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A Search for Fast Optical Transients in the Pan-STARRS1 Medium-Deep
Survey: M Dwarf Flares, Asteroids, Limits on Extragalactic Rates, and
Implications for LSST: [Abridged] We present a search for fast optical transients (~0.5 hr-1 day)
using repeated observations of the Pan-STARRS1 Medium-Deep Survey (PS1/MDS)
fiel... | astro-ph_HE |
The Swift/BAT Hard X-ray Transient Monitor: The Swift/Burst Alert Telescope (BAT) hard X-ray transient monitor provides
near real-time coverage of the X-ray sky in the energy range 15-50 keV. The BAT
observes 88% of the sky each day with a detection sensitivity of 5.3 mCrab for
a full-day observation and a time resolut... | astro-ph_HE |
The High Time Resolution Universe Pulsar Survey - VII: discovery of five
millisecond pulsars and the different luminosity properties of binary and
isolated recycled pulsars: This paper presents the discovery and timing parameters for five millisecond
pulsars (MSPs), four in binary systems with probable white dwarf ... | astro-ph_HE |
Constraints on Proton Synchrotron Origin of Very High Energy Gamma Rays
from the Extended Jet of AP Librae: The multi-wavelength photon spectrum from the BL Lac object AP Librae extends
from radio to TeV gamma rays. The X-ray to very high energy gamma ray emission
from the extended jet of this source has been modeled... | astro-ph_HE |
A falling Corona model for the anomalous behavior of the broad emission
lines in NGC 5548: NGC 5548 has been intensively monitored by the AGN Space Telescope and
Optical Reverberation Mapping collaboration. Approximately after half of the
light curves, the correlation between the broad emission lines and the
lag-corr... | astro-ph_HE |
Swift X-ray and ultraviolet observations of the shortest orbital period
double-degenerate system RX J0806.3+1527 (HM Cnc): The system RX J0806.3+1527 (HM Cnc) is a pulsating X-ray source with 100 per
cent modulation on a period of 321.5 s (5.4 min). This period reflects the
orbital motion of a close binary consisting... | astro-ph_HE |
X-ray Spectroscopy of the gamma-ray Brightest Nova V906 Car
(ASASSN-18fv): Shocks in gamma-ray emitting classical novae are expected to produce bright
thermal and non-thermal X-rays. We test this prediction with simultaneous
NuSTAR and Fermi/LAT observations of nova V906 Car, which exhibited the
brightest GeV gamma-r... | astro-ph_HE |
Accretion disc by Roche lobe overflow in the supergiant fast X-ray
transient IGR J08408-4503: Supergiant fast X-ray transients (SFXTs) are X-ray binary systems with a
supergiant companion and likely a neutron star, which show a fast ($\sim 10^3$
s) and high variability with a dynamic range up to $10^{5-6}$. Given the... | astro-ph_HE |
What Powered the Kilonova-Like Emission After GRB 230307A in the
Framework of a Neutron Star-White Dwarf Merger?: The second brightest gamma-ray burst, GRB 230307A (with a duration $T_{90}$ ~
40 s), exhibited characteristics indicative of a magnetar engine during the
prompt emission phase. Notably, a suspected kilono... | astro-ph_HE |
The Knee and the Second Knee of the Cosmic-Ray Energy Spectrum: The cosmic ray flux measured by the Telescope Array Low Energy Extension
(TALE) exhibits three spectral features: the knee, the dip in the $10^{16}$ eV
decade, and the second knee. Here the spectrum has been measured for the first
time using fluorescence t... | astro-ph_HE |
Revisit of Local X-ray Luminosity Function of Active Galactic Nuclei
with the MAXI Extragalactic Survey: We construct a new X-ray (2--10 keV) luminosity function of Compton-thin
active galactic nuclei (AGNs) in the local universe, using the first MAXI/GSC
source catalog surveyed in the 4--10 keV band. The sample cons... | astro-ph_HE |
The influence of outflows on the 1/f-like luminosity fluctuations: In accretion systems, outflows may have significant influence on the
luminosity fluctuations. In this paper, following the Lyubarskii's general
scheme, we revisit the power spectral density of luminosity fluctuations by
taking into account the role of o... | astro-ph_HE |
Evolution of the X-ray Properties of the Transient Magnetar XTE
J1810-197: We report on X-ray observations of the 5.54 s transient magnetar XTE
J1810-197 using the XMM-Newton and Chandra observatories, analyzing new data
