PhysBERT
Collection
7 items • Updated • 1
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Imprints of deviations from the gravitational inverse-square law on the
power spectrum of mass fluctuations: Deviations from the gravitational inverse-square law would imprint
scale-dependent features on the power spectrum of mass density fluctuations. We
model such deviations as a Yukawa-like contribution to the gra... | astro-ph |
A New Weak Lensing Analysis of MS1224.7+2007: Galaxy cluster mass distributions are useful probes of Omega_0 and the nature
of the dark matter. Large clusters will distort the observed shapes of
background galaxies through gravitational lensing allowing the measurement of
the cluster mass distributions. For most cases,... | astro-ph |
Spherical Gravitational Collapse of Annihilating Dark Matter and the
Minimum Mass of CDM Black Holes: Spherical gravitational collapse of a cold gas of annihilating particles
involves a competition between the free-fall rate $\propto\sqrt{\rho}$ and the
(s-wave) annihilation rate $\propto\rho$. Thus, there is a criti... | astro-ph |
An outflow powers the optical rise of the nearby, fast-evolving tidal
disruption event AT2019qiz: At 66 Mpc, AT2019qiz is the closest optical tidal disruption event (TDE) to
date, with a luminosity intermediate between the bulk of the population and
iPTF16fnl. Its proximity allowed a very early detection and triggeri... | astro-ph |
PyTransit: Fast and Easy Exoplanet Transit Modelling in Python: We present a fast and user friendly exoplanet transit light curve modelling
package PyTransit, implementing optimised versions of the Gimen\'ez and the
Mandel & Agol transit models. The package offers an object-oriented Python
interface to access the two m... | astro-ph |
Formation of spiral structure from the violent relaxation of
self-gravitating disks: We present the numerical study of the formation of spiral structure in the
context of violent relaxation. Initial conditions are the out-of-equilibrium
disks of self-gravitating particles in rigid rotation. By that mechanism,
robust ... | astro-ph |
The Nature of Nearby Counterparts to Intermediate Redshift Luminous
Compact Blue Galaxies II. CO Observations: We present the results of a single-dish beam-matched survey of the three
lowest rotational transitions of CO in a sample of 20 local (D < 70 Mpc)
Luminous Compact Blue Galaxies (LCBGs). These ~L*, blue, high... | astro-ph |
Short gamma-ray burst jet propagation in binary neutron star merger
environments: The multimessenger event GW170817/GRB 170817A confirmed that binary neutron
star (BNS) mergers can produce short gamma-ray burst (SGRB) jets. This evidence
promoted new investigations on the mechanisms through which a BNS merger
remnant... | astro-ph |
Long-term gamma-ray observations of the binary HESS J0632+057 with
H.E.S.S., MAGIC and VERITAS: The gamma-ray binary HESS J0632+057 has been observed at very-high energies
(E $>$ 100 GeV) for more than ten years by the major systems of imaging
atmospheric Cherenkov telescopes. We present a summary of results obtained... | astro-ph |
The growth rate of cosmic structures in the local Universe with the
ALFALFA survey: We investigate the growth rate of structures in the local Universe. For this,
we use as a cosmological tracer the HI line extra-galactic sources from the
Arecibo Legacy Fast ALFA (ALFALFA) survey to obtain a measurement of the
normali... | astro-ph |
Multi-scale Dust Polarization and Spiral-like Stokes-I Residual in the
Class I Protostellar System TMC-1A: We have observed the Class I protostar TMC-1A in the Taurus molecular cloud
