passage of cloud G2 near Sgr A*: We calculate radio light curves produced by the bow shock that is likely to
form in front of the G2 cloud when it penetrates the accretion disk of Sgr A*.
The shock acceleration of the radio-emitting electrons is captured
self-consistently by means of first... | astro-ph |
Charged Cosmic Rays: a Review of Balloon and Space Borne Measurements: Current experimental data on cosmic-ray charged leptons are briefly reviewed
including measurements of the positron fraction, electron and positron spectra
and inclusive electron+positron data. Precision measurements by PAMELA and
AMS-02 of the posi... | astro-ph |
Propagation of Ultra High Energy Cosmic Rays and the Production of
Cosmogenic Neutrinos: We present an updated version of the {\it SimProp} Monte Carlo code to study
the propagation of ultra high energy cosmic rays in astrophysical backgrounds
computing the cosmogenic neutrino fluxes expected on earth. The study of
s... | astro-ph |
Constraints on Pre-inflation Fluctuations in a Nearly Flat Open
ΛCDM Cosmology: We analyze constraints on parameters characterizing the pre-inflating
universe in an open inflation model with a present slightly open $\Lambda$CDM
universe. We employ an analytic model to show that for a broad class of
inflation-generati... | astro-ph |
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