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Bhjet: a public multi-zone, steady state jet + thermal corona spectral
model: Accreting black holes are sources of major interest in astronomy, particular
those launching jets because of their ability to accelerate particles, and
dramatically affect their surrounding environment up to very large distances.
The spatia... | astro-ph_HE |
The Long-term Monitoring Results of Insight-HXMT in the First 4 Yr
Galactic Plane Scanning Survey: The first X-ray source catalog of Insight-HXMT Galactic Plane (|b|<10deg)
Scanning Survey (GPSS) is presented based on the data accumulated from June
2017 to August 2021. The 4 yr limit sensitivities at main energy band... | astro-ph_HE |
Enhancing gravitational wave astronomy with galaxy catalogues: Joint gravitational wave (GW) and electromagnetic (EM) observations, as a key
research direction in multi-messenger astronomy, will provide deep insight into
the astrophysics of a vast range of astronomical phenomena. Uncertainties in
the source sky locatio... | astro-ph_HE |
Massive White Dwarfs in the Galactic Center: A Chandra X-ray
Spectroscopy of Cataclysmic Variables: Previous X-ray observations toward the Nuclear Star Cluster (NSC) at the
Galactic center have discovered thousands of point sources, most of which were
believed to be cataclysmic variables (CVs), i.e., a white dwarf (W... | astro-ph_HE |
Nitrogen K-shell photoabsorption: Reliable atomic data have been computed for the spectral modeling of the
nitrogen K lines, which may lead to useful astrophysical diagnostics. Data sets
comprise valence and K-vacancy level energies, wavelengths, Einstein
$A$-coefficients, radiative and Auger widths and K-edge photoion... | astro-ph_HE |
Exploring binary-neutron-star-merger scenario of short-gamma-ray bursts
by gravitational-wave observation: We elucidate the feature of gravitational waves (GWs) from binary neutron
star merger collapsing to a black hole by general relativistic simulation. We
show that GW spectrum imprints the coalescence dynamics, fo... | astro-ph_HE |
Outflow-Driven Transients from the Birth of Binary Black Holes I:
Tidally-Locked Secondary Supernovae: We propose a new type of electromagnetic transients associated with the birth
of binary black holes (BBHs), which may lead to merger events accompanied by
gravitational waves in $\sim0.1-1$ Gyr. We consider the newb... | astro-ph_HE |
A NICER view of PSR J0030+0451: evidence for a global-scale multipolar
magnetic field: Recent modeling of NICER observations of thermal X-ray pulsations from the
surface of the isolated millisecond pulsar PSR J0030+0451 suggests that the hot
emitting regions on the pulsar's surface are far from antipodal, which is at... | astro-ph_HE |
Optical Spectroscopy of Bright Fermi LAT Blazars: We report on HET and Palomar 5 m spectroscopy of recently identified
$\gamma$-ray blazars in the {\it Fermi} LAT Bright Source List. These data
provide identifications for 10 newly discovered $\gamma$-ray flat spectrum
radio quasars (FSRQ) and six new BL Lacs plus impro... | astro-ph_HE |
A multi-wavelength study of the gamma-ray binary candidate HESS
J1832-093: We investigate the nature of the unidentified very-high-energy (VHE)
gamma-ray object, HESS J1832-093, in a multi-wavelength context. Based on X-ray
variability and spectral index ($\Gamma_X\sim\,1.5$), and its broad-band
spectrum (which was r... | astro-ph_HE |
Diverse Properties of Interstellar Medium Embedding Gamma-Ray Bursts at
the Epoch of Reionization: Analysis is performed on ultra-high resolution large-scale cosmological
radiation-hydrodynamic simulations to, for the first time, quantify the
physical environment of long-duration gamma-ray bursts (GRBs) at the epoch ... | astro-ph_HE |
Multi-wavelength observations of Isolated Neutron Stars: Almost 30 Isolated Neutron Stars (INSs) of different flavours have been
identified at optical, ultraviolet, or infrared (UVOIR) wavelengths. Here, I
present a short review of the historical background and describe the scientific
impact of INS observations in the ... | astro-ph_HE |
Hot disk of the Swift J0243.6+6124 revealed by Insight-HXMT: We report on analysis of observations of the bright transient X-ray pulsar
