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Deep Synoptic Array science I: discovery of the host galaxy of FRB
20220912A: We report the detection and interferometric localization of the repeating
fast radio burst (FRB) source FRB 20220912A during commissioning observations
with the Deep Synoptic Array (DSA-110). Two bursts were detected from FRB
20220912A, one... | astro-ph_HE |
The XMM-Newton Slew view of IGRJ17361-4441: a transient in the globular
cluster NGC 6388: IGRJ17361-4441 is a hard transient recently observed by the INTEGRAL
satellite. The source, close to the center of gravity of the globular cluster
NGC 6388, quickly became the target of follow-up observations conducted by the
Ch... | astro-ph_HE |
Radio Monitoring of the Tidal Disruption Event Swift J164449.3+573451.
IV. Continued Fading and Non-Relativistic Expansion: We present continued radio and X-ray observations of the previously
relativistic tidal disruption event (TDE) Swift J164449.3+573451 (\sw)
extending to about 9.4 years post disruption, as part o... | astro-ph_HE |
How unique are pulsar wind nebulae models? Implementation of a
multi-parameter, automatic fitting for time-dependent spectra: Due to the computational cost of calculating a great number of variations of
the parameters, detailed radiative models of pulsar wind nebulae (PWNe) do not
usually contain fitting algorithms. ... | astro-ph_HE |
Cosmic Neutron Star Merger Rate and Gravitational Waves constrained by
the R Process Nucleosynthesis: The cosmic evolution of the neutron star merger (NSM) rate can be deduced
from the observed cosmic star formation rate. This allows to estimate the rate
expected in the horizon of the gravitational wave detectors adv... | astro-ph_HE |
NICER observations of the Crab pulsar glitch of 2017 November: Context: The Crab pulsar underwent its largest timing glitch on 2017 Nov 8.
The event was discovered at radio wavelengths, and was followed at soft X-ray
energies by observatories, such as XPNAV and NICER. aims: This work aims to
compare the glitch behavior... | astro-ph_HE |
Study of measured pulsar masses and their possible conclusions: We study the statistics of 61 measured masses of neutron stars (NSs) in
binary pulsar systems, including 18 double NS (DNS) systems, 26 radio pulsars
(10 in our Galaxy) with white dwarf (WD) companions, 3 NSs with main-sequence
companions, 13 NSs in X-ray ... | astro-ph_HE |
Type IIP supernova SN 2016X in radio frequencies: Context: The study of radio emission from core-collapse supernovae (SNe)
probes the interaction of the ejecta with the circumstellar medium (CSM) and
reveals details of the mass-loss history of the progenitor. Aims: We report
observations of the type IIP supernova SN\,2... | astro-ph_HE |
Nuclei in Strongly Magnetised Neutron Star Crusts: We discuss the ground state properties of matter in outer and inner crusts of
neutron stars under the influence of strong magnetic fields. In particular, we
demonstrate the effects of Landau quantization of electrons on compositions of
neutron star crusts. First we rev... | astro-ph_HE |
New complex EAS installation of the Tien Shan Mountain Cosmic Ray
Station: We present a description of the new complex installation for the study of
extensive air showers which was created at the Tien Shan mountain cosmic ray
station, as well as the results of the test measurements made there in
2014-2016. At present... | astro-ph_HE |
Observational characteristics of accretion onto black holes: These notes resulted from a series of lectures at the IAC winter school. They
are designed to help students, especially those just starting in subject, to
get hold of the fundamental tools used to study accretion powered sources. As
such, the references give ... | astro-ph_HE |
Fermi LAT Observations of LS 5039: The first results from observations of the high mass X-ray binary LS 5039
using the Fermi Gamma-ray Space Telescope data between 2008 August and 2009
June are presented. Our results indicate variability that is consistent with
the binary period, with the emission being modulated with ... | astro-ph_HE |
Minutes-delayed jets from a neutron star companion in core collapse
supernovae: I study cases where a neutron star (NS; or a black hole) companion to a type
Ib or type Ic (stripped-envelope) core collapse supernova (CCSN) accretes mass
from the explosion ejecta and launches jets minutes to hours after explosion.