from 2008 through 2014, and re-analyzing data from 2003 through 2007 with the
benefit of these si... | astro-ph_HE |
Resonant scattering in the Perseus Cluster: spectral model for
constraining gas motions with Astro-H: X-ray spectra from cores of galaxy clusters can be strongly distorted by
resonant scattering of line photons, affecting metal abundance and gas velocity
measurements. We introduce simulated spectral models that take ... | astro-ph_HE |
Constraints on MeV dark matter and primordial black holes: Inverse
Compton signals at the SKA: We investigate the possibilities for probing MeV dark matter (DM) particles
and primordial black holes (PBHs) (for masses $\sim 10^{15}$--$10^{17}$ g) at
the upcoming radio telescope SKA, using photon signals from the Inver... | astro-ph_HE |
Three-flavor collective neutrino conversions with multi-azimuthal-angle
instability in an electron-capture supernova model: We investigate the multi-azimuthal angle (MAA) effect on collective neutrino
oscillation by considering the three-dimensional neutrino momentum distribution
in a realistic electron-capture super... | astro-ph_HE |
Possible role of magnetic reconnection in the electromagnetic
counterpart of binary black hole merger: We propose a qualitative scenario to interpret the argued association between
the direct measurement of the gravitational wave event GW150914 by Laser
Interferometer Gravitational Wave Observatory (LIGO)-Virgo colla... | astro-ph_HE |
The Ultra-Fast Outflow of the Quasar PG 1211+143 as Viewed by
Time-Averaged Chandra Grating Spectroscopy: We present a detailed X-ray spectral study of the quasar PG 1211+143 based on
Chandra High Energy Transmission Grating Spectrometer (HETGS) observations
collected in a multi-wavelength campaign with UV data using... | astro-ph_HE |
AKARI Near-infrared Spectral Observations of Shocked H2 Gas of the
Supernova Remnant IC 443: We present near-infrared (2.5 - 5.0 um) spectra of shocked H2 gas in the
supernova remnant IC 443, obtained with the satellite AKARI. Three shocked
clumps-known as B, C, and G-and one background region were observed, and only... | astro-ph_HE |
Magnetic-Field Amplification in the Thin X-ray Rims of SN1006: Several young supernova remnants (SNRs), including SN1006, emit synchrotron
X-rays in narrow filaments, hereafter thin rims, along their periphery. The
widths of these rims imply 50 to 100 $\mu$G fields in the region immediately
behind the shock, far larger... | astro-ph_HE |
Supernova Shock Breakout Through a Wind: The breakout of a supernova shock wave through the progenitor star's outer
envelope is expected to appear as an X-ray flash. However, if the supernova
explodes inside an optically-thick wind, the breakout flash is delayed. We
present a simple model for estimating the conditions ... | astro-ph_HE |
Observations of High-Energy Gamma-Ray Emission Toward the Galactic
Centre with the Fermi Large Area Telescope: The inner region of the Milky Way is one of the most interesting and complex
regions of the gamma-ray sky. The intense interstellar emission and resolved
point sources, as well as potential contributions by ... | astro-ph_HE |
Constraining black hole spins with low-frequency quasi-periodic
oscillations in soft states: Black hole X-ray transients show a variety of state transitions during their
outburst phases, characterized by changes in their spectral and timing
properties. In particular, power density spectra (PDS) show quasi periodic
os... | astro-ph_HE |
Why not any tau double bang in Icecube, yet?: High Energy Neutrino Astronomy has been revealed by a sudden change in the
flavor composition around maximal energies since three years of recording in
ice km detector. However these discover didn' t led to any clear promised
Neutrino Astronomy land yet. No correlation with... | astro-ph_HE |
Vertical Structure of Neutrino Dominated Accretion Disks and Neutrino
Transport in the disks: We investigate the vertical structure of neutrino dominated accretion disks
by self-consistently considering the detailed microphysics, such as the
neutrino transport, vertical hydrostatic equilibrium, the conservation of
le... | astro-ph_HE |
Optical Afterglows and IGM Attenuation: Because of their cosmological origin, gamma-ray burst (GRB) optical
afterglows are attenuated when they pass intergalactic absorbers in the GRB