\src obtained during its 2017-2018 giant outburst with Insight-HXMT,
\emph{NuSTAR}, and \textit{Swift} observatories. We focus on the discovery of a
sharp state transition of the timin... | astro-ph_HE |
QCD, Gravitational Waves, and Pulsars: Investigations of the phase diagram of quantum chromodynamics (QCD) have
revealed that exotic new phases, the so called {\it color superconducting
phases}, may arise at very high baryon densities. It is speculated that these
exotic phases may arise in the cores of neutron stars. F... | astro-ph_HE |
Californium-254 and kilonova light curves: Neutron star mergers offer unique conditions for the creation of the heavy
elements and additionally provide a testbed for our understanding of this
synthesis known as the $r$-process. We have performed dynamical nucleosynthesis
calculations and identified a single isotope, $^... | astro-ph_HE |
On the approximation of the black hole shadow with a simple polar curve: A black hole embedded within a bright, optically thin emitting region
imprints a nearly circular "shadow" on its image, corresponding to the
observer's line-of-sight into the black hole. The shadow boundary depends on
the black hole's mass and spi... | astro-ph_HE |
The Euclidean distribution of Fast Radio Bursts: We investigate whether current data on the distribution of observed flux
densities of Fast Radio Bursts (FRBs) are consistent with a constant source
density in Euclidean space. We use the number of FRBs detected in two surveys
with different characteristics along with th... | astro-ph_HE |
Suzaku investigation into the nature of the nearest ultraluminous X-ray
source, M33 X-8: The X-ray spectrum of the nearest ultraluminous X-ray source, M33 X-8,
obtained by Suzaku during 2010 January 11 -- 13, was closely analyzed to
examine its nature. It is, by far, the only data with the highest signal
statistic in... | astro-ph_HE |
Fast TeV variability from misaligned minijets in the jet of M87: The jet of the radio galaxy M87 is misaligned, resulting in a Doppler factor
delta~1 for emission of plasma moving parallel to the jet. This makes the
observed fast TeV flares on timescales of t_v~5R_g/c harder to understand as
emission from the jet. In p... | astro-ph_HE |
Favorable conditions for heavy element nucleosynthesis in rotating
proto-magnetar winds: The neutrino-driven wind cooling phase of proto-neutron stars (PNSs) follows
successful supernovae. Wind models without magnetic fields or rotation fail to
achieve the necessary conditions for production of the third $r$-process ... | astro-ph_HE |
Magnetic Fields, Relativistic Particles, and Shock Waves in Cluster
Outskirts: It is only now, with low-frequency radio telescopes, long exposures with
high-resolution X-ray satellites and gamma-ray telescopes, that we are
beginning to learn about the physics in the periphery of galaxy clusters. In
the coming years, ... | astro-ph_HE |
Intra-Day Variability Observations of Two Dozens of Blazars at 4.8 GHz: Two dozens of radio loud active galactic nuclei (AGNs) have been observed
with Urumqi 25 m radio telescope in order to search for intra-day variability
(IDV). The target sources are blazars (namely flat spectrum radio quasars and
BL Lac objects) wh... | astro-ph_HE |
Did a Kilonova Set Off in Our Galactic Backyard 3.5 Myr ago?: The recent detection of the live isotopes $^{60}{\rm Fe}$ and $^{244}{\rm
Pu}$ in deep ocean sediments dating back to the past 3-4 Myr poses a serious
challenge to the identification of their production site(s). While $^{60}{\rm
Fe}$ is usually attributed to... | astro-ph_HE |
The Discovery of the Most Accelerated Binary Pulsar: Pulsars in relativistic binary systems have emerged as fantastic natural
laboratories for testing theories of gravity, the most prominent example being
the double pulsar, PSR J0737$-$3039. The HTRU-South Low Latitude pulsar survey
represents one of the most sensitive... | astro-ph_HE |
NuSTAR Observations of the Compton-thick Active Galactic Nucleus and
Ultraluminous X-ray Source Candidate in NGC 5643: We present two NuSTAR observations of the local Seyfert 2 active galactic
nucleus (AGN) and an ultraluminous X-ray source (ULX) candidate in NGC 5643.
