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Architectures of Planetary Systems and Implications for their Formation: Doppler planet searches revealed that many giant planets orbit close to their
host star or in highly eccentric orbits. These and subsequent observations
inspired new theories of planet formation that invoke gravitation interactions
in multiple pla... | astro-ph |
HR 62: A New Evolved Chemically Peculiar Late-B Star?: The spectrum of the evolved B8 III giant HR 62 exhibits weak He-lines and
strong Mn and P lines. HR 62 therefore resembles both a HgMn star (CP3) and a
He-weak PGa star (CP4).
This study is a companion project to a high resolution survey of slowly
rotationg late-... | astro-ph |
Modelling the radio to X-ray SED of galaxies: We present our model to interpret the SED of galaxies. The model for the UV
to sub-mm SED is already well established (Silva et al 1998). We remind here
its main features and show some applications. Recently we have extended the
model to the radio range (Bressan et al 2001)... | astro-ph |
Chromospheric polarimetry through multi-line observations of the 850 nm
spectral region III: Chromospheric jets driven by twisted magnetic fields: We investigate the diagnostic potential of the spectral lines at 850 nm for
understanding the magnetism of the lower atmosphere. For that purpose, we use a
newly developed... | astro-ph |
Cosmological implications of the KATRIN experiment: The upcoming Karlsruhe Tritium Neutrino (KATRIN) experiment will put
unprecedented constraints on the absolute mass of the electron neutrino,
$\mnue$. In this paper we investigate how this information on $\mnue$ will
affect our constraints on cosmological parameters. ... | astro-ph |
Transiting Planets with LSST I: Potential for LSST Exoplanet Detection: The Large Synoptic Survey Telescope (LSST) has been designed in order to
satisfy several different scientific objectives that can be addressed by a
ten-year synoptic sky survey. However, LSST will also provide a large amount of
data that can then b... | astro-ph |
The High-Resolution Coronal Imager, Flight 2.1: The third flight of the High-Resolution Coronal Imager (Hi-C 2.1) occurred on
May 29, 2018, the Sounding Rocket was launched from White Sands Missile Range
in New Mexico. The instrument has been modified from its original configuration
(Hi-C 1) to observe the solar corona... | astro-ph |
A possible influence on standard model of quasars and active galactic
nuclei in strong magnetic field: Recent observational evidence indicates that the center of our Milky Way
harbours a super-massive object with ultra-strong radial magnetic field
(Eatough et al., 2013). Here we demonstrate that the radiations observ... | astro-ph |
Kernel Selection for Gaussian Process in Cosmology: with Approximate
Bayesian Computation Rejection and Nested Sampling: Gaussian Process (GP) has gained much attention in cosmology due to its
ability to reconstruct cosmological data in a model-independent manner. In this
study, we compare two methods for GP kernel s... | astro-ph |
Recovery from Giant Eruptions in Very Massive Stars: We use a hydro-and-radiative-transfer code to explore the behavior of a very
massive star (VMS) after a giant eruption -- i.e., following a supernova
impostor event. Beginning with reasonable models for evolved VMSs with masses
of $80~M_\odot$ and $120~M_\odot$, we s... | astro-ph |
The Distance to NGC 4993: The Host Galaxy of the Gravitational-wave
Event GW170817: The historic detection of gravitational waves from a binary neutron star
merger (GW170817) and its electromagnetic counterpart led to the first accurate
(sub-arcsecond) localization of a gravitational-wave event. The transient was
fou... | astro-ph |
The Fluence Duration Bias: The fluence duration bias causes fluences and durations of faint gamma-ray
bursts to be systematically underestimated relative to their peak fluxes. Using
Monte Carlo analysis, we demonstrate how this effect explains characteristics
of structure of the fluence vs. 1024 ms peak flux diagram. E... | astro-ph |
Testing the dark energy with gravitational lensing statistics: We study the redshift distribution of two samples of early-type gravitational
lenses, extracted from a larger collection of 122 systems, to constrain the
cosmological constant in the LCDM model and the parameters of a set of
alternative dark energy models (... | astro-ph |
Formation of solar quiescent coronal loops through magnetic reconnection
in an emerging active region: Coronal loops are building blocks of solar active regions. However, their
formation mechanism is still not well understood. Here we present direct
observational evidence for the formation of coronal loops through ma... | astro-ph |
Interior properties of the inner Saturnian moons from space astrometry
data: During the thirteen years in orbit around Saturn before its final plunge, the
Cassini spacecraft provided more than ten thousand astrometric measurements.