using the Submillimeter Array (SMA) and the Atacama Large
Millimeter/submillimeter Array (ALMA) in the linearly polarized 1.3 mm
contin... | astro-ph |
Baseline correction for FAST radio recombination lines: a modified
penalized least squares smoothing technique: A pilot project has been proceeded to map 1 deg$^2$ on the Galactic plane for
radio recombination lines (RRLs) using the Five hundred meter Aperture
Spherical Telescope (FAST). The motivation is to verify t... | astro-ph |
Outflowing disk formation in B[e] supergiants due to rotation and
bi--stability in radiation driven winds: The effects of rapid rotation and bi-stability upon the density contrast
between the equatorial and polar directions of a B[e] supergiant are
re-investigated. Based upon a new slow solution for different high ro... | astro-ph |
The ESO Nearby Abell Cluster Survey IX. The morphology-radius and
morphology-density relations in rich galaxy clusters: We study the morphology-radius (MR-) and morphology-density (MD-) relations
for a sample of about 850 galaxies (with M <= -19.5) in 23 clusters from the
ENACS (ESO Nearby Abell Cluster Survey). On t... | astro-ph |
Distances of Quasars and Quasar-Like Galaxies: Further Evidence that
QSOs may be Ejected from Active Galaxies: If high-redshift QSOs are ejected from the nuclei of low-redshift galaxies,
as some have claimed, a large portion of their redshift must be intrinsic
(non-Doppler). If these intrinsic components have preferr... | astro-ph |
Probing the dynamical state of galaxy clusters: We show how hydrostatic equilibrium in galaxy clusters can be quantitatively
probed combining X-ray, SZ, and gravitational-lensing data. Our previously
published method for recovering three-dimensional cluster gas distributions
avoids the assumption of hydrostatic equilib... | astro-ph |
Kilonova Light-Curve Interpolation with Neural Networks: Kilonovae are the electromagnetic transients created by the radioactive decay
of freshly synthesized elements in the environment surrounding a neutron star
merger. To study the fundamental physics in these complex environments,
kilonova modeling requires, in part... | astro-ph |
Optical technologies for the observation of low Earth orbit objects: In order to avoid collisions with space debris, the near Earth orbit must be
continuously scanned by either ground- or spaced-based facilities. For the low
Earth orbit, radar telescopes are the workhorse for this task, especially due
to their continuo... | astro-ph |
Hector - a new massively multiplexed IFS instrument for the
Anglo-Australian Telescope: Hector will be the new massively-multiplexed integral field spectroscopy
(IFS) instrument for the Anglo-Australian Telescope (AAT) in Australia and the
next main dark-time instrument for the observatory. Based on the success of th... | astro-ph |
NBFTP: A Dedicated Data Transfer System for Remote Astronomical
Observation at Dome A: Dome A, Antarctica has been thought to be one of the best astronomical sites
on the earth since decades ago. From it was first visited by astronomers in
2008, dozens of facilities for astronomical observation and site testing were
... | astro-ph |
Rapid Dissipation of Protoplanetary Disks in Ophiuchus: We present the results of an age determination study for pre-main sequence
stars in the Ophiuchus molecular cloud. The ages of eight pre-main sequence
stars were estimated from surface gravities derived from high-resolution
spectroscopy. The average age of the tar... | astro-ph |
Kinematics of OB Stars with Data from the LAMOST and Gaia Catalogues: We have analyzed the kinematics of OB stars from the list by Xiang et al.