Together with archival data from Chandra, XMM-Ne... | astro-ph_HE |
Absorption of GRB X-ray Afterglows by The Missing Baryons: Confronting
Observations with Cosmological Simulations: A large fraction of the baryons at low redshift are undetected, and likely
reside in the tenuous, hot intergalactic medium (IGM). One way to probe the
missing baryons is through their absorption of brigh... | astro-ph_HE |
Instability of twisted magnetar magnetospheres: We present three-dimensional force-free electrodynamics simulations of
magnetar magnetospheres that demonstrate the instability of certain degenerate,
high energy equilibrium solutions of the Grad-Shafranov equation. This result
indicates the existence of an unstable bran... | astro-ph_HE |
The link between short Gamma-ray bursts and Gravitational Waves:
perspectives for the THESEUS mission: The knowledge of the class of short Gamma-Ray Bursts (GRBs), characterised by
a duration of the gamma-ray emission $\leq 2$ s, experienced an impressive
boost in the last decade. In particular, the discovery of shor... | astro-ph_HE |
Time of Flight and Supernova Progenitor Effects on the Neutrino Halo: We argue that the neutrino halo, a population of neutrinos that have
undergone direction-changing scattering in the stellar envelope of a
core-collapse supernova (CCSNe), is sensitive to neutrino emission history
through time of flight. We show that ... | astro-ph_HE |
X-ray counterpart of gravitational waves due to binary neutron star
mergers: light curves, luminosity functions, and event rate densities: Zhang (2013) proposed a type of GRB-less X-ray transient associated with
double neutron star (NS-NS) mergers under the conjecture of a rapidly-spinning
magnetar merger product wit... | astro-ph_HE |
Long-term monitoring of LS I+61303 with INTEGRAL: LS I+61303 is one of the few high-mass X-ray binaries that have been recently
observed at TeV and GeV energies. Here we investigate the hard X-ray spectral
and timing properties of this source using the IBIS/ISGRI instrument on-board
the INTEGRAL satellite. We carry out... | astro-ph_HE |
The role of metallicity in high mass X-ray binaries in galaxy formation
models: Recent theoretical works claim that high-mass X-ray binaries (HMXBs) could
have been important sources of energy feedback into the interstellar and
intergalactic media, playing a major role in the reionization epoch. A
metallicity depende... | astro-ph_HE |
Multiwavelength behaviour of the blazar 3C279: decade-long study from
$γ$-ray to radio: We report the results of decade-long (2008-2018) $\gamma$-ray to 1 GHz radio
monitoring of the blazar 3C 279, including GASP/WEBT, $\it{Fermi}$ and
$\it{Swift}$ data, as well as polarimetric and spectroscopic data. The X-ray
and $... | astro-ph_HE |
Type Ic Supernova of a 22 $\text{M}_{\odot}$ Progenitor: Type Ic supernovae (SNe Ic) are a sub-class of core-collapse supernovae that
exhibit no helium or hydrogen lines in their spectra. Their progenitors are
thought to be bare carbon-oxygen cores formed during the evolution of massive
stars that are stripped of their... | astro-ph_HE |
ASAS-SN search for optical counterparts of gravitational-wave events
from the third observing run of Advanced LIGO/Virgo: We report on the search for electromagnetic counterparts to the nine
gravitational-wave events with a $>$60\% probability of containing a neutron
star during the third (O3) LIGO-Virgo Collaboratio... | astro-ph_HE |
Star formation, supernovae, iron, and alpha: consistent cosmic and
Galactic histories: Recent versions of the observed cosmic star-formation history (SFH) have
resolved an inconsistency with the stellar mass density history. We show that
the revised SFH also scales up the delay-time distribution (DTD) of Type Ia
supe... | astro-ph_HE |
Dissipation of the striped pulsar wind: Rapidly rotating neutron stars blow a relativistic, magnetized wind mainly
composed of electron-positron pairs. The free expansion of the wind terminates
far from the neutron star where a weakly magnetized pulsar wind nebula forms,