The ... | astro-ph_HE |
First discovery of new pulsars and RRATs with CHIME/FRB: We report the discovery of seven new Galactic pulsars with the Canadian
Hydrogen Intensity Mapping Experiment's Fast Radio Burst backend (CHIME/FRB).
These sources were first identified via single pulses in CHIME/FRB, then
followed up with CHIME/Pulsar. Four sour... | astro-ph_HE |
An improved infrastructure for the IceCube realtime system: The IceCube realtime alert system has been operating since 2016. It provides
prompt alerts on high-energy neutrino events to the astroparticle physics
community. The localization regions for the incoming direction of neutrinos are
published through NASA's Gamm... | astro-ph_HE |
Prospects for ultra-high-energy particle acceleration at relativistic
shocks: We study the acceleration of charged particles by ultra-relativistic shocks
using test-particle Monte-Carlo simulations. Two field configurations are
considered: (i) shocks with uniform upstream magnetic field in the plane of the
shock, and... | astro-ph_HE |
A search for gamma-ray prompt emission associated with the Lorimer Burst
FRB010724: No transient electromagnetic emission has yet been found in association to
fast radio bursts (FRBs), the only possible exception (3sigma confidence) being
the putative gamma-ray signal detected in Swift/BAT data in the energy band
15-... | astro-ph_HE |
Type IIn supernovae as sources of high energy neutrinos: It is shown that high-energy astrophysical neutrinos observed in the IceCube
experiment can be produced by protons accelerated in extragalactic Type IIn
supernova remnants by shocks propagating in the dense circumstellar medium. The
nonlinear diffusive shock acce... | astro-ph_HE |
Evidence for Unresolved Gamma-Ray Point Sources in the Inner Galaxy: We present a new method to characterize unresolved point sources (PSs),
generalizing traditional template fits to account for non-Poissonian photon
statistics. We apply this method to Fermi Large Area Telescope gamma-ray data
to characterize PS popula... | astro-ph_HE |
Can FSRQ 3C 345 be a Very High Energy Blazar Candidate?: The recent detection of very high energy (VHE) emissions from flat spectrum
radio quasars (FSRQs) at high redshifts has revealed that the universe is more
transparent to VHE $\gamma$-rays than it was expected. It has also questioned
the plausible VHE emission mec... | astro-ph_HE |
Jets at lowest mass accretion rates: We present results of recent observations and theoretical modeling of data
from black holes accreting at very low luminosities (L/L_Edd ~ 10^{-8}). We
discuss our newly developed time-dependent model for episodic ejection of
relativistic plasma within a jet framework, and a successf... | astro-ph_HE |
The Long-term Variability of the X-ray Sources in M82: We investigate the long-term variability exhibited by the X-ray point sources
in the starburst galaxy M82. By combining 9 Chandra observations taken between
1999 and 2007, we detect 58 X-ray point sources within the D25 isophote of M82
down to a luminosity of ~ 10^... | astro-ph_HE |
SMBH Seeds: Model Discrimination with High Energy Emission Based on
Scaling Relation Evolution: We explore the expected X-ray (0.5-2keV) signatures from super massive black
holes (SMBHs) at high redshifts ($z\sim5-12$) assuming various models for their
seeding mechanism and evolution. The seeding models are approxima... | astro-ph_HE |
The Role of Nucleon Strangeness in Supernova Explosions: Recent hydrodynamical simulations of supernova (SN) evolution have
highlighted the importance of a thorough control over microscopic physics
responsible for such internal processes as neutrino heating. In particular, it
has been suggested that modifications to th... | astro-ph_HE |
Orbital Modulation of Gamma Rays from PSR~J2339$-$0533: We report on orbital modulation of the 100-600 MeV gamma-ray emission of the
$P_{\rm B}=4.6$ hr millisecond pulsar binary PSR J2339$-$0533 using 11 yr of
Fermi Large Area Telescope data. The modulation has high significance (chance
probability $p\approx 10^{-7}$),... | astro-ph_HE |
Multi-Messenger Searches in Astrophysics: Multi-messenger astronomy has experienced an explosive development in the
past few years. While not being a particularly young field, it has recently
attracted a lot of attention by several major discoveries and unprecedented
observation campaigns covering the entity of the ele... | astro-ph_HE |