(2021) that contains $\sim$13 000 single OB stars. For these stars there are
photometric distance estimates and proper motions from the Gaia catalogue and
line-of-sight velocit... | astro-ph |
Accretion-disc model spectra for dwarf-nova stars: Radiation from accretion discs in cataclysmic variable stars (CVs) provides
fundamental information about the properties of these close binary systems and
about the physics of accretion in general. The detailed diagnostics of
accretion disc structure can be achieved by... | astro-ph |
Time-Variable Jet Ejections from RW Aur A, RY Tau and DG Tau: We present Gemini-NIFS, VLT-SINFONI and Keck-OSIRIS observations of
near-infrared [Fe II] emission associated with the well-studied jets from three
active T Tauri stars; RW Aur A, RY Tau and DG Tau taken from 2012-2021. We
primarily covered the redshifted je... | astro-ph |
Monte Carlo simulations of alternative sky observation modes with the
Cherenkov Telescope Array: We investigate possible sky survey modes with the Middle Sized Telescopes
(MST, aimed at covering the energy range from $\sim$100 GeV to 10 TeV)
subsystem of the Cherenkov Telescope Array (CTA). We use the standard CTA
to... | astro-ph |
Radio Polarimetry Results for Young Southern Pulsars: We present radio polarimetry results for nine Southern pulsars. Six of the
nine are young, with characteristic ages less than 100 kyr and high spin-down
luminosities. All six show significant linear polarization, and we confirm a
previously noticed trend in which th... | astro-ph |
Raytracing simulations of coupled dark energy models: Dark matter and dark energy are usually assumed to couple only
gravitationally. An extension to this picture is to model dark energy as a
scalar field coupled directly to cold dark matter. This coupling leads to new
physical effects, such as a fifth-force and a time... | astro-ph |
Discovery of a bright microlensing event with planetary features towards
the Taurus region: a super Earth planet: The transient event labeled as TCP J05074264+2447555 recently discovered
towards the Taurus region was quickly recognized to be an ongoing microlensing
event on a source located at distance of only $700-8... | astro-ph |
Cold dark matter heats up: One of the principal discoveries in modern cosmology is that standard model
particles (including baryons, leptons and photons) together comprise only 5% of
the mass-energy budget of the Universe. The remaining 95% consists of dark
energy and dark matter (DM). Consequently our picture of the u... | astro-ph |
Estimating the impact of recombination uncertainties on the cosmological
parameter constraints from cosmic microwave background experiments: [Abridged] We use our most recent training set for the RICO code to estimate
the impact of recombination uncertainties on the posterior probability
distributions which will be o... | astro-ph |
The Robo-AO-2 facility for rapid visible/near-infrared AO imaging and
the demonstration of hybrid techniques: We are building a next-generation laser adaptive optics system, Robo-AO-2,
for the UH 2.2-m telescope that will deliver robotic, diffraction-limited
observations at visible and near-infrared wavelengths in un... | astro-ph |
Towards a multi-scale understanding of the gas-star formation cycle in
the Central Molecular Zone: The Central Molecular Zone (CMZ, the central 500 pc of the Milky Way)
contains the largest reservoir of high-density molecular gas in the Galaxy, but
forms stars at a rate 10-100 times below commonly-used star formation... | astro-ph |
Variability of VHE $γ$-ray emission from the binary PSR B1259-63/LS
2883: We examine changes of the $\gamma$-ray intensity observed from the direction
of the binary system PSR B1259-63/LS 2883 during campaigns around its three
periastron passages. A simple and straightforward method is applied to the
published data o... | astro-ph |
EMPRESS. IV. Extremely Metal-Poor Galaxies (EMPGs) Including Very
Low-Mass Primordial Systems with M*=10^4--10^5 M_sun and 2--3% (O/H)_sun:
High (Fe/O) Suggestive of Metal Enrichment by Hypernovae/Pair-Instability
Supernovae: We present Keck/LRIS follow-up spectroscopy for 13 photometric candidates of
