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Directional association of TeV to PeV astrophysical neutrinos with radio
blazars: Recently we have shown that high-energy neutrinos above 200 TeV detected by
IceCube are produced within several parsecs in the central regions of
radio-bright blazars, that is active galactic nuclei with jets pointing towards
us. To ind... | astro-ph_HE |
Lunar gamma ray emission seen during the first year by Fermi: We report the detection of the lunar gamma-ray emission during the first year
of Fermi-LAT observations. Such emission is produced by cosmic ray nuclei
interacting with the lunar surface. Thanks to the solar minimum conditions and
the reduced effects of heli... | astro-ph_HE |
XMM-Newton Observes the Intrabinary Shock of PSR J1959+2048: In a multi-orbit (100 ks) $\mathrm{\it XMM-Newton}$ exposure of the original
black widow pulsar, PSR J1959+2048, we measure the strong orbital modulation
caused by intrabinary shock (IBS) emission. The IBS light curve peak appears
asymmetric, which we attribu... | astro-ph_HE |
Optical quasi-periodic oscillation and color behavior of blazar PKS
2155-304: PKS 2155-304 is a well studied BL Lac object in the southern sky. The
historical optical data during different period have been collected and
compiled. Light curves with a time span of 35 years have been constructed. The
R-band light curve ... | astro-ph_HE |
No X-Ray Excess from the HESS J1741-302 Region except a New Intermediate
Polar Candidate: With the Suzaku satellite, we observed an unidentified TeV gamma-ray source
HESS J1741$-$302 and its surroundings. No diffuse or point-like X-ray sources
are detected from the bright southern emission peak of HESS J1741$-$302. F... | astro-ph_HE |
MC Simulations of the Broadband Spectra of Sagittarius A* through the
use of GRMHD: We present results of simulations of the spectrum of the accretion flow onto
the supermassive black hole in our Galactic Centre, Sagittarius A*, generated
with a coupling of Monte-Carlo (MC) radiation and general relativistic
magnetoh... | astro-ph_HE |
Radio Constraints on $r$-process Nucleosynthesis by Collapsars: The heaviest elements in the Universe are synthesized through rapid neutron
capture ($r$-process) in extremely neutron rich outflows. Neutron star mergers
were established as an important $r$-process source through the multi-messenger
observation of GW1708... | astro-ph_HE |
TeV gamma-ray survey of the northern sky using the ARGO-YBJ experiment: The ARGO-YBJ experiment is an extensive air shower array with full coverage
RPC detectors located at Yangbajing (4300 m asl, Tibet, China). It is operated
with high duty cycle (>86%) and a large field of view ($\sim$ 2sr). It
continuously monitors ... | astro-ph_HE |
Constraining properties of neutron star merger outflows with radio
observations: The jet opening angle and inclination of GW170817 -- the first detected
binary neutron star merger -- were vital to understand its energetics, relation
to short gamma-ray bursts, and refinement of the standard siren-based
determination o... | astro-ph_HE |
An accurate and efficient numerical calculation of detonation waves in
multidimensional supernova simulations using a burning limiter and adaptive
quasi-statistical equilibrium: Resolving the small length-scale of thermonuclear detonation waves (TNDWs) in
supernovae is currently not possible in multidimensional ful... | astro-ph_HE |
Hydrodynamics of Young Supernova Remnants and the Implications for their
Gamma-ray emission: Supernovae (SNe) are generally classified into Type I and Type II. Most SNe
(~ 80%), including all the subtypes of Type II, and Type Ib/c, arise from the
core-collapse of massive stars. During their lifetime, mass-loss from t... | astro-ph_HE |
Echo-Mapping of Swift J1753.5-0127: We present two epochs of coordinated X-ray-optical timing observations of the
black hole candidate Swift J1753.5-0127 during its 2005 outburst. The first
epoch in July occurred at outburst peak. Two consecutive nights of observations
using the McDonald Observatory Argos camera with t... | astro-ph_HE |
Rates of Stellar Tidal Disruption as Probes of the Supermassive Black
Hole Mass Function: Rates of stellar tidal disruption events (TDEs) by supermassive black holes
(SMBHs) due to two-body relaxation are calculated using a large galaxy sample