A Comparison of Gamma-ray Burst Subgroups Measured by RHESSI and BATSE: A sample of almost 400 Gamma-ray bursts (GRBs) detected by the RHESSI
satellite is studied statistically. We focus on GRB duration and hardness ratio
and use the statistical chi^2 test and the F-test to compare the number of GRB
subgroups in the RH... | astro-ph_HE |
Constraints from LIGO O3 data on gravitational-wave emission due to
r-modes in the glitching pulsar PSR J0537-6910: We present a search for continuous gravitational-wave emission due to r-modes
in the pulsar PSR J0537-6910 using data from the LIGO-Virgo Collaboration
observing run O3. PSR J0537-6910 is a young energe... | astro-ph_HE |
Radius-expansion burst spectra from 4U 1728-34: an ultracompact binary?: Recent theoretical and observational studies have shown that ashes from
thermonuclear burning may be ejected during radius-expansion bursts, giving
rise to photoionisation edges in the X-ray spectra. We report a search for such
features in Chandra... | astro-ph_HE |
X-ray bolometric corrections for Compton-thick active galactic nuclei: We present X-ray bolometric correction factors, $\kappa_{Bol}$ ($\equiv
L_{Bol}/L_X$), for Compton-thick (CT) active galactic nuclei (AGN) with the aim
of testing AGN torus models, probing orientation effects, and estimating the
bolometric output of... | astro-ph_HE |
A Fast-Evolving, Luminous Transient Discovered by K2/Kepler: For decades optical time-domain searches have been tuned to find ordinary
supernovae, which rise and fall in brightness over a period of weeks. Recently,
supernova searches have improved their cadences and a handful of fast-evolving
luminous transients (FELTs... | astro-ph_HE |
Pulse energy distribution for RRAT J0139+33 according to observations at
the frequency 111 MHz: Using five year monitoring observations, we did a blind search for pulses for
rotating radio transient (RRAT) J0139+33 and PSR B0320+39. At the interval \pm
1.5m of the time corresponding to the source passing through the ... | astro-ph_HE |
Forbidden Line Emission from Type Ia Supernova Remnants Containing
Balmer-Dominated Shells: Balmer-dominated shells in supernova remnants (SNRs) are produced by
collisionless shocks advancing into a partially neutral medium, and are most
frequently associated with Type Ia supernovae. We have analyzed Hubble Space
Tel... | astro-ph_HE |
Ultra-wide Bandwidth Observations of 19 pulsars with Parkes telescope: Flux densities are basic observation parameters to describe pulsars. In the
most updated pulsar catalog, 24% of the listed radio pulsars have no flux
density measurement at any frequency. Here, we report the first flux density
measurements, spectral... | astro-ph_HE |
Absorption effects in the blazar's gamma-ray spectra due to luminous
stars crossing the jet: Gamma-ray emission in active galaxies is likely produced within the inner
jet, or in the close vicinity of the supermassive black hole (SMBH) at
sub-parsec distances. Gamma rays have to pass through the surrounding massive
st... | astro-ph_HE |
Opacities of Singly and Doubly Ionised Neodymium and Uranium for
Kilonova Emission Modeling: Even though the electromagnetic counterpart AT2017gfo to the binary neutron
star merger GW170817 is powered by the radioactive decay of r-process nuclei,
only few tentative identifications of light r-process elements have bee... | astro-ph_HE |
The First Fermi LAT Gamma-Ray Burst Catalog: In three years of observations since the beginning of nominal science
operations in August 2008, the Large Area Telescope (LAT) on board the Fermi
Gamma Ray Space Telescope has observed high-energy (>20 MeV) \gamma-ray
emission from 35 gamma-ray bursts (GRBs). Among these, 2... | astro-ph_HE |
The variability timescales and brightness temperatures of radio flares
from stars to supermassive black holes: In this paper we compile the analysis of ~ 200 synchrotron flare events from
~ 90 distinct objects/events for which the distance is well established, and
hence the peak luminosity can be accurately estimated... | astro-ph_HE |
Suzaku and BeppoSAX X-ray Spectra of the Persistently Accreting
Neutron-Star Binary 4U 1705-44: We present an analysis of the broad-band spectra of 4U~1705--44 obtained with
{\it Suzaku} in 2006--2008 and by {\it BeppoSAX} in 2000. The source exhibits
two distinct states: the hard state shows emission from 1 to 150 k... | astro-ph_HE |
Bumpy Declining Light Curves Are Common in Hydrogen-poor Superluminous
Supernovae: Recent work has revealed that the light curves of hydrogen-poor (Type I)