extremely m... | astro-ph |
The dust effects on galaxy scaling relations: Accurate galaxy scaling relations are essential for a successful model of
galaxy formation and evolution as they provide direct information about the
physical mechanisms of galaxy assembly over cosmic time. We present here a
detailed analysis of a sample of nearby spiral ga... | astro-ph |
Predicted Colors and Flux Densities of Protostars in the Herschel PACS
and SPIRE Filters: Upcoming surveys with the Herschel Space Observatory will yield far-IR
photometry of large samples of young stellar objects, which will require
careful interpretation. We investigate the color and luminosity diagnostics
based on... | astro-ph |
Evidence for an X-ray Emitting Galactic Bulge: Shadows Cast by Distant
Molecular Gas: A mosaic of 7 ROSAT PSPC pointed observations in the direction of (l,b ~ 10,0
deg) reveals deep X-ray shadows in the 0.5-2.0 keV band cast by dense molecular
gas. The comparison between the observed on-cloud and off-cloud X-ray flux... | astro-ph |
Deep Learning for Gamma-Ray Bursts: A data driven event framework for
X/Gamma-Ray analysis in space telescopes: This thesis comprises the first three chapters dedicated to providing an
overview of Gamma Ray-Bursts (GRBs), their properties, the instrumentation used
to detect them, and Artificial Intelligence (AI) appl... | astro-ph |
Making the unmodulated Pyramid wavefront sensor smart. Closed-loop
demonstration of neural network wavefront reconstruction with MagAO-X: Almost all current and future high-contrast imaging instruments will use a
Pyramid wavefront sensor (PWFS) as a primary or secondary wavefront sensor. The
main issue with the PWFS ... | astro-ph |
Relationship between the moment of inertia and the $k_2$ Love number of
fluid extra-solar planets: Context: Tidal and rotational deformation of fluid giant extra-solar planets
may impact their transit light curves, making the $k_2$ Love number observable
in the upcoming years. Studying the sensitivity of $k_2$ to mas... | astro-ph |
The Completed SDSS-IV Extended Baryon Oscillation Spectroscopic Survey:
N-body Mock Challenge for the Quasar Sample: The growth rate and expansion history of the Universe can be measured from
large galaxy redshift surveys using the Alcock-Paczynski effect. We validate
the Redshift Space Distortion models used in the ... | astro-ph |
A Massive Millisecond Pulsar in an Eccentric Binary: The recent discovery of a population of eccentric (e ~ 0.1) millisecond
pulsar (MSP) binaries with low-mass white dwarf companions in the Galactic
field represents a challenge to evolutionary models that explain MSP formation
as recycling: all such models predict tha... | astro-ph |
Spatially Resolved Stellar Populations of $0.3<z<6.0$ Galaxies in
WHL0137-08 and MACS0647+70 Clusters as Revealed by JWST: How do Galaxies Grow
and Quench Over Cosmic Time?: We study the spatially resolved stellar populations of 444 galaxies at
$0.3<z<6.0$ in two clusters (WHL0137-08 and MACS0647+70) and a blank fi... | astro-ph |
Pulse profiles from thermally emitting neutron stars: The problem of computing the pulse profiles from thermally emitting spots on
the surface of a neutron star in general relativity is reconsidered. We show
that it is possible to extend Beloborodov (2002) approach to include (multiple)
spots of finite size in differen... | astro-ph |
Prevailing dust-transport directions on comet 67P/Churyumov-Gerasimenko: Dust transport and deposition behind larger boulders on the comet
67P/Churyumov-Gerasimenko (67P/C-G) have been observed by the Rosetta mission.
We present a mechanism for dust transport vectors based on a homogenous surface
activity model incorpo... | astro-ph |
How many low-mass stars do destroy 3He?: We recall the current status of the long-standing 3He problem, and its
possible connection with chemical anomalies on the red giant branch. In this
context, we collect in the literature all the available observations of the
carbon isotopic ratio in field and cluster giant stars.... | astro-ph |
Spitzer Observations of V838 Monocerotis: Detection of a Rare Infrared
Light Echo: We present Spitzer observations of the unusual variable V838 Monocerotis.