Such large amounts of accurate data enable the search for extremely faint
signals in t... | astro-ph |
The first estimate of radio jet proper motion at z>5: The extremely high redshift (z=5.3) radio source SDSS J102623.61+254259.5
(J1026+2542) is among the most distant and most luminous radio-loud active
galactic nuclei (AGN) known to date. Its one-sided radio jet structure on
milli-arcsecond (mas) and ~10-mas scales ty... | astro-ph |
Spherical collapse and halo abundance in shift-symmetric Galileon theory: We present the nonlinear growth of bound cosmological structures using the
spherical collapse approach in the shift-symmetric Galileon theories. In
particular, we focus on the class of models belonging to the Kinetic Gravity
Braiding by adopting ... | astro-ph |
Evolution of major sedimentary mounds on Mars: We present a new database of $>$300 layer-orientations from sedimentary
mounds on Mars. These layer orientations, together with draped landslides, and
draping of rocks over differentially-eroded paleo-domes, indicate that for the
stratigraphically-uppermost $\sim$1 km, the... | astro-ph |
A high molecular fraction in a sub-damped absorber at z=0.56: Measuring rest-frame ultraviolet rotational transitions from the Lyman and
Werner bands in absorption against a bright background continuum is one of the
few ways to directly measure molecular hydrogen (H2). Here we report the
detection of Lyman-Werner absor... | astro-ph |
The jet of Markarian 501 from the sub-parsec to the kpc scale: We have observed the BL Lac object Markarian 501 at 1.4 GHz with the High
Sensitivity Array and at 86 GHz with the global VLBI mm array. Thanks to the
great resolution and sensitivity provided by these instruments, we probe
regions of the radio jets never a... | astro-ph |
The ESO Imaging Survey: Status Report and Preliminary Results: The ESO Imaging Survey (EIS) presented in early issues of the Messenger, and
with up-to-date information on the ongoing observations available on the Web
(http://www.eso.org/eis), is a concerted effort by ESO and the Member State
community to provide target... | astro-ph |
Wolter-I-like X-ray telescope structure using one conical mirror and one
quadric mirror: Nested multilayer mirrors are commonly used in X-ray telescope structures to
increase the collecting area. To balance the difficulty and cost of producing
these mirrors, the classical Wolter-I structure has previously been replac... | astro-ph |
Dust Processing in Disks around T Tauri Stars: The 8-14 micron emission spectra of 12 T Tauri stars in the Taurus/Auriga
dark clouds and in the TW Hydrae association obtained with the Infrared
Spectrograph (IRS; The IRS is a collaborative venture between Cornell
University and Ball Aerospace Corporation funded by NASA ... | astro-ph |
Evolution Through the Post-Starburst Phase: Using Post-Starburst
Galaxies as Laboratories for Understanding the Processes that Drive Galaxy
Evolution: Post-starburst (or "E+A") galaxies trace the fastest and most dramatic
processes in galaxy evolution. Recent work studying the evolution of galaxies
through this pha... | astro-ph |
A Comprehensive Consistency Check between Synchrotron radiation and the
Observed Gamma-ray Burst Spectra: We performed a time-resolved spectral analysis of 53 bright gamma-ray bursts
(GRBs) observed by \textit{Fermi}/GBM. Our sample consists of 908 individual
spectra extracted from the finest time slices in each GRB.... | astro-ph |
The Cologne Database for Molecular Spectroscopy, CDMS, in the Virtual
Atomic and Molecular Data Centre, VAMDC: The CDMS was founded 1998 to provide in its catalog section line lists of
molecular species which may be observed in various astronomical sources using
radio astronomy. The line lists contain transition freq... | astro-ph |
NH$_3$(3,3) and CH$_3$OH near Supernova Remnants: GBT and VLA