superluminous supernovae (SLSNe), thought to be powered by magnetar central
engines, do not always follow the smooth decline predicted by a simple magnetar
spin-d... | astro-ph_HE |
Nonlinear variations in axisymmetric accretion: We subject the stationary solutions of inviscid and axially symmetric
rotational accretion to a time-dependent radial perturbation, which includes
nonlinearity to any arbitrary order. Regardless of the order of nonlinearity,
the equation of the perturbation bears a form t... | astro-ph_HE |
Classification of pulsars with Dirichlet process Gaussian mixture model: Young isolated neutron stars (INS) most commonly manifest themselves as
rotationally powered pulsars (RPPs) which involve conventional radio pulsars as
well as gamma-ray pulsars (GRPs) and rotating radio transients (RRATs). Some
other young INS fa... | astro-ph_HE |
Annihilation of positrons from AGN jets as a possible source of cosmic
gamma-ray background at energies below 511 keV: The origin of the diffuse gamma-ray background in the range from hundreds keV
to several MeV is not known conclusively. From current models and observations
it is believed that, at least partially, t... | astro-ph_HE |
Jet production in black-hole X-ray binaries and active galactic nuclei:
mass feeding and advection of magnetic fields: Relativistic jets are observed only in the low/hard and intermediate states
of X-ray binaries (XRBs), and are switched off in the thermal state, but they
appear to be present in both low-luminosity a... | astro-ph_HE |
Interaction between Molecular Clouds and MeV-TeV Cosmic-ray Protons
Escaped from Supernova Remnants: Recent discovery of the X-ray neutral iron line (Fe I K\alpha at 6.40 keV)
around several supernova remnants (SNRs) show that MeV cosmic-ray (CR) protons
are distributed around the SNRs and are interacting with neutra... | astro-ph_HE |
Spin-Down of the Long-Period Accreting Pulsar 4U 2206+54: 4U 2206+54 is a high mass X-ray binary which has been suspected to contain a
neutron star accreting from the wind of its companion BD +53 2790. Reig et al.
have recently detected 5560 s period pulsations in both RXTE and INTEGRAL
observations which they conclude... | astro-ph_HE |
Low-Latency Algorithm for Multi-messenger Astrophysics (LLAMA) with
Gravitational-Wave and High-Energy Neutrino Candidates: We describe in detail the online data analysis pipeline that was used in the
multi-messenger search for common sources of gravitational waves (GWs) and
high-energy neutrinos (HENs) during the se... | astro-ph_HE |
3D Relativistic MHD simulations of the gamma-ray binaries: In gamma-ray binaries neutron star is orbiting a companion that produces a
strong stellar wind. We demonstrate that observed properties of "stellar
wind"-"pulsar wind" interaction depend both on the overall wind thrust ratio,
as well as more subtle geometrical ... | astro-ph_HE |
An unusual transient following the short GRB 071227: We present X-ray and optical observations of the short duration gamma-ray
burst GRB 071227 and its host at $z=0.381$, obtained using \textit{Swift},
Gemini South and the Very Large Telescope. We identify a short-lived and
moderately bright optical transient, with flu... | astro-ph_HE |
Modelling interaction of relativistic and non-relativistic winds in
binary system PSR B1259-63/SS2883 - II. Impact of magnetization and
anisotropy of the pulsar wind: In this paper, we present a numerical study of the properties of the flow
produced by the collision of a magnetized anisotropic pulsar wind with its
... | astro-ph_HE |
Changes in the pulse phase dependence of X-ray emission lines in 4U
1626-67 with a torque reversal: We report results from an observation with the XMM-Newton observatory of a
unique X-ray pulsar 4U 1626-67. EPIC-pn data during the current spin-up phase
of 4U 1626-67 have been used to study pulse phase dependence of l... | astro-ph_HE |
Long-term periodicity in LSI+61303 as beat frequency between orbital and
precessional rate: Context: In the binary system LSI+61303 the peak flux density of the radio
outburst, which is related to the orbital period of 26.4960 +/- 0.0028d,
exibits a modulation of 1667 +/- 8 d. The radio emission at high spatial
resol... | astro-ph_HE |
A propeller scenario for the gamma-ray emission of low-mass X-ray
binaries: The case of XSS J12270-4859: XSS J12270-4859 is the only low mass X-ray binary (LMXB) with a proposed
persistent gamma-ray counterpart in the Fermi-LAT domain, 2FGL 1227.7-4853.