(N=146) in order to explore the sensitivity of the TDE rates to observatio... | astro-ph_HE |
Mergers of binary neutron star systems: a multi-messenger revolution: On 17 August 2017, less than two years after the direct detection of
gravitational radiation from the merger of two ~30 Msun black holes, a binary
neutron star merger was identified as the source of a gravitational wave signal
of ~100 s duration that... | astro-ph_HE |
Late-time radio observations of the short GRB200522A: constraints on the
magnetar model: GRB200522A is a short duration gamma-ray burst (GRB) at redshift $z$=0.554
characterized by a bright infrared counterpart. A possible, although not
unambiguous, interpretation of the observed emission is the onset of a luminous
k... | astro-ph_HE |
Associating Fast Radio Bursts with Extragalactic Radio Sources: General
Methodology and a Search for a Counterpart to FRB 170107: The discovery of a repeating fast radio burst has led to the first precise
localization, an association with a dwarf galaxy, and the identification of a
coincident persistent radio source.... | astro-ph_HE |
The TANAMI Multiwavelength Program: Dynamic SEDs of Southern Blazars: Simultaneous broadband spectral and temporal studies of blazars are an
important tool for investigating active galactic nuclei (AGN) jet physics. We
study the spectral evolution between quiescent and flaring periods of 22
radio-loud AGN through multi... | astro-ph_HE |
From Supernova to Remnant: Tracking the Evolution of the Oldest Known
X-ray Supernovae: Core-collapse supernovae (SNe) expand into a medium created by winds from the
pre-SN progenitor. The SN explosion and resulting shock wave(s) heat up the
surrounding plasma, giving rise to thermal X-ray emission, which depends on ... | astro-ph_HE |
An Exploration of X-ray Supernova Remnants in the Milky Way and Nearby
Galaxies: We probe the environmental properties of X-ray supernova remnants (SNRs) at
various points along their evolutionary journey, especially the S-T phase, and
their conformance with theoretically derived models of SNR evolution. The
remnant ... | astro-ph_HE |
Unusual Emission Variations Near the Eclipse of A Black Widow PSR
J1720$-$0533: We report on an {unusually} bright observation of PSR J1720$-$0533 using the
Five-hundred-meter Aperture Spherical radio Telescope (FAST). The pulsar is in
a black widow system that {was discovered by the Commensal Radio Astronomy FAST
Su... | astro-ph_HE |
A Survey of Fermi Catalog Sources using data from the Milagro Gamma-Ray
Observatory: The Fermi LAT has released a list of the most significant 205 sources with
three months of Fermi data (Bright Source List). The Milagro Gamma-Ray
Observatory is sensitive to gamma rays above 100 GeV with a peak sensitivity
between 10... | astro-ph_HE |
The first 48: Discovery and progenitor constraints on the Type Ia
supernova 2013gy: We present an early-phase $g$-band light curve and visual-wavelength spectra
of the normal Type Ia supernova (SN) 2013gy. The light curve is constructed by
determining the appropriate S-corrections to transform KAIT natural-system $B$... | astro-ph_HE |
X-ray Emission from SN 2012ca: A Type Ia-CSM Supernova Explosion in a
Dense Surrounding Medium: X-ray emission is one of the signposts of circumstellar interaction in
supernovae (SNe), but until now, it has been observed only in core-collapse
SNe. The level of thermal X-ray emission is a direct measure of the density... | astro-ph_HE |
Semi-implicit scheme for treating radiation under M1 closure in general
relativistic conservative fluid dynamics codes: A numerical scheme is described for including radiation in multi-dimensional
general-relativistic conservative fluid dynamics codes. In this method, a
covariant form of the M1 closure scheme is used... | astro-ph_HE |
Gas perturbations in cool cores of galaxy clusters: effective equation
of state, velocity power spectra and turbulent heating: We present the statistical analysis of X-ray surface brightness and gas
density fluctuations in cool cores of ten, nearby and bright galaxy clusters
that have deep Chandra observations and sh... | astro-ph_HE |
Variability of the X-ray Broad Iron Spectral Features in Active Galactic
Nuclei and Black-hole Binaries: The "broad iron spectral features" are often seen in X-ray spectra of Active