Observations: We report on Green Bank Telescope 23.87 GHz NH$_3$(3,3), emission
observations in five supernova remnants interacting with molecular clouds
(G1.4$-$0.1, IC443, W44, W51C, and G5.7$-$0.0). The observations show a clumpy
gas density distributio... | astro-ph |
Green's function of the cosmological thermalization problem II: effect
of photon injection and constraints: The energy spectrum of the cosmic microwave background (CMB) provides a
powerful tool for constraining standard and non-standard physics in the
primordial Universe. Previous studies mainly highlight spectral di... | astro-ph |
The evolution of late-type galaxies from CASSOWARY lensing systems: We explore the properties of lensing galaxies and lensed faint sources at
redshifts between 1.5 and 3.0. Our sample consists of 9 carefully selected
strongly-lensed galaxies discovered by the CASSOWARY survey in the Sloan
Digital Sky Survey (SDSS) data... | astro-ph |
Chandra and Hubble Space Telescope Study of the Globular Cluster NGC 288: We report on the Chandra X-ray Observatory observations of the globular
cluster NGC 288. We detect four X-ray sources within the core radius and seven
additional sources within the half-mass radius down to a limiting luminosity of
Lx=7e30 erg/s (... | astro-ph |
Astrometric Plate Reduction with Orthogonal Functions and
Milli-Arcseconds Accuracy in Deep Proper Motion Surveys: We have been doing a sample survey in UBV photometry and proper motions as
part of an investigation of galactic structure and evolution. The programme is
based on Schmidt plates (from OCA, Tautenburg, Pa... | astro-ph |
Comparison of modified black-body fits for the estimation of dust
optical depths in interstellar clouds: When dust far-infrared spectral energy distributions (SEDs) are fitted with a
single modified black body (MBB), the optical depths tend to be underestimated.
This is caused by temperature variations, and fits with... | astro-ph |
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). IV.
Discovery of 41 Quasars and Luminous Galaxies at 5.7 < z < 6.9: We report discovery of 41 new high-z quasars and luminous galaxies, which
were spectroscopically identified at 5.7 < z < 6.9. This is the fourth in a
series of papers from the Subaru High... | astro-ph |
Photometric Variability of the Disk Integrated Infrared Emission of the
Earth: We present an analysis of the global-integrated mid-infrared emission flux of
the Earth based on data derived from satellite measurements. We have studied
the photometric annual, seasonal, and rotational variability of the thermal
emission... | astro-ph |
The COS-Halos Survey: Physical Conditions and Baryonic Mass in the
Low-Redshift Circumgalactic Medium: We analyze the physical conditions of the cool, photoionized (T $\sim 10^4$
K) circumgalactic medium (CGM) using the COS-Halos suite of gas column density
measurements for 44 gaseous halos within 160 kpc of $L \sim ... | astro-ph |
On the new short orbital period cataclysmic variable Halpha0242-2802: We present results from our phase-resolved spectroscopy of the newly
identified cataclysmic variable Halpha0242-2802. Halpha0242-2802 was identified
from a deep UK Schmidt Halpha-R band survey as a candidate cataclysmic
variable. Although initial spe... | astro-ph |
Modelling the WMAP large-angle anomalies as an effect of a local density
inhomogeneity: We investigate large-angle scale temperature anisotropy in the Cosmic
Microwave Background (CMB) with the Wilkinson Microwave Anisotropy Probe (WMAP)
data and model the large-angle anomalies as the effect of the CMB quadrupole
ani... | astro-ph |
The Nature of LINER-like Emission in Red Galaxies: Passive red galaxies frequently contain warm ionized gas and have spectra
similar to low-ionization nuclear emission-line regions (LINERs). Here we
investigate the nature of the ionizing sources powering this emission, by