Here, we present the results of the analysis of recent INTEGRAL ... | astro-ph_HE |
The impact of resistive electric fields on particle acceleration in
reconnection layers: In the context of particle acceleration in high-energy astrophysical
environments featuring magnetic reconnection, the importance of the resistive
term of the electric field compared to the convective one is still under
debate. I... | astro-ph_HE |
Resonant energization of particles by radio AGN: A new mechanism of particle acceleration, based on the resonant interaction
of a classical electromagnetic wave (EM) with a quantum wave (associated with a
relativistic particle), is explored.
In a model illustrative calculation, we study the fate of a Klein Gordon wav... | astro-ph_HE |
Non-relativistic perpendicular shocks modeling young supernova remnants:
nonstationary dynamics and particle acceleration at forward and reverse
shocks: For parameters that are applicable to the conditions at young supernova
remnants, we present results of 2D3V particle-in-cell simulations of a
non-relativistic pla... | astro-ph_HE |
Subgrid modeling of neutrino oscillations in astrophysics: Approximating neutrino oscillations as subgrid physics is an appealing
prospect for simulators of core-collapse supernovae and neutron-star mergers.
Because flavor instabilities quickly lead to quasisteady states in oscillation
calculations, it is widely believ... | astro-ph_HE |
High resolution X-ray spectroscopy of Supergiant HMXB 4U1700$-$37 during
the compact object eclipse: We present an analysis of the first observation of the iconic High Mass X-ray
Binary \so with the \chandra High Energy Transmission Gratings during an X-ray
eclipse. The goal of the observation was to study the struct... | astro-ph_HE |
Probing the evolution of the EAS muon content in the atmosphere with
KASCADE-Grande: The evolution of the muon content of very high energy air showers (EAS) in
the atmosphere is investigated with data of the KASCADE-Grande observatory. For
this purpose, the muon attenuation length in the atmosphere is obtained to
$\L... | astro-ph_HE |
Proton acceleration in pulsar magnetospheres: Pulsars have been identified as good candidates for the acceleration of
cosmic rays, up to ultra-high energies. However, a precise description of the
acceleration processes at play is still to be established. Using 2D
particle-in-cell simulations, we study proton accelerati... | astro-ph_HE |
The population of X-ray supernova remnants in the Large Magellanic Cloud: We present a comprehensive X-ray study of the population of supernova
remnants (SNRs) in the LMC. Using primarily XMM-Newton, we conduct a systematic
spectral analysis of LMC SNRs to gain new insights on their evolution and the
interplay with the... | astro-ph_HE |
Detection of Millihertz Quasi-Periodic Oscillations in the X-Ray Binary
1RXS J180408.9$-$342058: Millihertz quasi-periodic oscillations (mHz QPOs) observed in neutron-star
low-mass X-ray binaries (NS LMXBs) are generally explained as marginally stable
thermonuclear burning on the neutron star surface. We report the d... | astro-ph_HE |
The magnetic field structure in CTA 102 from high resolution mm-VLBI
observations during the flaring state in 2016-2017: Investigating the magnetic field structure in the innermost regions of
relativistic jets is fundamental to shed light on the crucial physical
processes giving rise to the jet formation, as well as ... | astro-ph_HE |
TMRT observations of 26 pulsars at 8.6 GHz: Integrated pulse profiles at 8.6~GHz obtained with the Shanghai Tian Ma Radio
Telescope (TMRT) are presented for a sample of 26 pulsars. Mean flux densities
and pulse width parameters of these pulsars are estimated. For eleven pulsars
these are the first high-frequency observ... | astro-ph_HE |
X-ray emission from optical novae in M 31: The first supersoft source (SSS) identification with an optical nova in M 31
was based on ROSAT observations. Twenty additional X-ray counterparts (mostly