Galactic Nuclei (AGN) and black-hole binaries (BHB). These features may be
explained either by the "relativistic disc reflection" scenar... | astro-ph_HE |
Upper Limit on Correlated Current Variations in the Crab Pulsar: The high energy emission of rotation powered pulsars is supposed to be
produced in "gaps" in the pulsar magnetosphere where charges are accelerated
and currents are produced. The rest of the magnetosphere is supposed to be
mostly a "force-free" plasma wit... | astro-ph_HE |
A multi-wavelength study of the hard and soft states of MAXI J1820+070
during its 2018 outburst: We present a comprehensive multi-wavelength spectral analysis of the black
hole X-ray binary MAXI J1820+070 during its 2018 outburst, utilizing AstroSat
far UV, soft and hard X-ray data, along with (quasi-)simultaneous op... | astro-ph_HE |
The Effect of a Cosmic Ray Precursor in SN 1006?: Like many young supernova remnants, SN 1006 exhibits what appear to be clumps
of ejecta close to or protruding beyond the main blast wave. In this paper we
examine 3 such protrusions along the east rim. They are semi-aligned with
ejecta fingers behind the shock-front, a... | astro-ph_HE |
Bose-Einstein condensate stars in combined Rastall-Rainbow gravity: We study zero and finite temperature static Bose-Einstein condensate (BEC)
stars in the combined Rastall-Rainbow (RR) theory of gravity by considering
different BEC equation of states (EoSs). We obtain the global properties of BEC
stars by solving the ... | astro-ph_HE |
Spectral and polarimetric signatures of X-ray eclipses in AGN: X-ray observations of active galactic nuclei (AGN) show variability on
timescales ranging from a few hours up to a few days. Some of this variability
may be associated with occultation events by clouds in the broad line region.
In this work, we aim to model... | astro-ph_HE |
Too small to fail: characterizing sub-solar mass black hole mergers with
gravitational waves: The detection of a sub-solar mass black hole could yield dramatic new
insights into the nature of dark matter and early-Universe physics, as such
objects lack a traditional astrophysical formation mechanism. Gravitational
wa... | astro-ph_HE |
A Model of White Dwarf Pulsar AR Scorpii: A 3.56-hour white dwarf (WD) - M dwarf (MD) close binary system, AR Scorpii,
was recently reported to show pulsating emission in radio, IR, optical, and UV,
with a 1.97-minute period, which suggests the existence of a WD with a rotation
period of 1.95 minutes. We propose a mode... | astro-ph_HE |
Detailed Analysis of Filamentary Structure in the Weibel Instability: We present results of a 2D3V kinetic Vlasov simulation of the Weibel
instability. The kinetic Vlasov simulation allows us to investigate the
velocity distribution of dilute plasmas, in which the effect of collisions
between particles is negligible, a... | astro-ph_HE |
On The Evolution of The Radio Pulsar PSR J1734-3333: Recent measurements showed that the period derivative of the 'high-B' radio
pulsar PSR J1734-3333 is increasing with time. For neutron stars evolving with
fallback disks, this rotational behavior is expected in certain phases of the
long-term evolution. Using the sam... | astro-ph_HE |
Stellar oscillations in Eddington-inspired Born-Infeld gravity: We consider the stellar oscillations of relativistic stars in the
Eddington-inspired Born-Infeld gravity (EiBI). In order to examine the specific
frequencies, we derive the perturbation equations governing the stellar
oscillations in EiBI by linearizing th... | astro-ph_HE |
Detections of simultaneous brightening of gamma-ray and optical
emissions of a distant blazar GB 1508+5714 at redshift 4.3: GB 1508+5714 is a high-redshift blazar ($z$ = 4.3) and a spectrally soft
$\gamma$-ray source has been detected in its direction. By analyzing 11.4-yr
{\it Fermi}-LAT data, significant long-term ... | astro-ph_HE |
Tests of Lorentz Invariance Violation with Gamma Rays to probe Quantum
Gravity: We discuss the prospects of doing tests of Lorentz invariance with gamma-rays
observed with present and future ground based gamma-ray observatories. | astro-ph_HE |
Probing the origin of cosmic rays in Cygnus Cocoon using
ultrahigh-energy gamma-ray and neutrino observations: Recent ultrahigh energy gamma-ray observations by the HAWC up to 100 TeV and