comparing nuclear spectroscopy from the Palomar... | astro-ph |
TEMPLATES: Direct Abundance Constraints for Two Lensed Lyman-Break
Galaxies: Using integrated spectra for two gravitationally lensed galaxies from the
JWST TEMPLATES Early Release Science program, we analyze faint auroral lines,
which provide direct measurements of the gas-phase chemical abundance. For the
brighter g... | astro-ph |
Microquasars: Progress made and open questions: In the last talk of the conference I summarized the main progress and
contributions to high energy astrophysics made by studies of microquasars in
our Galaxy. To stimulate the general discussion I have underlined some of the
questions that will guide in the near future th... | astro-ph |
Nested and Single Bars in Seyfert and Non-Seyfert Galaxies: We analyze the observed properties of nested and single stellar bar systems
in disk galaxies. The 112 galaxies in our sample comprise the largest matched
Seyfert vs. non-Seyfert sample of nearby galaxies with complete near-infrared
or optical imaging sensitive... | astro-ph |
The linear response of stellar systems does not diverge at marginal
stability: The linear response of a stellar system's gravitational potential to a
perturbing mass comprises two distinct contributions. Most famously, the system
will respond by forming a polarization 'wake' around the perturber. At the same
time, th... | astro-ph |
Cosmological constraints from 21cm surveys after reionization: 21cm emission from residual neutral hydrogen after the epoch of reionization
can be used to trace the cosmological power spectrum of density fluctuations.
Using a Fisher matrix formulation, we provide a detailed forecast of the
constraints on cosmological p... | astro-ph |
The relation between 13CO(2-1) line width in molecular clouds and
bolometric luminosity of associated IRAS sources: We search for evidence of a relation between properties of young stellar
objects (YSOs) and their parent molecular clouds to understand the initial
conditions of high-mass star formation. A sample of 13... | astro-ph |
A Comparative Analysis of Machine-learning Models for Solar Flare
Forecasting: Identifying High-performing Active Region Flare Indicators: Solar flares create adverse space weather impacting space and Earth-based
technologies. However, the difficulty of forecasting flares, and by extension
severe space weather, is ac... | astro-ph |
Testing the accuracy of radiative cooling approximations in SPH
simulations: Hydrodynamical simulations of star formation have stimulated a need to
develop fast and robust algorithms for evaluating radiative cooling. Here we
undertake a critical evaluation of what is currently a popular method for
prescribing cooling... | astro-ph |
Computation of atomic astrophysical opacities: The revision of the standard Los Alamos opacities in the 1980-1990s by a
group from the Lawrence Livermore National Laboratory (OPAL) and the Opacity
Project (OP) consortium was an early example of collaborative big-data science,
leading to reliable data deliverables (atom... | astro-ph |
A rival for Babcock's star: the extreme 30-kG variable magnetic field in
the Ap star HD 75049: The extraordinary magnetic Ap star HD75049 has been studied with data
obtained with the ESO VLT and 2.2-m telescopes. Direct measurements reveal that
the magnetic field modulus at maximum reaches 30kG. The star shows photom... | astro-ph |
Theoretical aspects of asteroseismology: small steps towards a golden
future: The current status of asteroseismic studies is here reviewed and the adequate
techniques of analysis available today for the study of the oscillation
frequencies are presented. Comments on prospects for future investigations
through the pos... | astro-ph |
The Dilaton and Modified Gravity: We consider the dilaton in the strong string coupling limit and elaborate on
the original idea of Damour and Polyakov whereby the dilaton coupling to matter