line-of-sight. Without the knowledge of the number of absorbers and their
physical properties, the effect of absorption on the observed ... | astro-ph_HE |
First combined studies on Lorentz Invariance Violation from observations
of astrophysical sources: Imaging Atmospheric Cherenkov Telescopes study the highest energy (up to tens
of TeV) photon emission coming from nearby and distant astrophysical sources,
thus providing valuable results from searches for Lorentz Invar... | astro-ph_HE |
Interpreting the relation between the gamma-ray and infrared
luminosities of star-forming galaxies: It has been found that there is a quasi-linear scaling relationship between
the gamma-ray luminosity in GeV energies and the total infrared luminosity of
star-forming galaxies, i.e. $L_{\gamma}\propto L_{\rm IR}^{\alph... | astro-ph_HE |
A search for fast radio burst-like emission from Fermi gamma-ray bursts: We report the results of the rapid follow-up observations of gamma-ray bursts
(GRBs) detected by the Fermi satellite to search for associated fast radio
bursts. The observations were conducted with the Australian Square Kilometre
Array Pathfinder ... | astro-ph_HE |
Observational signatures of stellar explosions driven by relativistic
jets: The role of relativistic jets in unbinding the stellar envelope during a
supernova (SN) associated with a gamma-ray burst (GRB) is unclear. To study
that, we explore observational signatures of stellar explosions that are driven
by jets. We f... | astro-ph_HE |
The luminosity function and the rate of Swift's Gamma Ray Bursts: We invert directly the redshift - luminosity distribution of observed long
Swift GRBs to obtain their rate and luminosity function. Our best fit rate is
described by a broken power law that rises like (1+z)^2.1{+0.5-0.6} for 0<z<3
and decrease like (1+z)... | astro-ph_HE |
The optical noise monitoring systems of Lake Baikal environment for the
Baikal-GVD telescope: We present data on the luminescence of the Baikal water medium collected with
the Baikal-GVD neutrino telescope. This three-dimensional array of light
sensors allows the observation of time and spatial variations of the ambi... | astro-ph_HE |
Deexcitation nuclear gamma-ray line emission from low-energy cosmic rays
in the inner Galaxy: Recent observations of high ionization rates of molecular hydrogen in diffuse
interstellar clouds point to a distinct low-energy cosmic-ray component.
Supposing that this component is made of nuclei, two models for the origi... | astro-ph_HE |
Revealing Double White Dwarf Mergers with Multi-messenger Signals: A significant number of double white dwarfs (DWDs) are believed to merge
within the Hubble time due to the gravitational wave (GW) emission during their
inspiraling phase. The outcome of a DWD system is either a type Ia Supernova as
the double-degenerat... | astro-ph_HE |
Swift Observations of Hard X-ray Emitting White Dwarfs in Symbiotic
Stars: The X-ray emission from most accreting white dwarfs (WDs) in symbiotic binary
stars is quite soft. Several symbiotic WDs, however, produce strong X-ray
emission at energies greater than ~20 keV. The Swift BAT instrument has
detected hard X-ray... | astro-ph_HE |
Supernova 2013by: A Type IIL Supernova with a IIP-like light curve drop: We present multi-band ultraviolet and optical light curves, as well as
visual-wavelength and near-infrared spectroscopy of the Type II linear (IIL)
supernova (SN) 2013by. We show that SN 2013by and other SNe IIL in the
literature, after their line... | astro-ph_HE |
Signatures of the disk-jet coupling in the Broad-line Radio Quasar
4C+74.26: Here we explore the disk-jet connection in the broad-line radio quasar
4C+74.26, utilizing the results of the multiwavelength monitoring of the
source. The target is unique in that its radiative output at radio wavelengths
is dominated by a ... | astro-ph_HE |
Status of the Lunar Detection Mode for Cosmic Particles of LOFAR: Cosmic particles hitting Earth's moon produce radio emission via the Askaryan
effect. If the resulting radio ns-pulse can be detected by radio telescopes,
this technique potentially increases the available collective area for ZeV
scale particles by sever... | astro-ph_HE |
On the Polarized Absorption Lines in Gamma-ray Burst Optical Afterglows: Spectropolarimetric measurements of gamma-ray burst (GRB) optical afterglows