implying efficient magnetic dissipation somewher... | astro-ph_HE |
Acceleration and propagation of ultra high energy cosmic rays: We review the physics of the highest energy cosmic rays. The discovery of
their sources, still unknown, will reveal the most energetic astrophysical
objects in the universe and could unveil new physics beyond the standard model
of particle physics. We discu... | astro-ph_HE |
CLUES on Fermi-LAT prospects for the extragalactic detection of munuSSM
gravitino Dark Matter: The munuSSM is a supersymmetric model that has been proposed to solve the
problems generated by other supersymmetric extensions of the standard model of
particle physics. Given that R-parity is broken in the munuSSM, the gr... | astro-ph_HE |
LeHaMoC: a versatile time-dependent lepto-hadronic modeling code for
high-energy astrophysical sources: Recent associations of high-energy neutrinos with active galactic nuclei
(AGN) have revived the interest in leptohadronic models of radiation from
astrophysical sources. The rapid increase in the amount of acquired... | astro-ph_HE |
AT2017gfo: an anisotropic and three-component kilonova counterpart of
GW170817: The detection of a kilo/macronova electromagnetic counterpart (AT2017gfo) of
the first gravitational wave signal compatible with the merger of two neutron
stars (GW170817) has confirmed the occurrence of r-process nucleosynthesis in
this ... | astro-ph_HE |
Bondi on spherically symmetric accretion: Hermann Bondi's 1952 paper "On spherically symmetrical accretion" is
recognized as one of the foundations of accretion theory. Although Bondi later
remarked that it was "not much more than an examination exercise", his
mathematical analysis of spherical accretion on to a point ... | astro-ph_HE |
Indications of non-conservative mass-transfer in AMXPs: Context. Since the discovery of the first Accreting Millisecond X-ray Pulsar
SAX J1808.4-3658 in 1998, the family of these sources kept growing on.
Currently, it counts 22 members. All AMXPs are transients with usually very
long quiescence periods, implying that m... | astro-ph_HE |
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_HE |
Possible hard X-ray shortages in bursts from KS 1731-260 and 4U 1705-44: Aims: A hard X-ray shortage, implying the cooling of the corona, was observed
during bursts of IGR J17473-272, 4U 1636-536, Aql X-1, and GS 1826-238. Apart
from these four sources, we investigate here an atoll sample, in which the
number of bursts... | astro-ph_HE |
The Role of Fission in Neutron Star Mergers and its Impact on the
r-Process Peaks: Comparing observational abundance features with nucleosynthesis predictions
of stellar evolution or explosion simulations can scrutinize two aspects: (a)
the conditions in the astrophysical production site and (b) the quality of the
nu... | astro-ph_HE |
Supergiant, fast, but not so transient 4U 1907+09: We have investigated the dipping activity observed in the high-mass X-ray
binary 4U 1907+09 and shown that the source continues to pulsate in the "off"
state, noting that the transition between the "on" and "off" states may be
either dip-like or flare-like. This behavi... | astro-ph_HE |
The Fermi Haze: A Gamma-Ray Counterpart to the Microwave Haze: The Fermi Gamma-Ray Space Telescope reveals a diffuse inverse Compton signal
in the inner Galaxy with a similar spatial morphology to the microwave haze
observed by WMAP, supporting the synchrotron interpretation of the microwave
signal. Using spatial templ... | astro-ph_HE |
A Systematic Search for Periodically Varying Quasars in Pan-STARRS1: An
Extended Baseline Test in Medium Deep Survey Field MD09: We present a systematic search for periodically varying quasars and
supermassive black hole binary (SMBHB) candidates in the Pan-STARRS1 (PS1)
Medium Deep Survey's MD09 field. From a color-... | astro-ph_HE |
Identification of AGN in the XMM-Newton X-ray survey of the SMC: Context: Finding Active Galactic Nuclei (AGN) behind the Magellanic Clouds
(MCs) is difficult because of the high stellar density in these fields.