has a minimum with a vanishing value at finite field-value. Combining this type
of coupling with an exponential potential, the ef... | astro-ph |
Search for an annual modulation of dark-matter signals with a germanium
spectrometer at the Sierra Grande Laboratory: Data collected during three years with a germanium spectrometer at the Sierra
Grande underground laboratory have been analyzed for distinctive features of
annual modulation of the signal induced by WI... | astro-ph |
The Early-time Optical Properties of Gamma-Ray Burst Afterglows: We present a multiwavelength analysis of 63 Gamma-Ray Bursts observed with
the world's three largest robotic optical telescopes, the Liverpool and Faulkes
Telescopes (North and South). Optical emission was detected for 24 GRBs with
brightnesses ranging fr... | astro-ph |
Systematically Measuring Ultra-Diffuse Galaxies (SMUDGes). II. Expanded
Survey Description and the Stripe 82 Catalog: We present 226 large ultra-diffuse galaxy (UDG) candidates ($r_e >
5.3$\arcsec, $\mu_{0,g} > 24$ mag arcsec$^{-2}$) in the SDSS Stripe 82 region
recovered using our improved procedure developed in ant... | astro-ph |
The First Two Years of Electromagnetic Follow-Up with Advanced LIGO and
Virgo: We anticipate the first direct detections of gravitational waves (GWs) with
Advanced LIGO and Virgo later this decade. Though this groundbreaking technical
achievement will be its own reward, a still greater prize could be observations
of ... | astro-ph |
COMPTEL observations of the quasar PKS 0528+134 during the first 3.5
years of the CGRO mission: The COMPTEL observations of the blazar-type quasar PKS 0528+134 in the energy
range 0.75 MeV to 30 MeV carried out between April 1991 and September 1994 have
been analyzed. During the first two years PKS 0528+134 was most ... | astro-ph |
Temperature measurements with the relativistic Sunyaev-Zel'dovich effect: At temperatures above ~5 keV, the non-relativistic approximation used to
derive the classical thermal Sunyaev-Zel'dovich effect spectrum begins to fail.
When relativistic effects are included, the spectrum becomes
temperature-dependent. This lead... | astro-ph |
Parameter estimation for coalescing massive binary black holes with LISA
using the full 2-post-Newtonian gravitational waveform and spin-orbit
precession: With one exception, previous analyses of the measurement accuracy of
gravitational wave experiments for comparable-mass binary systems have
neglected either spin... | astro-ph |
Observable tests of self-interacting dark matter in galaxy clusters: BCG
wobbles in a constant density core: Models of Cold Dark Matter predict that the distribution of dark matter in
galaxy clusters should be cuspy, centrally concentrated. Constant density cores
would be strong evidence for beyond-CDM physics, such ... | astro-ph |
Star formation history and environment of the dwarf galaxy UGCA 92: We present a quantitative star formation history of the nearby dwarf galaxy
UGCA 92. This irregular dwarf is situated in the vicinity of the Local Group of
galaxies in a zone of strong Galactic extinction (IC 342 group of galaxies).
The galaxy was reso... | astro-ph |
Upturn observed in heavy nuclei to iron ratios by the ATIC-2 experiment: The ratios of fluxes of heavy nuclei from sulfur (Z=16) to chromium (Z=24) to
the flux of iron were measured by the ATIC-2 experiment. The ratios are
decreasing functions of energy from 5 GeV/n to approximately 80 GeV/n, as
expected. However, an u... | astro-ph |
Revisiting the Integrated Star Formation Law. Paper I: Non-Starbursting
Galaxies: We use new and updated gas and dust-corrected SFR surface densities to
revisit the integrated star formation law for local "quiescent" spiral, dwarf,
and low-surface-brightness galaxies. Using UV-based SFRs with individual
IR-based dust... | astro-ph |