contain polarization information for both continuum and absorption lines. Based
on the Zeeman effect, an absorption line in a strong magnetic field is
polarized and split... | astro-ph_HE |
Observation of the Crab Nebula with the HAWC Gamma-Ray Observatory: The Crab Nebula is the brightest TeV gamma-ray source in the sky and has been
used for the past 25 years as a reference source in TeV astronomy, for
calibration and verification of new TeV instruments. The High Altitude Water
Cherenkov Observatory (HAW... | astro-ph_HE |
The Intrinsic Properties of Multiwavelength Energy Spectra for Fermi
Teraelectronvolt Blazars: In this paper, we have selected a sample of 64 teraelectronvolt blazars, with
redshift, from those classified in the fourth Fermi Large Area Telescope source
catalog\footnote{\url{https://fermi.gsfc.nasa.gov/ssc/data/access... | astro-ph_HE |
Bayesian Analysis of Hybrid EoS based on Astrophysical Observational
Data: We perform a Bayesian analysis of probability measures for compact star
equations of state using new, disjunct constraints for mass and radius. The
analysis uses a simple parametrization for hybrid equations of state to
investigate the possibi... | 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 |
X-ray nova MAXI J1828-249. Evolution of the broadband spectrum during
its 2013-2014 outburst: Based on data from the SWIFT, INTEGRAL, MAXI/ISS orbital observatories, and
the ground-based RTT-150 telescope, we have investigated the broadband (from
the optical to the hard X-ray bands) spectrum of the X-ray nova MAXI J1... | astro-ph_HE |
X-rays from the episodic dust maker WR 137: We present an analysis of the XMM-Newton observation of the episodic dust
maker WR 137. Global spectral fits show that its X-ray spectrum is well matched
by a two-temperature optically-thin plasma emission (kT_1 ~ 0.4 keV and kT_2 ~
2.2 keV). If we adopt the colliding stellar... | astro-ph_HE |
The evaporating primordial black hole fraction in cool-core galaxy
clusters: Recent studies of gamma-ray, cosmic-ray and radio data put stringent
constraints on the fraction of primordial black holes (PBHs) in our universe.
In this article, we propose a new indirect method in using the X-ray luminosity
data of cool-c... | astro-ph_HE |
The GMRT High Resolution Southern Sky Survey for pulsars and transients
-- VI: Discovery of nulling, localisation and timing of PSR J1244-4708: Many pulsars in the known population exhibit nulling, which is characterised
by a sudden cessation and subsequent restoration of radio emission. In this
work, we present the ... | astro-ph_HE |
Constraints on UHECR sources and extragalactic magnetic fields from
directional anisotropies: A dipole anisotropy in ultra-high-energy cosmic ray (UHECR) arrival
directions, of extragalactic origin, is now firmly established at energies E >
8 EeV. Furthermore, the UHECR angular power spectrum shows no power at smalle... | astro-ph_HE |
Data-driven extrapolation schemes of Fermi-LAT spectra to the VHE: After 10 years of operations of the Large Area Telescope (LAT), a high-energy
pair-creation telescope onboard the Fermi satellite, the Fermi Collaboration
has produced two major catalogs: the 4FGL and the 3FHL. These catalogs
represent the best sample o... | astro-ph_HE |
Evidence of a Hadronic Origin for the TeV Source J1834-087: We report on the discovery of compact, narrow OH line emission from the
hydroxl molecule at 1720 MHz toward the extended TeV source J1834-087. The
origin of this high energy emission is unknown; it could be powered by one or
more candidate neutron stars (lepto... | astro-ph_HE |
An XMM-Newton view of the dipping low-mass X-ray binary XTE J1710-281: (abridged) We analyzed the archived XMM-Newton observation of the poorly
studied low-mass X-ray binary XTE J1710-281 performed in 2004 that covered one
orbital period of the system (3.8 hr). The source shows dips as well as
eclipses, hence it is vie... | astro-ph_HE |
The Morphology and Dynamics of Relativistic Jets with Relativistic
Equation of State: We study the effect of plasma composition on the dynamics and morphology of
the relativistic astrophysical jets. Our work is based on a relativistic total
variation diminishing (TVD) simulation code. We use a relativistic equation o... | astro-ph_HE |