identified as SSS by their hardness ratios) were detected using archival ROSAT,
XMM-Newton and Chandra observations obtain... | astro-ph_HE |
Deep Hard X-ray Survey of the Large Magellanic Cloud: Results of the deep survey of the Large Magellanic Cloud (LMC), performed
with the INTEGRAL observatory, are presented. The long exposure (~7 Ms) allowed
us to detect twenty one sources in this sky region: ten belonging to the LMC
itself (7 HMXBs, 2 PSRs, 1 LMXB), s... | astro-ph_HE |
Properties of relativistic hot accretion flow around rotating black hole
with radially varying viscosity: We examine the effect of variable viscosity parameter ($\alpha$) in
relativistic, low angular momentum advective accretion flow around rotating
black holes. Following the recent simulation studies of magnetohydro... | astro-ph_HE |
Fermi-LAT observations of the LIGO/Virgo event GW170817: We present the Fermi Large Area Telescope (LAT) observations of the binary
neutron star merger event GW170817 and the associated short gamma-ray burst
(SGRB) GRB\,170817A detected by the Fermi Gamma-ray Burst Monitor. The LAT was
entering the South Atlantic Anoma... | astro-ph_HE |
Gamma-ray Emitting Narrow-Line Seyfert 1 Galaxies: Past, Present, and
Future: This article reviews our current understanding about $\gamma$-ray detected
narrow-line Seyfert 1 ($\gamma$-NLSy1) galaxies. The detection with the Large
Area Telescope onboard {\it Fermi}~Gamma-ray Space Telescope has provided the
strongest... | astro-ph_HE |
Gaia's Detectability of Black Hole-Main Sequence Star Binaries Formed in
Open Clusters: Black hole-main sequence star (BH-MS) binaries are one of the targets of the
future data releases of the astrometric satellite {\it Gaia}. They are supposed
to be formed in two main sites: a galactic field and star clusters. Howev... | astro-ph_HE |
Discovery of a ~5 day characteristic timescale in the Kepler power
spectrum of Zw 229-15: We present time series analyses of the full Kepler dataset of Zw 229-15. This
Kepler light curve --- with a baseline greater than three years, composed of
virtually continuous, evenly sampled 30-minute measurements --- is
unprec... | astro-ph_HE |
The population properties of spinning black holes using
Gravitational-wave Transient Catalog 3: Binary black holes formed via different pathways are predicted to have
distinct spin properties. Measuring these properties with gravitational waves
provides an opportunity to unveil the origins of binary black holes. Rece... | astro-ph_HE |
Taking a break: paused accretion in the symbiotic binary RT Cru: Symbiotic binaries sometimes hide their symbiotic nature for significant
periods of time. There is mounting observational evidence that in those
symbiotics that are powered solely by accretion of red-giant's wind material
onto a white dwarf, without any q... | astro-ph_HE |
A QPO in NGC 4945 from Archival RXTE Data: We report the discovery of a ~6-week quasi-periodic oscillation (QPO) in
archival NGC 4945 data observed by the Rossi X-ray Timing Explorer (RXTE)
satellite. QPOs are an important observable in accretion disks and have been
studied extensively in both neutron star (NS) and bla... | astro-ph_HE |
International X-ray Observatory (IXO) Assessment Study Report for the
ESA Cosmic Vision 2015-2025: The International X-Ray Observatory (IXO) will address fundamental questions
in astrophysics, including "When did the first SMBH form? How does large scale
structure evolve? What happens close to a black hole? What is t... | astro-ph_HE |
High-energy cosmic particles: A review of the status of the knowledge in the field of High-energy cosmic
particles is presented. The spectrum, arrival direction distribution and
composition measurements are summarized, together with some implications for
the understanding of the cosmic ray origin and their propagation.... | astro-ph_HE |
Impact of initial mass functions on the dynamical channel of
gravitational wave sources: Dynamically formed black hole (BH) binaries (BBHs) are important sources of