Although the first AGN behind the Small Magellanic Cloud (SMC) were reported in
the 1980s, it is only recent... | astro-ph_HE |
A dispersion excess from pulsar wind nebulae and supernova remnants:
Implications for pulsars and FRBs: Young pulsars and the pulsar wind nebulae (PWNe) or supernova remnants (SNRs)
that surround them are some of the most dynamic and high-powered environments
in our Universe. With the rise of more sensitive observati... | astro-ph_HE |
Returning radiation in strong gravity around black holes: Reverberation
from the accretion disc: We study reflected X-ray emission that returns to the accretion disc in the
strong gravitational fields around black holes using General Relativistic ray
tracing and radiative transfer calculations. Reflected X-rays that ... | astro-ph_HE |
Multiwavelength flaring activity of PKS1510-089: Aims: In this work, we analyse the multiwavelength brightness variations and
flaring activity of FSRQ PKS1510-089, aiming to constrain the position of the
emission sources.
Methods: We report 7 mm (43 GHz) radio and R-band polarimetric observations
of PKS1510-089. The ... | astro-ph_HE |
Equation-of-State Constraints on the Neutron-Star Binding Energy and
Tests of Binary Formation Scenarios: The second supernova that forms double-neutron-star systems is expected to
occur in a progenitor that is ultra-stripped due to binary interactions. Thus,
the secondary neutron star's mass as well as the post-supe... | astro-ph_HE |
Evidence of a non-conservative mass transfer in the ultra-compact X-ray
source XB 1916-053: The dipping source XB 1916-053 is a compact binary system with an orbital
period of 50 min harboring a neutron star. Using ten new {\it Chandra}
observations and one {\it Swift/XRT} observation, we are able to extend the
basel... | astro-ph_HE |
The Variable Pulsar Wind Nebula of PSR J1809-1917: PSR J1809-1917 is a young ($\tau=51$ kyr) energetic
($\dot{E}=1.8\times10^{36}$ erg s$^{-1}$) radio pulsar powering a pulsar wind
nebula (PWN). We report on the results of three Chandra X-ray Observatory
observations which show that the PWN consists of a small ($\sim 2... | astro-ph_HE |
Magnetosphere of an orbiting neutron star: We conduct force-free simulations of a single neutron star undergoing orbital
motion in flat spacetime, mimicking the trajectory of the star about the center
of mass on a compact binary system. Our attention is focused on the kinetic
energy being extracted from the orbit by th... | astro-ph_HE |
The Redshift Dependence of the Radio Flux of Gamma-Ray Bursts and Their
Host Galaxies: Using multiwavelength observations of radio afterglows, we confirm the
hypothesis that the flux density of gamma-ray bursts (GRBs) at a fixed
observing frequency is invariable when the distance of the GRBs increases,
which means th... | astro-ph_HE |
Searching for TeV Dark Matter in Irregular dwarf galaxies with HAWC
Observatory: We present the results of dark matter (DM) searches in a sample of 31 dwarf
irregular (dIrr) galaxies within the field of view of the HAWC Observatory.
dIrr galaxies are DM dominated objects, which astrophysical gamma-ray emission
is est... | astro-ph_HE |
From Observations near the Earth to the Local Interstellar Spectra: Propagation of cosmic rays (CRs) from their sources to the observer is
described mainly as plain diffusion at high energies, while at lower energies
there are other physical processes involved, both in the interstellar space and
in the heliosphere. The... | astro-ph_HE |
The potential role of binary neutron star merger afterglows in
multimessenger cosmology: Binary neutron star mergers offer a new and independent means of measuring
the Hubble constant $H_0$ by combining the gravitational-wave inferred source
luminosity distance with its redshift obtained from electromagnetic follow-u... | astro-ph_HE |
A Wolf-Rayet-like progenitor of supernova SN 2013cu from spectral
observations of a wind: The explosive fate of massive stripped Wolf-Rayet (W-R) stars is a key open
question in stellar physics. An appealing option is that hydrogen-deficient W-R
stars are the progenitors of some H-poor supernova (SN) explosions of Ty... | astro-ph_HE |
Peculiarly Narrow SED of GRB 090926B with MAXI and Fermi/GBM: The monitor of all-sky X-ray image (MAXI) Gas Slit Camera (GSC) on the
International Space Station (ISS) detected a gamma-ray burst (GRB) on 2009,
September 26, GRB\,090926B. This GRB had extremely hard spectra in the X-ray
energy range. Joint spectral fitti... | astro-ph_HE |
Radio Analysis of SN 2004C Reveals an Unusual CSM Density Profile as a
Harbinger of Core Collapse: We present extensive multi-frequency VLA and VLBA observations of the
radio-bright supernova (SN) IIb SN 2004C that span $\sim(40-2793)$ days
post-explosion. We interpret the temporal evolution of the radio spectral
ene... | astro-ph_HE |
Consequences of a Dark Disk for the Fermi and PAMELA Signals in Theories