Extended emission is detected around the object at 24, 70 and 160um. The
extended infrared emission is strongly correlated spatially with the HST
optical light e... | astro-ph |
How to make maps from CMB data without losing information: The next generation of CMB experiments can measure cosmological parameters
with unprecedented accuracy - in principle. To achieve this in practice when
faced with such gigantic data sets, elaborate data analysis methods are needed
to make it computationally fea... | astro-ph |
Molecular Gas in the Inner 3.2 Kiloparsecs of NGC 2403: Star Formation
at Subcritical Gas Surface Densities: We present a fully sampled map of the inner 3.2 kpc of the nearby spiral
galaxy NGC 2403 in the CO J=1-0 line. These data emphasize the relatively small
contribution of molecular hydrogen to the cold gas conte... | astro-ph |
Interaction of massive black hole binaries with their stellar
environment: III. Scattering of bound stars: We develop a formalism for studying the dynamics of massive black hole
binaries embedded in gravitationally-bound stellar cusps, and study the binary
orbital decay by three-body interactions, the impact of stell... | astro-ph |
Wavelet analysis of MCG-6-30-15 and NGC 4051: a possible discovery of
QPOs in 2:1 and 3:2 resonance: Following our previous work of Lachowicz & Czerny (2005), we explore further
the application of the continuous wavelet transform to X-ray astronomical
signals. Using the public archive of the XMM-Newton satellite, we ... | astro-ph |
Alternating Direction Implicit Method for Two-Dimensional Fokker-Planck
Equation of Dense Spherical Stellar Systems: The Fokker-Planck (FP) model is one of the commonly used methods for studies
of the dynamical evolution of dense spherical stellar systems such as globular
clusters and galactic nuclei. The FP model is... | astro-ph |
Optimal limits on f_{NL}^{local} from WMAP 5-year data: We have applied the optimal estimator for f_{NL}^{local} to the 5 year WMAP
data. Marginalizing over the amplitude of foreground templates we get -4 <
f_{NL}^{local} < 80 at 95% CL. Error bars of previous (sub-optimal) analyses
are roughly 40% larger than these. T... | astro-ph |
Solution to the conflict between the resolved and unresolved galaxy
stellar mass estimation from the perspective of JWST: By utilizing the spatially-resolved photometry of galaxies at $0.2<z<3.0$ in
the CEERS field, we estimate the resolved and unresolved stellar mass via
spectral energy distribution (SED) fitting to... | astro-ph |
3-D simulations of shells around massive stars: As massive stars evolve, their winds change. This causes a series of
hydrodynamical interactions in the surrounding medium. Whenever a fast wind
follows a slow wind phase, the fast wind sweeps up the slow wind in a shell,
which can be observed as a circumstellar nebula.
... | astro-ph |
Determination of dark matter type by X-ray sources statistics: The current cosmological model includes cold dark matter, which consists of
massive nonrelativistic particles. There are also some observational and
theoretical evidences for warm dark matter. The existence of warm DM can be
examined by measuring of the gal... | astro-ph |
UVES observations of QSO 0000-2620: oxygen and zinc abundances in the
Damped Ly-alpha galaxy at z_abs=3.3901: Observations of the QSO 0000-2620 with UVES spectrograph at the 8.2m ESO
KUEYEN telescope are used for abundance analysis of the damped Ly-alpha system
at z_{abs}=3.3901. Several Oxygen lines are identified i... | astro-ph |
3D mapping of the neutral X-ray absorption in the local interstellar
medium: The Gaia and XMM-Newton synergy: We present a three-dimensional map of the hydrogen density distribution in
the Galactic interstellar medium. The hydrogen equivalent column densities were
obtained from the Exploring the X-ray Transient and v... | astro-ph |
CMB Polarization in Einstein-Aether Theory: We study the impact of modifying the vector sector of gravity on the CMB
polarization. We employ the Einstein-aether theory as a concrete example. The
Einstein-aether theory admits dynamical vector perturbations generated during
inflation, leaving imprints on the CMB polariza... | astro-ph |
A Disc Reflection Model for Ultra-Soft Narrow-Line Seyfert 1 Galaxies: We present a detailed analysis of the XMM-Newton observations of five
narrow-line Seyfert 1 galaxies (NLS1s). They all show very soft continuum
emission in the X-ray band with a photon index of $\Gamma\gtrsim 2.5$.