gravitational waves (GWs). Globular clusters (GCs) provide a major environment
to produce such BBHs, but the total mass of the known GCs is small compare... | astro-ph_HE |
The impact of Faraday effects on polarized black hole images of
Sagittarius A*: We study model images and polarization maps of Sagittarius A* at 230 GHz. We
post-process GRMHD simulations and perform a fully relativistic radiative
transfer calculation of the emitted synchrotron radiation to obtain polarized
images fo... | astro-ph_HE |
On radiative acceleration in spine-sheath structured blazar jets: It has been proposed that blazar jets are structured, with a fast spine
surrounded by a slower sheath or layer. This structured jet model explains some
properties of their emission and morphology. Because of their relative motion,
the radiation produced ... | astro-ph_HE |
Population Synthesis of Isolated Neutron Stars with magneto-rotational
evolution II: from radio-pulsars to magnetars: Population synthesis studies constitute a powerful method to reconstruct the
birth distribution of periods and magnetic fields of the pulsar population.
When this method is applied to populations in d... | astro-ph_HE |
Modelling the disk atmosphere of the low mass X-ray binary EXO 0748-676: Low mass X-ray binaries exhibit ionized emission from an extended disk
atmosphere that surrounds the accretion disk. However, its nature and geometry
is still unclear. In this work we present a spectral analysis of the extended
atmosphere of EXO 0... | astro-ph_HE |
A new possibility of the fast neutrino-flavor conversion in the
pre-shock region of core-collapse supernova: We make a strong case that the fast neutrino-flavor conversion, one of the
collective flavor oscillation modes, commonly occurs in core-collapse
supernovae (CCSNe). It is confirmed in the numerical data obtain... | astro-ph_HE |
Pre-burst neutrinos of gamma-ray bursters accompanied by high-energy
photons: Previous researches on high-energy neutrino events from gamma-ray bursters
(GRBs) suggest a neutrino speed variation $v(E)=c(1\pm
E/E^{\nu}_{\mathrm{LV}})$ with ${E}^{\nu}_{\rm LV}=(6.4\pm 1.5)\times10^{17}~{
\rm GeV}$, together with an int... | astro-ph_HE |
Long term study of the light curve of PKS 1510-089 in GeV energies: We have analyzed data from the Flat Spectrum Radio Quasar PKS 1510-089
collected over a period of 8 years from August 2008 to December 2016 with the
Fermi-LAT. We have identified several flares of this highly variable source,
studied their temporal and... | astro-ph_HE |
Radio impulsive events in quiet solar corona and Axion Quark Nugget Dark
Matter: The Murchison Widefield Array (MWA) recorded \cite{Mondal-2020} impulsive
radio events in the quiet solar corona at frequencies 98, 120, 132, and 160
MHz. We propose that these radio events are the direct manifestation of dark
matter ann... | astro-ph_HE |
A high-resolution view of the jets in 3C 465: We present new high-resolution and high-sensitivity studies of the jets in
the WAT source 3C 465, using deep transverse-resolved radio observations from
e-MERLIN, and with complementary observations from the VLA. We derive a lower
limit $\beta_{\rm j}$ = ($\nu_{\rm j}$/$c$)... | astro-ph_HE |
GRB 090510: a genuine short-GRB from a binary neutron star coalescing
into a Kerr-Newman black hole: In a new classification of merging binary neutron stars (NSs) we separate
short gamma-ray bursts (GRBs) in two sub-classes. The ones with
$E_{iso}\lesssim10^{52}$ erg coalesce to form a massive NS and are indicated as... | astro-ph_HE |
Dependence of the LMXB population on stellar age: We investigate the dependence of the low-mass X-ray binary (LMXB) population
in early-type galaxies on stellar age, by selecting 20 massive nearby
early-type galaxies from the Chandra archive occupying a relatively narrow
range of masses and spanning a broad range of ag... | astro-ph_HE |
Excitation of Trapped Waves in Simulations of Tilted Black Hole