Sensitivity of the correlation between the depth of shower maximum and
the muon shower size to the cosmic ray composition: The composition of ultra-high energy cosmic rays is an important issue in
astroparticle physics research, and additional experimental results are
required for further progress. Here we investigat... | astro-ph_HE |
Kinematics of Parsec-Scale Jets of Gamma-Ray Bright Blazars at 43 GHz
during Ten Years of the VLBA-BU-BLAZAR Program: We analyze the parsec-scale jet kinematics from 2007 June to 2018 December of
a sample of $\gamma$-ray bright blazars monitored roughly monthly with the Very
Long Baseline Array at 43 GHz under the VL... | astro-ph_HE |
Late Afterglow Bump/Plateau around the Jet Break: Signature of a
free-to-shocked wind Environment in Gamma-ray Burst: A number of gamma-ray bursts (GRBs) exhibit the late simultaneous bumps in
their optical and Xray afterglows around the jet break. Its origin is unclear.
Based on the following two facts, we suggest t... | astro-ph_HE |
An Occultation Event in Centaurus A and the Clumpy Torus Model: We have analyzed 16 months of sustained monitoring observations of Cen A from
the Rossi X-ray Timing Explorer to search for changes in the absorbing column
in the line of sight to the central nucleus. We present time-resolved
spectroscopy which indicates t... | astro-ph_HE |
Cosmic Evolution of Stellar-mass Black Hole Merger Rate in Active
Galactic Nuclei: Binary black hole mergers encode information about their environment and the
astrophysical processes that led to their formation. Measuring the redshift
dependence of their merger rate will help probe the formation and evolution of
gal... | astro-ph_HE |
Reapproaching the Spin Estimate of GX 339-4: We systematically reanalyze two previous observations of the black hole (BH)
GX 339-4 in the very high and intermediate state taken with $\emph{XMM-Newton}$
and $\emph{Suzaku}$. We utilize up-to-date data reduction procedures and
implement the recently developed, self-consis... | astro-ph_HE |
Unraveling the Geometry of the Crab Nebula's "Inner Ring": Chandra images of the Crab Nebula resolve the detailed structure of its
"inner ring", possibly a termination shock where pulsar-accelerated
relativistic particles begin to emit X radiation. Analysis of these images
finds that the center of the ellipse-presumabl... | astro-ph_HE |
Low metallicity natal environments and black hole masses in
Ultraluminous X-ray Sources: We review the available estimates of the masses of the compact object in
Ultraluminous X-ray Sources (ULXs) and critically reconsider the stellar-mass
versus intermediate-mass black hole interpretations. Black holes of several
hu... | astro-ph_HE |
Overview of MHz air shower radio experiments and results: In this paper, I present a review of the main results obtained in the last 10
years in the field of radio-detection of cosmic-ray air showers in the MHz
range. All results from all experiments cannot be reported here so that I will
focus on the results more than... | astro-ph_HE |
Neutron Stars with realistic EoS in f(R) theories of gravity: In this paper, we examine neutron star structure in perturbative $f(R)$
gravity models with realistic equation of state. We obtain mass-radius
relations in two gravity models of the form $f_{1}(R)=R+ \alpha
R(e^{-R/R_0}-1)$ and $f_{2}(R)=R+\alpha R^2$. For t... | astro-ph_HE |
Light Curve Modeling of Superluminous Supernova 2006gy: Collision
between Supernova Ejecta and Dense Circumstellar Medium: We show model light curves of superluminous supernova 2006gy on the
assumption that the supernova is powered by the collision of supernova ejecta
and its dense circumstellar medium. The initial c... | astro-ph_HE |
diffSph: a Python tool to compute diffuse signals from dwarf spheroidal
galaxies: So far no diffuse emissions in dwarf spheroidal satellites of the Milky Way
have ever been observed. Given that dwarf galaxies are predominantly composed
of Dark Matter, the discovery of these signals could offer valuable insights
into ... | astro-ph_HE |
A Comparative Study of Long and Short GRBs. I. Overlapping Properties: Gamma ray bursts (GRBs) are classified into long and short categories based
on their durations. Broad band studies suggest that these two categories of
objects roughly correspond to two different classes of progenitor systems, i.e.