Therefore, they are referred to as... | astro-ph |
Radio Polarimetry of the ELAIS N1 Field: Polarized Compact Sources: We present deep polarimetric observations at 1420 MHz of the European Large
Area ISO Survey North 1 region (ELAIS N1) as part of the Dominion Radio
Astrophysical Observatory Planck Deep Fields project. By combining closely
spaced aperture synthesis fie... | astro-ph |
A Stellar Flare during the Transit of the Extrasolar Planet OGLE-TR-10b: We report a stellar flare occurring during a transit of the exoplanet
OGLE-TR-10b, an event not previously reported in the literature. This reduces
the observed transit depth, particularly in the u'-band, but flaring could also
be significant in o... | astro-ph |
Evidence for Black Hole Growth in Local Analogs to Lyman Break Galaxies: We have used XMM-Newton to observe six Lyman Break Analogs (LBAs): members of
the rare population of local galaxies that have properties that are very
similar to distant Lyman Break Galaxies. Our six targets were specifically
selected because they... | astro-ph |
Non-parametric Reconstruction of Photon Escape Fraction from
Reionization: One of the most crucial yet poorly constrained parameters in modelling the
ionizing emissivity is the escape fraction of photons from star-forming
galaxies. Several theoretical and observational studies have been conducted
over the past few ye... | astro-ph |
Magnetized, Relativistic Jets: Extragalactic relativistic jets are composed by charged particles and
magnetic fields, as inferred from the synchrotron emission that we receive from
them. The Larmor radii of the particles propagating along the magnetic field
are much smaller than the scales of the problem, providing the... | astro-ph |
Thermal Convection in Stars and in Their Atmosphere: Thermal convection is one of the main mechanisms of heat transport and mixing
in stars in general and also in the photospheric layers which emit the
radiation that we observe with astronomical instruments. The present lecture
notes first introduce the role of convect... | astro-ph |
A Lagrangian Dynamical Theory for the Mass Function of Cosmic
Structures: I Dynamics: A new theory for determining the mass function of cosmic structures is
presented. It relies on a realistic treatment of collapse dynamics.
Gravitational collapse is analyzed in the Lagrangian perturbative framework.
Lagrangian pertu... | astro-ph |
Equation of state description of the dark energy transition between
quintessence and phantom regimes: The dark energy crossing of the cosmological constant boundary (the
transition between the quintessence and phantom regimes) is described in terms
of the implicitly defined dark energy equation of state. The generali... | astro-ph |
Asteroids and Comets: Asteroids and comets are remnants from the era of Solar System formation over
4.5 billion years ago, and therefore allow us to address two fundamental
questions in astronomy: what was the nature of our protoplanetary disk, and how
did the process of planetary accretion occur? The objects we see to... | astro-ph |
Radio continuum and far-infrared emission from the galaxies in the
Eridanus group: The Eridanus galaxies follow the well-known radio-FIR correlation. Majority
(70%) of these galaxies have their star formation rates below that of the Milky
Way. The galaxies having a significant excess of radio emission are identified
... | astro-ph |
AEGIS: The Morphologies of Green Galaxies at 0.4<z<1.2: We present quantitative morphologies of ~300 galaxies in the
optically-defined green valley at 0.4<z<1.2, in order to constrain the
mechanism(s) responsible for quenching star formation in the bulk of this
population. The sample is selected from galaxies in the Al... | astro-ph |
Finding Planets Around White Dwarf Remnants of Massive Stars: Planet frequency shows a strong positive correlation with host mass from the
hydrogen-burning limit to M ~ 2Msun. No search has yet been conducted for
planets of higher-mass hosts because all existing techniques are insensitive to
these planets. We show that... | astro-ph |
Variability in X-ray line ratios in helium-like ions of massive stars:
the radiation-driven case: Line ratios in "fir" triplets of helium-like ions have proven to be a
powerful diagnostic of conditions in X-ray emitting gas surrounding massive
stars. Recent observations indicate that these ratios can be variable with... | astro-ph |
Charge-sign dependent solar modulation for everyone: We present a tool to compute the influence of charge-sign dependent solar