Accretion Disks with Magnetorotational Turbulence: We analyze the time dependence of fluid variables in general relativistic,
magnetohydrodynamic simulations of accretion flows onto a black hole with
dimensionless spin parameter a/M=0.9. We consider both... | astro-ph_HE |
Energy function, formation rate and low-metallicity environment of fast
radio bursts: In this paper, we investigate the energy function, formation rate and
environment of fast radio bursts (FRBs) using Parkes sample and Australian
Square Kilometer Array Pathfinder (ASKAP) sample. For the first time, the
metallicity e... | astro-ph_HE |
The discovery of a rotating radio transient J1918$-$0449 with intriguing
emission properties with the five hundred meter aperture spherical radio
telescope: In this study, we report on a detailed single pulse analysis of the radio
emission from a rotating radio transient (RRAT) J1918$-$0449 which is the first
RRAT ... | astro-ph_HE |
UHECR: Signatures and Models: The signatures of Ultra High Energy (E >1 EeV) proton propagation through CMB
radiation are pair-production dip and GZK cutoff. The visible characteristics
of these two spectral features are ankle, which is intrinsic part of the dip,
beginning of GZK cutoff in the differential spectrum and... | astro-ph_HE |
Effective potential energy in St\ormer's problem for an inclined
rotating magnetic dipole: We discuss the dynamics of a charged nonrelativistic particle in
electromagnetic field of a rotating magnetized celestial body. The equations of
motion of the particle are obtained and some particular solutions are found.
Effec... | astro-ph_HE |
XMM-Newton and Swift observations of XTE J1743-363: XTEJ1743-363 is a poorly known hard X-ray transient, that displays short and
intense flares similar to those observed from Supergiant Fast X-ray Transients.
The probable optical counterpart shows spectral properties similar to those of
an M8 III giant, thus suggesting... | astro-ph_HE |
Evidence for simultaneous jets and disk winds in luminous low-mass X-ray
binaries: Recent work on jets and disk winds in low-mass X-ray binaries (LMXBs)
suggests that they are to a large extent mutually exclusive, with jets observed
in spectrally hard states and disk winds observed in spectrally soft states. In
this ... | astro-ph_HE |
Gamma-Ray Bursts at high and very high energies: Gamma-Ray Bursts (GRBs) are extra-galactic and extremely energetic transient
emissions of gamma rays, which are thought to be associated with the death of
massive stars or the merger of compact objects in binary systems. Their huge
luminosities involve the presence a new... | astro-ph_HE |
Constraints and prospects on gravitational wave and neutrino emission
using GW150914: The recent LIGO observation of gravitational waves from a binary black hole
merger triggered several follow-up searches from both electromagnetic wave as
well as neutrino observatories. Since in general, it is expected that all
matt... | astro-ph_HE |
Self Organized Criticality in an one dimensional magnetized grid.
Application to GRB X-ray afterglows: A simplified one dimensional grid is used to model the evolution of
magnetized plasma flow. We implement diffusion laws similar to those so-far
used to model magnetic reconnection with Cellular Automata. As a novelt... | astro-ph_HE |
Fluid Instabilities of Magnetar-Powered Supernovae: Magnetar-powered supernova explosions are competitive models for explaining
very luminous optical transits. However, these explosion models were mainly
calculated in 1D. Radiation emitted from the magnetar snowplows into the
previous supernovae ejecta and causes a non... | astro-ph_HE |
High-Energy gamma-ray Astronomy and String Theory: There have been observations, first from the MAGIC Telescope (July 2005) and
quite recently (September 2008) from the FERMI Satellite Telescope, on
non-simultaneous arrival of high-energy photons from distant celestial sources.
In each case, the highest energy photons ... | astro-ph_HE |
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