with a Sommerfeld Enhancement: Much attention has been given to dark matter explanations of the PAMELA
positron fraction and Fermi electronic excesses. For those theories with a
TeV-scale WIMP annihilating through a light force-carrier, the asso... | astro-ph_HE |
Chandra Phase-Resolved Spectroscopy of the High Magnetic Field Pulsar
B1509-58: We report on a timing and spectral analysis of the young, high magnetic field
rotation-powered pulsar (RPP) B1509-58 using Chandra continuous-clocking mode
observation. The pulsar's X-ray light curve can be fit by the two Gaussian
compone... | astro-ph_HE |
Evolution of the radio - X-ray coupling throughout an entire outburst of
Aquila X-1: The 2009 November outburst of the neutron star X-ray binary Aquila X-1 was
observed with unprecedented radio coverage and simultaneous pointed X-ray
observations, tracing the radio emission around the full X-ray hysteresis loop
of th... | astro-ph_HE |
X-ray Pulsations from the region of the Supergiant Fast X-ray Transient
IGR J17544-2619: Phase-targeted RXTE observations have allowed us to detect a transient 71.49
\pm 0.02 s signal that is most likely to be originating from the supergiant
fast X-ray transient IGR J17544-2619. The phase-folded light curve shows a
p... | astro-ph_HE |
StrayCats: A catalog of NuSTAR Stray Light Observations: We present StrayCats: a catalog of NuSTAR stray light observations of X-ray
sources. Stray light observations arise for sources 1--4$^{\circ}$ away from
the telescope pointing direction. At this off-axis angle, X-rays pass through a
gap between optics and apertur... | astro-ph_HE |
Spectral and polarization properties of black hole accretion disc
emission: including absorption effects: The study of radiation emitted from black hole accretion discs represents a
crucial way to understand the main physical properties of these sources, and in
particular the black hole spin. Beside spectral analysis... | astro-ph_HE |
Modelling Continuum Reverberation in AGN: A Spectral-Timing Analysis of
the UV Variability Through X-ray Reverberation in Fairall 9: Continuum reverberation mapping of AGN can provide new insight into the
nature and geometry of the accretion flow. Some of the X-rays from the central
corona irradiating the disc are ab... | astro-ph_HE |
The chemical enrichment of long-GRB nurseries up to z=2: We investigate the existence of a metallicity threshold for the production of
long gamma-ray bursts (LGRBs). We used the host galaxies of the Swift/BAT6
sample of LGRBs. We considered the stellar mass, star formation rate (SFR), and
metallicity determined from th... | astro-ph_HE |
Fermi Observation of the transitional pulsar binary XSS J12270-4859: Because of the disappearance of its accretion disk since the time period
around 2012 November--December, XSS J12270-4859 has recently been identified
as, in addition to PSR J1023+0038, another transitional millisecond pulsar
binary. We have carried ou... | astro-ph_HE |
Cosmic ray Transport in Magnetohydrodynamic turbulence: This paper studies cosmic ray (CR) transport in magneto hydrodynamic (MHD)
turbulence. CR transport is strongly dependent on the properties of the
magnetic turbulence. We perform test particle simulations to study the
interactions of CR with both total MHD turbule... | astro-ph_HE |
Radio quasars and the link with GAIA: Modeling VLBI ejections of nuclei of extragalactic radio sources, indicates
that their nuclei contain a binary black hole system. One can derive the
distance and the positions of the two black holes in the plane of the sky. We
can also use the RMS of the time series of the ICRF2 su... | astro-ph_HE |
Observations of the Very Young Type Ia Supernova 2019np with
Early-excess Emission: Early-time radiative signals from type Ia supernovae (SNe Ia) can provide
important constraints on the explosion mechanism and the progenitor system. We
present observations and analysis of SN 2019np, a nearby SN Ia discovered
within ... | astro-ph_HE |
Mass composition of ultra-high-energy cosmic rays with the Telescope
Array Surface Detector Data: The results on ultra-high-energy cosmic rays (UHECR) mass composition
obtained with the Telescope Array surface detector are presented. The analysis
employs the boosted decision tree (BDT) multivariate analysis built upo... | astro-ph_HE |
A Model for Pair Production Limit Cycles in Pulsar Magnetospheres: It was recently proposed that the electric field oscillation as a result of
self-consistent $e^{\pm}$ pair production may be the source of coherent radio
emission from pulsars. Direct Particle-in-Cell (PIC) simulations of this
process have shown that th... | astro-ph_HE |
Magnetar Activity via the Density-Shear Instability in Hall-MHD: We investigate the density-shear instability in Hall-MHD via numerical
simulation of the full non-linear problem, in the context of magnetar activity.