compact star merg... | astro-ph_HE |
A Bayesian test for periodic signals in red noise: Many astrophysical sources, especially compact accreting sources, show
strong, random brightness fluctuations with broad power spectra in addition to
periodic or quasi-periodic oscillations (QPOs) that have narrower spectra. The
random nature of the dominant source of ... | astro-ph_HE |
The puzzling symbiotic X-ray system 4U1700+24: Symbiotic X-ray binaries form a subclass of low-mass X-ray binary systems
consisting of a neutron star accreting material from a red giant donor star via
stellar wind or Roche lobe overflow. Only a few confirmed members are currently
known; 4U 1700+24 is a good candidate a... | astro-ph_HE |
The Swift Serendipitous Survey in deep XRT GRB fields (SwiftFT) I. The
X-ray catalog and number counts: We searched for X-ray serendipitous sources in over 370 Swift-XRT fields
centered on gamma ray bursts detected between 2004 and 2008 and observed with
total exposures ranging from 10 ks to over 1 Ms. This defines t... | astro-ph_HE |
Solar Wind Charge Exchange contribution to the ROSAT All Sky Survey Maps: DXL (Diffuse X-ray emission from the Local Galaxy) is a sounding rocket
mission designed to estimate the contribution of Solar Wind Charge eXchange
(SWCX) to the Diffuse X-ray Background (DXB) and to help determine the
properties of the Local Hot... | astro-ph_HE |
Modeling the oxygen K absorption in the interstellar medium: an {\it
XMM}-Newton view of Sco X-1: We investigate the absorption structure of the oxygen in the interstellar
medium by analyzing {\it XMM}-Newton observations of the low mass X-ray binary
Sco X-1. We use simple models based on the O {\sc i} atomic cross s... | astro-ph_HE |
VERITAS Observations of the Unidentified Point Source HESS J1943+213: The H.E.S.S. Galactic plane scan has revealed a large population of Galactic
very high energy (VHE; E > 100 GeV) emitters. The majority of the galactic
sources are extended and can typically be associated with pulsar wind nebulae
(35%) and supernova ... | astro-ph_HE |
Gravitational waves from the Papaloizou-Pringle instability in black
hole-torus systems: Black hole (BH)--torus systems are promising candidates for the central
engine of gamma-ray bursts (GRBs), and also possible outcomes of the collapse
of supermassive stars to supermassive black holes (SMBHs). By three-dimensional... | astro-ph_HE |
2D radiation-hydrodynamic simulations of supernova ejecta with a central
power source: We present the results of two-dimensional radiation-hydrodynamic simulations
of expanding supernova ejecta with a central energy source. As suggested in
previous multi-dimensional hydrodynamic simulations, a sufficiently powerful
c... | astro-ph_HE |
Neutrino and cosmic-ray emission from multiple internal shocks in
gamma-ray bursts: Gamma-ray bursts are short-lived, luminous explosions at cosmological
distances, thought to originate from relativistic jets launched at the deaths
of massive stars. They are among the prime candidates to produce the observed
cosmic r... | astro-ph_HE |
Uncloaking hidden repeating fast radio bursts with unsupervised machine
learning: The origins of fast radio bursts (FRBs), astronomical transients with
millisecond timescales, remain unknown. One of the difficulties stems from the
possibility that observed FRBs could be heterogeneous in origin; as some of
them have b... | astro-ph_HE |
A statistical analysis of the "heartbeat" behaviour of GRS 1915+105: GRS 1915+105 has been active for more than 26 years since it was discovered
in 1992. There are hundreds of RXTE pointed observations on this source, and
the quasi-regular flares with a slow rise and a sharp decrease (i.e. the
"heartbeat" state) were r... | astro-ph_HE |
Subphotospheric emission from short gamma-ray bursts: Protons mold the
multi-messenger signals: The origin of the observed Band-like photon spectrum in short gamma-ray