The X-ray Telescope of the CAST Experiment: The CERN Axion Solar Telescope (CAST) searches for solar axions employing a 9
Tesla superconducting dipole magnet equipped with 3 independent detection
systems for X-rays from axion-photon conversions inside the 10 m long magnetic
field. Results of the first 6 months of data ... | astro-ph |
Differences between CO- and calcium triplet-derived velocity dispersions
in spiral galaxies: evidence for central star formation?: We examine the stellar velocity dispersions (sigma) of a sample of 48
galaxies, 35 of which are spirals, from the Palomar nearby galaxy survey. It is
known that for ultra-luminous infrare... | astro-ph |
Minimal tau approximation and simulations of the alpha effect: The validity of a closure called the minimal tau approximation (MTA), is
tested in the context of dynamo theory, wherein triple correlations are assumed
to provide relaxation of the turbulent electromotive force. Under MTA, the
alpha effect in mean field dy... | astro-ph |
Accretion Flow Along a Dipolar Field: Application to Intermediate Polars: A hydrodynamic formulation for accretion flow channeled by a dipolar magnetic
field is constructed using a curvi-linear coordinate system natural to the
field structure. We solve the hydrodynamic equations and determine the
velocity, density and ... | astro-ph |
All NIRspec needs is HST/WFC3 pre-imaging? The use of Milky Way Stars in
WFC3 Imaging to Register NIRspec MSA Observations: The James Webb Space Telescope (JWST) will be an exquisite new near-infrared
observatory with imaging and multi-object spectroscopy through ESA's NIRspec
instrument with its unique Micro-Shutter... | astro-ph |
A Comparison of Semi-Analytic and Smoothed Particle Hydrodynamics Galaxy
Formation: We compare the statistical properties of galaxies found in two different
models of hierarchical galaxy formation: the semi-analytic model of Cole et al.
and the smoothed particle hydrodynamics (SPH) simulations of Pearce et al.
Using ... | astro-ph |
Modes of Accretion in X-ray Sources: Three classical modes of accretion are briefly discussed: wind-fed,
spherical, and disk. The three modes are illustrated with the mass transfer
onto black holes in high-mass X-ray binaries. Then a new regime of mini-disk
accretion is described and it is argued that observed wind-fed... | astro-ph |
Is there a correlation between radio and gamma ray luminosities of AGN ?: The possibility of a correlation between the radio (cm)- and $\gamma$-ray
luminosity of variable AGN seen by EGRET is investigated. We performed
Monte-Carlo simulations of typical data sets and applied different correlation
techniques (partial co... | astro-ph |
Glancing through the debris disk: Photometric analysis of DE Boo with
CHEOPS: DE Boo is a unique system, with an edge-on view through the debris disk
around the star. The disk, which is analogous to the Kuiper belt in the Solar
System, was reported to extend from 74 to 84 AU from the central star. The high
photometri... | astro-ph |
New approach to primary mass composition analysis with simultaneous use
of ground and fluorescence detectors data: We study the possibility to reconstruct primary mass composition with the use
of combinations of basic shower characteristics, measured in hybrid
experiments, such as depth of shower maximum from fluores... | astro-ph |
The metallicity dependence of WR wind models: With the advance of stellar atmosphere modelling during the last few years,
large progress in the understanding of Wolf-Rayet (WR) mass loss has been
achieved. In the present paper we review the most recent developments,
including our own results from hydrodynamic non-LTE m... | astro-ph |
A numerical approach to stochastic inflation and primordial black holes: Certain models of cosmic inflation produce strong cosmological perturbations
at short length scales, which may later collapse into primordial black holes.