modulation for cosmic ray spectra. The code is publicly available, easy to use
and offers an extended view on solar modulation compared to the force-field
approximation. We present some example... | astro-ph |
Analyzing X-ray pulsar profiles: geometry and beam pattern of A 0535+26: We applied a decomposition method to the energy dependent pulse profiles of
the accreting binary pulsar A 0535+26, in order to identify the contribution of
the two magnetic poles of the neutron star and to obtain constraints on the
geometry of the... | astro-ph |
The 5 - 10 keV AGN luminosity function at 0.01<z<4.0: The active galactic nuclei X-ray luminosity function traces actively
accreting supermassive black holes and is essential for the study of the
properties of the active galactic nuclei (AGN) population, black hole
evolution, and galaxy-black hole coevolution. Up to no... | astro-ph |
Non-thermal X-ray and Gamma-ray Emission from the Colliding Wind Binary
WR140: WR140 is the archetype long-period colliding wind binary (CWB) system, and is
well known for dramatic variations in its synchrotron emission during its
7.9-yr, highly eccentric orbit. This emission is thought to arise from
relativistic ele... | astro-ph |
The ICECUBE prototype string in AMANDA: The Antarctic Muon And Neutrino Detector Array (Amanda) is a high-energy
neutrino telescope. It is a lattice of optical modules (OM) installed in the
clear ice below the South Pole Station. Each OM contains a photomultiplier tube
(PMT) that detects photons of Cherenkov light gene... | astro-ph |
Updated Proper Motion of the Neutron Star in the Supernova Remnant
Cassiopeia~A: In this paper, we present updated estimates of the velocity of the neutron
star (NS) in the supernova remnant (SNR) Cassiopeia A using over two decades of
Chandra observations. We use two methods: 1.) recording NS positions from
dozens o... | astro-ph |
The Core Mass Function Across Galactic Environments. III. Massive
Protoclusters: The stellar initial mass function (IMF) is fundamental for many areas of
astrophysics, but its origin remains poorly understood. It may be inherited
from the core mass function (CMF) or arise as a result of more chaotic,
competitive accr... | astro-ph |
Solar Energetic Particles and Associated EIT Disturbances in Solar Cycle
23: We explore the link between solar energetic particles (SEPs) observed at 1 AU
and large-scale disturbances propagating in the solar corona, named after the
Extreme ultraviolet Imaging Telescope (EIT) as EIT waves, which trace the
lateral exp... | astro-ph |
The Dynamics of Tightly-packed Planetary Systems in the Presence of an
Outer Planet: case studies using Kepler-11 and Kepler-90: We explore the effects of an undetected outer giant planet on the dynamics,
observability, and stability of Systems with Tightly-packed Inner Planets
(STIPs). We use direct numerical simula... | astro-ph |
Phase-space mixing and the merging of cusps: Collisionless stellar systems are driven towards equilibrium by mixing of
phase-space elements. I show that the excess-mass function D(f)= int_{F(x,v)>f}
(F(x,v)-f) d^3x d^3v (with F(x,v) the coarse-grained distribution function)
always decreases on mixing. D(f) gives the ex... | astro-ph |
Multiple stellar populations in Schwarzschild modeling and the
application to the Fornax dwarf: Dwarf spheroidal (dSph) galaxies are believed to be strongly dark matter
dominated and thus are considered perfect objects to study dark matter
distribution and test theories of structure formation. They possess resolved,
... | astro-ph |
Sources of X-rays from galaxies: Galactic X-ray emission is a manifestation of various high-energy phenomena
and processes. The brightest X-ray sources are typically accretion-powered
objects: active galactic nuclei and low- or high-mass X-ray binaries. Such
objects with X-ray luminosities of > 10^{37} ergs/s can now b... | astro-ph |
Massive black holes at high redshifts from superconducting cosmic
strings: The observation of quasars at high redshifts presents a mystery in the theory
of black hole formation. In order to source such objects, one often relies on
the presence of heavy seeds ($M \approx 10^{4-6} \, M_{\odot}$) in place at
early times... | astro-ph |
Bridging the Gap Between Simply Parametrized and Free-Form Pixelated
Models of Galaxy Lenses: The Case of WFI 2033-4723 Quad: We study the radial and azimuthal mass distribution of the lensing galaxy in
WFI2033-4723. Mindful of the fact that modeling results depend on modeling