bursts (sGRBs) is a long-standing mystery. We carry out the first general
relativistic magnetohydrodynamic simulation of a sGRB jet with initial
magne... | astro-ph_HE |
TRAPUM discovery of thirteen new pulsars in NGC 1851 using MeerKAT: We report the discovery of 13 new pulsars in the globular cluster NGC 1851 by
the TRAPUM Large Survey Project using the MeerKAT radio telescope. The
discoveries consist of six isolated millisecond pulsars (MSPs) and seven binary
pulsars, of which six a... | astro-ph_HE |
Disc-corona interaction in the heartbeat state of GRS 1915+105: Timing analysis provides information about the dynamics of matter accreting
on to neutron stars and black holes, and hence is crucial for studying the
physics of the accretion flow around these objects. It is difficult, however,
to associate the different ... | astro-ph_HE |
Evidence for gravitational lensing of GRB 200716C: Observationally, there is a small fraction of Gamma-ray bursts (GRBs) with
prompt emission observed by Fermi/GBM that are composed of two pulses.
Occasionally, the distance to a GRB may be lensed when a high mass
astrophysical object resides in the path between the GRB... | astro-ph_HE |
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_HE |
Light curves and spectra from off-axis gamma-ray bursts: If gamma-ray burst prompt emission originates at a typical radius, and if
material producing the emission moves at relativistic speed, then the
variability of the resulting light curve depends on the viewing angle. This is
due to the fact that the pulse evolution... | astro-ph_HE |
Seven Years with the Swift Supergiant Fast X-ray Transients Project: Supergiant Fast X-ray Transients (SFXTs) are HMXBs with OB supergiant
companions. I review the results of the Swift SFXT Project, which since 2007
has been exploiting Swift's capabilities in a systematic study of SFXTs and
supergiant X-ray binaries (S... | astro-ph_HE |
A Genetic Algorithm for Astroparticle Physics Studies: Precision measurements of charged cosmic rays have recently been carried out
by space-born (e.g. AMS-02), or ground experiments (e.g. HESS). These measured
data are important for the studies of astro-physical phenomena, including
supernova remnants, cosmic ray prop... | astro-ph_HE |
Optical Counterparts of ULXs and Their Host Environments in NGC
4490/4485: We report the identification of the possible optical counterparts of five out
of seven Ultraluminous X-ray Sources (ULXs) in NGC 4490/4485 galaxy pair. Using
archival Hubble Space Telescope ({\it HST}) imaging data, we identified a
single opti... | astro-ph_HE |
Radio WISSH: tuning on the most luminous quasars in the Universe: In the past years, the results obtained by the WISSH quasar project provided
a novel general picture on the distinctive multi-band properties of
hyper-luminous ($L_{bol}>10^{47}$ erg/s) quasars at high redshift (z$\sim$2-4),
unveiling interesting relatio... | astro-ph_HE |
Contribution to the Extragalactic Gamma-ray Background from the Cascades
of Very-high Energy Gamma Rays: As very-high--energy photons propagate through the extragalactic background
light (EBL), they interact with the soft photons and initiate electromagnetic
cascades of lower energy photons and electrons. The collect... | astro-ph_HE |
A young SNR illuminating nearby Molecular Clouds with cosmic rays: The Supernova Remnant (SNR) HESS J1731-347 displays strong non-thermal TeV
gamma-ray and X-ray emission, thus the object is at present time accelerating
particles to very high energies. A distinctive feature of this young SNR is the
nearby (~30 pc in pr... | astro-ph_HE |
SN 2015an: a normal luminosity type II supernova with low expansion
velocity at early phases: We present the photometry and spectroscopy of SN 2015an, a Type II Supernova
(SN) in IC 2367. The recombination phase of the SN lasts up to $\sim$120 d,