To find the statistics of these strong perturbations and the ensuing black
holes, it is nece... | astro-ph |
CosTuuM: polarized thermal dust emission by magnetically oriented
spheroidal grains: We present the new open source C++-based Python library CosTuuM that can be
used to generate infrared absorption and emission coefficients for arbitrary
mixtures of spheroidal dust grains that are (partially) aligned with a magnetic
... | astro-ph |
The smooth cyclotron line in Her X-1 as seen with NuSTAR: Her X-1, one of the brightest and best studied X-ray binaries, shows a
cyclotron resonant scattering feature (CRSF) near 37 keV. This makes it an
ideal target for detailed study with the Nuclear Spectroscopic Telescope Array
(NuSTAR), taking advantage of its exc... | astro-ph |
Flashes in a Star Stream: Automated Classification of Astronomical
Transient Events: An automated, rapid classification of transient events detected in the modern
synoptic sky surveys is essential for their scientific utility and effective
follow-up using scarce resources. This presents some unusual challenges: the
d... | astro-ph |
A New 100-GHz Band Front-End System with a Waveguide-Type
Dual-Polarization Sideband-Separating SIS Receiver for the NRO 45-m Radio
Telescope: We developed a waveguide-type dual-polarization sideband-separating SIS
receiver system of the 100-GHz band for the 45-m radio telescope at the
Nobeyama Radio Observatory, J... | astro-ph |
A Complete Census of Circumgalactic MgII at Redshift z<~ 0.5: We present a survey of MgII absorbing gas in the vicinity of 380 random
galaxies, using 156 background quasi-stellar objects(QSOs) as absorption-line
probes. The sample comprises 211 isolated (73 quiescent and 138 star-forming
galaxies) and 43 non-isolated g... | astro-ph |
Quiescent Ultra-diffuse galaxies in the field originating from
backsplash orbits: Ultra-diffuse galaxies (UDGs) are the lowest-surface brightness galaxies
known, with typical stellar masses of dwarf galaxies but sizes similar to
larger galaxies like the Milky Way. The reason for their extended sizes is
debated, with ... | astro-ph |
Suzaku Metal Abundance Patterns in the Outflow Region of M82 and the
Importance of Charge Exchange: We performed spectral analysis of Suzaku data of the galactic disk and
outflow regions of the starburst galaxy M82. Thermal modeling of the central
disk regions requires at least three temperature components. The Ly$\b... | astro-ph |
The structure of steady, relativistic, magnetised jets with rotation: We present equilibrium models of relativistic magnetised, infinite,
axisymmetric jets with rotation propagating through an homogeneous,
unmagnetised ambient medium at rest. The jet models are characterised by six
functions defining the radial profile... | astro-ph |
Core collapse supernovae as Cosmic Ray sources: Core collapse supernovae (CCSNe) produce fast shocks which pervade the dense
circum-stellar medium (CSM) of the stellar progenitor. Cosmic rays (CRs) if
accelerated at these shocks can induce the growth of electromagnetic
fluctuations in the foreshock medium. In this stud... | astro-ph |
Polarized QED Cascades over Pulsar Polar Caps: The formation of $e^\pm$ plasmas within pulsar magnetospheres through quantum
electrodynamics (QED) cascades in vacuum gaps is widely acknowledged. This
paper aims to investigate the effect of photon polarization during the QED
cascade occurring over the polar cap of a pul... | astro-ph |
Analyzing spatial coherence using a single mobile field sensor: According to the Van Citter-Zernike theorem the intensity distribution of a
spatially incoherent source and the mutual coherence function of the light
impinging on two wave sensors are related. It is the comparable relationship
using a single mobile sensor... | astro-ph |
Radiation-Dominated Disks Are Thermally Stable: When the accretion rate is more than a small fraction of Eddington, the inner
regions of accretion disks around black holes are expected to be
radiation-dominated. However, in the alpha-model, these regions are also
expected to be thermally unstable. In this paper, we rep... | astro-ph |
Velocity-dependent J-factors for annihilation radiation from
cosmological simulations: We determine the dark matter pair-wise relative velocity distribution in a
set of Milky Way-like halos in the Auriga and APOSTLE simulations. Focusing on
the smooth halo component, the relative velocity distribution is well-describ... | astro-ph |
Radiation Magnetohydrodynamics Simulation of Proto-Stellar Collapse:
Two-Component Molecular Outflow: We perform a three-dimensional nested-grid radiation magneto-hydrodynamics