We confirm the development of the instability of a plane-parallel magnetic
field with an appropriate int... | astro-ph_HE |
An Ultra-Fast X-ray Disk Wind in the Neutron Star Binary GX 340+0: We present a spectral analysis of a brief Chandra/HETG observation of the
neutron star low-mass X-ray binary GX~340+0. The high-resolution spectrum
reveals evidence of ionized absorption in the Fe K band. The strongest feature,
an absorption line at app... | astro-ph_HE |
The blazar TXS 0506+056 associated with a high-energy neutrino: insights
into extragalactic jets and cosmic ray acceleration: A neutrino with energy of $\sim$290 TeV, IceCube-170922A, was detected in
coincidence with the BL Lac object TXS~0506+056 during enhanced gamma-ray
activity, with chance coincidence being reje... | astro-ph_HE |
Theoretical Delay Time Distributions: We briefly discuss the method of population synthesis to calculate
theoretical delay time distributions of type Ia supernova progenitors. We also
compare the results of the different research groups and conclude that although
one of the main differences in the results for single de... | astro-ph_HE |
Mass Ratios of Merging Double Neutron Stars as Implied by the Milky Way
Population: Of the seven known double neutron stars (DNS) with precisely measure masses
in the Milky Way that will merge within a Hubble time, all but one has a mass
ratio, $q$, close to unity. Recently, precise measurements of three
post-Kepleri... | astro-ph_HE |
Obscured $pp$-channel neutrino sources: We explore the possibility that the astrophysical neutrinos are produced in
$pp$-interactions with a gas cloud near the source acting as a beam dump, which
is sufficiently dense to significantly attenuate the associated gamma-ray flux
through pair-production on this gas. In this ... | astro-ph_HE |
Wide band observations of the X-ray burster GS 1826-238: GS 1826-238 is a well-studied X-ray bursting neutron star in a low mass
binary system. Thermal Comptonisation by a hot electron cloud is a widely
accepted mechanism accounting for its high energy emission, while the nature of
most of its soft X-ray output is not ... | astro-ph_HE |
High Energy Neutrinos from the Gravitational Wave event GW150914
possibly associated with a short Gamma-Ray Burst: High-energy neutrino (HEN) and gravitational wave (GW) can probe
astrophysical sources in addition to electromagnetic observations.
Multimessenger studies can reveal nature of the sources which may not b... | astro-ph_HE |
Simulations of Magnetic Fields in Tidally-Disrupted Stars: We perform the first magnetohydrodynamical simulations of tidal disruptions
of stars by supermassive black holes. We consider stars with both tangled and
ordered magnetic fields, for both grazing and deeply disruptive encounters.
When the star survives disrupti... | astro-ph_HE |
Spectro-Timing Analysis of a highly variable narrow-line Seyfert 1
galaxy NGC 4748 with AstroSat and XMM-Newton: We present a detailed timing and spectral study of an extremely variable
narrow-line Seyfert~1 galaxy NGC 4748 using observations in the year 2017 and
2014 performed with AstroSat and XMM-Newton, respectiv... | astro-ph_HE |
The Konus-Wind catalog of gamma-ray bursts with known redshifts. II.