with a decline rate of 1.24 mag/100d, higher than the typical SNe IIP. ... | astro-ph_HE |
Early-time VLA observations and broad-band afterglow analysis of the
Fermi-LAT detected GRB 130907A: We present multi-wavelength observations of the hyper-energetic gamma-ray
burst (GRB) 130907A, a Swift-discovered burst with early radio observations
starting at $\approx 4$ hr after the $\gamma$-ray trigger. GRB 1309... | astro-ph_HE |
Fornax A, Centaurus A and other radio galaxies as sources of ultra-high
energy cosmic rays: The origin of ultra-high energy cosmic rays (UHECRs) is still unknown. It has
recently been proposed that UHECR anisotropies can be attributed to starburst
galaxies or active galactic nuclei. We suggest that the latter is more... | astro-ph_HE |
Gamma Ray Signal from the Pulsar Wind in the Binary Pulsar system PSR
B1259-63/LS2883: Binary pulsar systems emit potentially detectable components of gamma ray
emission due to Comptonization of the optical radiation of the companion star
by relativistic electrons of the pulsar wind, both before and after termination... | astro-ph_HE |
First observation of PeV-energy neutrinos with IceCube: We report on the observation of two neutrino-induced events which have an
estimated deposited energy in the IceCube detector of 1.04 $\pm$ 0.16 and 1.14
$\pm$ 0.17 PeV, respectively, the highest neutrino energies observed so far.
These events are consistent with f... | astro-ph_HE |
Properties of neutrino transfer in a deformed remnant of neutron star
merger: We study properties of neutrino transfer in a remnant of neutron star merger,
consisting of a massive neutron star and a surrounding torus. We perform
numerical simulations of the neutrino transfer by solving the Boltzmann
equation with mom... | astro-ph_HE |
Investigation of the particle-particle interaction effects in the cosmic
Zevatron based on cyclotron auto-resonance by particle-in-cell simulations: Cyclotron autoresonance acceleration has been recently advanced as a
potential mechanism for accelerating nuclei to ZeV energies (1 ZeV = $10^{21}$
eV). All results have... | astro-ph_HE |
Search for Tens of MeV Neutrinos associated with Gamma-Ray Bursts in
Super-Kamiokande: A search for neutrinos produced in coincidence with Gamma-Ray Bursts(GRB) was
conducted with the Super-Kamiokande (SK) detector. Between December 2008 and
March 2017, the Gamma-ray Coordinates Network recorded 2208 GRBs that occurr... | astro-ph_HE |
On the Particle Acceleration Mechanisms in a Double Radio Relic Galaxy
Cluster, Abell 1240: We present a 368 ks deep Chandra observation of Abell~1240, a binary merging
galaxy cluster at a redshift of 0.195 with two Brightest Cluster Galaxies
(BCGs) may have passed each other 0.3 Gyr ago. Building upon previous
inves... | astro-ph_HE |
Different behaviors of wavelet results for type-B and type-C QPOs of
MAXI J1535-571 based on NICER data: Wavelet analysis, in addition to power density spectra, is another method to
study the quasi-periodic signals in the light curves, but has been rarely used
in black hole X-ray transients. We performed wavelet anal... | astro-ph_HE |
Non-Maxwellian electron distributions in clusters of galaxies: Thermal X-ray spectra of clusters of galaxies and other sources are commonly
calculated assuming Maxwellian electron distributions. There are situations
where this approximation is not valid, for instance near interfaces of hot and
cold gas and near shocks.... | astro-ph_HE |
A Compton-thin Solution for the Suzaku X-ray Spectrum of the Seyfert 2
Galaxy Mkn 3: Mkn 3 is a Seyfert 2 galaxy that is widely regarded as an exemplary
Compton-thick AGN. We study the Suzaku X-ray spectrum using models of the X-ray
reprocessor that self-consistently account for the Fe K$\alpha$ fluorescent
emission ... | astro-ph_HE |
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