(RMHD) simulation with self-gravity to study the early phase of the low-mass
star formation process from a rotating molecular cloud core to a... | astro-ph |
Balmer line shifts in quasars: We offer a broad review of Balmer line phenomenology in type 1 active
galactic nuclei, briefly sum- marising luminosity and radio loudness effects,
and discussing interpretation in terms of nebular physics along the 4D
eigenvector 1 sequence of quasars. We stress that relatively rare, pec... | astro-ph |
The velocity dispersion and mass-to-light ratio of the remote halo
globular cluster NGC 2419: Precise radial velocity measurements from HIRES on the Keck I telescope are
presented for 40 stars in the outer halo globular cluster NGC 2419. These data
are used to probe the cluster's stellar mass function and search for ... | astro-ph |
The JCMT Gould Belt Survey: Evidence for Dust Grain Evolution in Perseus
Star-forming Clumps: The dust emissivity spectral index, $\beta$, is a critical parameter for
deriving the mass and temperature of star-forming structures, and consequently
their gravitational stability. The $\beta$ value is dependent on various... | astro-ph |
Galaxy and Mass Assembly (GAMA): Optimal Tiling of Dense Surveys with a
Multi-Object Spectrograph: A heuristic greedy algorithm is developed for efficiently tiling spatially
dense redshift surveys. In its first application to the Galaxy and Mass
Assembly (GAMA) redshift survey we find it rapidly improves the spatial
... | astro-ph |
Exploring the Properties of the M31 Halo Globular Cluster System: Following on from our discovery of a significant population of M31 outer halo
globular clusters (GCs), and updates to the Revised Bologna Catalogue of M31
GCs, we investigate the GC system of M31 out to an unprecedented radius
(~120kpc). We derive variou... | astro-ph |
Large-amplitude rapid X-ray variability in the narrow-line Seyfert 1
galaxy PG 1404$+$226: We present the first results from a detailed analysis of a new, long
($\sim100$ ks) XMM-Newton observation of the narrow-line Seyfert 1 galaxy PG
1404$+$226 which showed a large-amplitude, rapid X-ray variability by a factor
of... | astro-ph |
Spitzer observations of NGC2264: The nature of the disk population: NGC2264 is a young cluster with a rich circumstellar disk population which
makes it an ideal target for studying the evolution of stellar clusters. Our
goal is to study its star formation history and to analyse the primordial disk
evolution of its memb... | astro-ph |
Quantum sensor networks as exotic field telescopes for multi-messenger
astronomy: Multi-messenger astronomy, the coordinated observation of different classes
of signals originating from the same astrophysical event, provides a wealth of
information about astrophysical processes with far-reaching implications. So
far,... | astro-ph |
Perspectives for multi-messenger astronomy with the next generation of
gravitational-wave detectors and high-energy satellites: The Einstein Telescope (ET) is going to bring a revolution for the future of
multi-messenger astrophysics. In order to detect the counterparts of binary
neutron star (BNS) mergers at high re... | astro-ph |
Accuracy of Mesh Based Cosmological Hydrocodes: Tests and Corrections: We perform a variety of tests to determine the numerical resolution of the
cosmological TVD eulerian code developed by Ryu et al (1993). Tests include
512^3 and 256^3 simulations of a Pk=k^{-1} spectrum to check for
self-similarity and comparison of... | astro-ph |
Extreme Jet Ejections from the Black Hole X-ray Binary V404 Cygni: We present simultaneous radio through sub-mm observations of the black hole
X-ray binary (BHXB) V404 Cygni during the most active phase of its June 2015
outburst. Our $4$ hour long set of overlapping observations with the Very Large
Array, the Sub-milli... | astro-ph |
Broad-Band Imaging of a Large Sample of Irregular Galaxies: We present the results of UBV imaging of a large sample of irregular
galaxies: 94 Im systems, 24 Blue Compact Dwarfs (BCDs), and 18 Sm galaxies. We
also include JHK imaging of 41 of these galaxies. The sample spans a large
range in galactic parameters. Ellipse... | astro-ph |
Lyman-Werner UV Escape Fractions from Primordial Halos: Population III stars can regulate star formation in the primordial Universe
in several ways. They can ionize nearby halos, and even if their ionizing
photons are trapped by their own halos, their Lyman-Werner (LW) photons can
still escape and destroy H$_2$ in othe... | astro-ph |
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