Waiting mode bursts simultaneously detected by Swift/BAT: In the Second part of The Konus-Wind Catalog of Gamma-Ray Bursts with Known
Redshifts (first part: Tsvetkova et al. 2017; T17), we present the results of a
systematic study of gamma-ray burst... | astro-ph_HE |
Massive non-thermal radio emitters: new data and their modelling: During recent years some non-thermal radio emitting OB stars have been
discovered to be binary, or multiple systems. The non-thermal emission is due
to synchrotron radiation that is emitted by electrons accelerated up to high
energies. The electron accel... | astro-ph_HE |
Puffy accretion disks: sub-Eddington, optically thick, and stable: We report on a new class of solutions of black hole accretion disks that we
have found through three-dimensional, global, radiative magnetohydrodynamic
simulations in general relativity.
It combines features of the canonical thin, slim and thick disk ... | astro-ph_HE |
Cosmic ray Transport in Magnetohydrodynamic turbulence: This paper studies cosmic ray (CR) transport in magneto hydrodynamic (MHD)
turbulence. CR transport is strongly dependent on the properties of the
magnetic turbulence. We perform test particle simulations to study the
interactions of CR with both total MHD turbule... | astro-ph_HE |
The Spin of New Black Hole Candidate: MAXI J1803-298 Observed by NuSTAR
and NICER: MAXI J1803-298, a newly-discovered Galactic transient and black hole
candidate, was first detected by \emph{MAXI}/GSC on May 1st, 2021. In this
paper, we present a detailed spectral analysis of MAXI J1803-298. Utilizing the
X-ray refle... | astro-ph_HE |
Discovery of a recurrent spectral evolutionary cycle in the
ultra-luminous X-ray sources Holmberg II X-1 and NGC 5204 X-1: Most ultra-luminous X-ray sources (ULXs) are now thought to be powered by
stellar-mass compact objects accreting at super-Eddington rates. While the
discovery of evolutionary cycles have marked a... | astro-ph_HE |
Accretion Properties and Estimation of Spin of Galactic Black Hole
Candidate Swift J1728.9-3613 with NuSTAR during its 2019 outburst: Black hole X-ray binaries (BHXRBs) play a crucial role in understanding the
accretion of matter onto a black hole. Here, we focus on exploring the
transient BHXRB \source~discovered by... | astro-ph_HE |
Dark Matter Density Spikes around Primordial Black Holes: We show that density spikes begin to form from dark matter particles around
primordial black holes immediately after their formation at the
radiation-dominated cosmological stage. This follows from the fact that in the
thermal velocity distribution of particles ... | astro-ph_HE |
Early optical emission in support of synchrotron radiation in
$γ$-ray bursts: The origin of prompt emission in $\gamma$-ray bursts (GRBs) is highly debated
topic. The observed spectra are supposed to play a crucial role in constraining
the location of the emitting region, the strength of the magnetic field and the
di... | astro-ph_HE |
A NICER Discovery of a Low-Frequency Quasi-Periodic Oscillation in the
Soft-Intermediate State of MAXI J1535-571: We present the discovery of a low-frequency $\approx 5.7$ Hz quasi-periodic
oscillation (QPO) feature in observations of the black hole X-ray binary MAXI
J1535-571 in its soft-intermediate state, obtained... | astro-ph_HE |
Spectral evolution responsible for the transition from positive lags to
negative lags in Gamma-ray Bursts: It was well known that most of gamma-ray bursts (GRBs) are dominated by
positive spectral lags, while a small fraction of GRBs show negative lags.
However, Wei et al. firstly identified a well-defined transition... | astro-ph_HE |
Gravitational-wave Signals From Three-dimensional Supernova Simulations
With Different Neutrino-Transport Methods: We compare gravitational-wave (GW) signals from eight three-dimensional
simulations of core-collapse supernovae, using two different progenitors with
zero-age main sequence masses of 9 and 20 solar masse... | astro-ph_HE |
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