assumptions, we examine two very differe... | astro-ph |
Synchrotron radiation from the fast tail of dynamical ejecta of neutron
star mergers: We find, using high resolution numerical relativistic simulations, that the
tail of the dynamical ejecta of neutron star mergers extends to mildly
relativistic velocities faster than $0.7c$. The kinetic energy of this fast
tail is $... | astro-ph |
Kinematics of Black Hole X-ray Binary GRS 1915+105: The space velocity of a stellar black hole encodes the history of its
formation and evolution. Here we measure the 3-dimensional motion of the
microquasar GRS 1915+105, using a decade of astrometry with the NRAO Very Long
Baseline Array, together with the published ra... | astro-ph |
Inhomogeneous Big Bang Nucleosynthesis: Upper Limit on Omega_b and
Production of Lithium, Beryllium, and Boron: We examine the Big Bang nucleosynthesis (BBN) process in the presence of
small-scale baryon inhomogeneities. Primordial abundance yields for D, He4,
Li6, Li7, Be9, and B11 are computed for wide ranges of pa... | astro-ph |
BST1047+1156: A (Failing) Ultradiffuse Tidal Dwarf in the Leo I Group: We use deep Hubble Space Telescope imaging to study the resolved stellar
populations in BST1047+1156, a gas-rich, ultradiffuse dwarf galaxy found in the
intragroup environment of the Leo I galaxy group. While our imaging reaches
approximately two ma... | astro-ph |
Interstellar extinction in twenty open star clusters: The interstellar extinction law in twenty open star clusters namely Berkeley
7, Collinder 69, Hogg 10, NGC 2362, Czernik 43, NGC 6530, NGC 6871, Bochum 10,
Haffner 18, IC 4996, NGC 2384, NGC 6193, NGC 6618, NGC 7160, Collinder 232,
Haffner 19, NGC 2401, NGC 6231, NG... | astro-ph |
Dependence of the He/H8 emission ratio on brightness, temperature, and
structuring of prominences: We investigate the dependence of the He/H8 emission ratio on kinetic
temperature and total Balmer brightness. The line pair He\,{\sc i}\,3888\,\AA{}
and H$_8$\,3889 has been observed simultaneously with the Ca II 8498 l... | astro-ph |
Clustered Massive Star Formation in Molecular Clouds: I review some important questions in the field of massive star formation:
What are the initial conditions for proto star clusters and how do they arise?
What are the initial conditions for individual massive star formation within
star clusters? How do massive protos... | astro-ph |
Prompt emission of GRB 121217A from gamma-rays to the NIR: The mechanism that causes the prompt-emission episode of gamma-ray bursts
(GRBs) is still widely debated despite there being thousands of prompt
detections. The favoured internal shock model relates this emission to
synchrotron radiation. However, it does not a... | astro-ph |
Fast-varying time lags in the Quasi-periodic Oscillation in GRS 1915+105: The properties of sub-second time variability of the X-ray emission of the
black-hole binary GRS 1915+105 are very complex and strictly connected to its
patterns of variability observed on long time scales. A key aspect for
determining the geomet... | astro-ph |
On the origin of X-ray spectra in luminous blazars: Gamma-ray luminosities of some quasar-associated blazars imply jet powers
reaching values comparable to the accretion power even if assuming very strong
Doppler boosting and very high efficiency of gamma-ray production. With much
lower radiative efficiencies of proton... | astro-ph |
The Radiative Efficiency of Hot Accretion Flows: Two significant progresses have been made in the past years on our
understanding of hot accretion flows. One is that only a small fraction of
accretion flow available at the outer boundary can finally falls onto the black
hole while most of them is lost in outflow. Anoth... | astro-ph |
JWST high-z galaxy constraints on warm and cold dark matter models: We compare properties of high-redshift galaxies observed by JWST with
hydrodynamical simulations, in the standard cold dark matter model and in warm
dark matter models with a suppressed linear matter power spectrum. We find that
current data are not in... | astro-ph |
A Fourier method for the determination of focus for telescopes with
stars: We introduce a Fourier method (Fm) for the determination of best focus for
telescopes with stars. Our method fits a power function, that we will derive in
this paper, to a set of images taken as a function of focuser position. The
best focus p... | astro-ph |
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