LHAASO observatories up to 1.4 PeV energies from the direction of Fermi-LAT
4FGL source 4FGL J2028.6+4110e (Cygnus Cocoon), are in... | astro-ph_HE |
Understanding the cosmic ray positron flux: Recent precision measurements of the flux of cosmic ray positrons by the
Alpha Magnetic Spectrometer show that the spectrum has a marked softening
feature for energies close to one TeV. A possible interpretation of this result
is that the observed feature measures the maximum... | astro-ph_HE |
X-ray and Optical Study of Low Core Density Globular Clusters NGC6144
and E3: We report on the Chandra X-ray Observatory and Hubble Space Telescope
observation of two low core density globular clusters, NGC6144 and E3. By
comparing the number of X-ray sources inside the half-mass radius to those
outside, we found 6 X... | astro-ph_HE |
SN 2010jl: Optical to hard X-ray observations reveal an explosion
embedded in a ten solar mass cocoon: (Abridged) Some supernovae (SNe) may be powered by the interaction of the SN
ejecta with a large amount of circumstellar matter (CSM). Here we outline a
method to measure the mass of the optically thick CSM around s... | astro-ph_HE |
Hadronic vs leptonic models for $γ$-ray emission from VER J2227+608: Recent observations of VER J2227+608 reveal a broken power $\gamma$-ray
spectrum with the spectral index increasing from $\sim 1.8$ in the GeV energy
range to $\sim 2.3$ in the TeV range. Such a spectral break can be attributed
to radiative energy los... | astro-ph_HE |
Glitches detected in southern radio pulsars: Parkes pulse arrival-time data for 165 radio pulsars spanning from 1990 to
2011 have been searched for period glitches. Forty-six events out of the
detected 107 glitches were found to be new contributions to the entire glitch
population which currently contains approximately... | astro-ph_HE |
Unwrapping the X-ray Spectra of Active Galactic Nuclei: Active galactic nuclei (AGN) are complex phenomena. At the heart of an AGN is
a relativistic accretion disk around a spinning supermassive black hole (SMBH)
with an X-ray emitting corona and, sometimes, a relativistic jet. On larger
scales, the outer accretion dis... | astro-ph_HE |
Theoretically motivated search and detection of non-thermal pulsations
from PSRs J1747-2958, J2021+3651, and J1826-1256: Based on a theoretical selection of pulsars as candidates for detection at
X-ray energies, we present an analysis of archival X-ray observations done with
Chandra and XMM-Newton of PSR J1747-2958 (... | astro-ph_HE |
Diffuse PeV neutrinos from EeV cosmic ray sources: semi-relativistic
hypernova remnants in star-forming galaxies: We argue that the excess of sub-PeV/PeV neutrinos recently reported by
IceCube could plausibly originate through pion-production processes in the same
sources responsible for cosmic rays (CRs) with energy... | astro-ph_HE |
Signatures of Hierarchical Mergers in Black Hole Spin and Mass
distribution: Recent gravitational wave (GW) observations by LIGO/Virgo show evidence for
hierarchical mergers, where the merging BHs are the remnants of previous BH
merger events. These events may carry important clues about the astrophysical
host enviro... | astro-ph_HE |
Accelerated binary black holes in globular clusters: forecasts and
detectability in the era of space-based gravitational-wave detectors: The motion of the center of mass of a coalescing binary black hole (BBH) in a
gravitational potential imprints a line-of-sight acceleration (LOSA) onto the
emitted gravitational wav... | astro-ph_HE |
Interpreting the large amplitude X-ray variation of GRS 1915+105 and IGR
J17091-3624 as modulations of an accretion disc: Using the flux resolved spectroscopy for the first time, we analyse the
RXTE/PCA data of the black hole X-ray binaries GRS 1915+105 and IGR
J17091-3624, when both sources show large amplitude, qua... | astro-ph_HE |
Neutron star dynamics under time dependent external torques: The two component model describes neutron star dynamics incorporating the
response of the superfluid interior. Conventional solutions and applications
involve constant external torques, as appropriate for radio pulsars on
dynamical timescales. We present the ... | astro-ph_HE |
Supermassive Black Hole Winds in X-rays -- SUBWAYS. I. Ultra-fast
outflows in QSOs beyond the local Universe: We present a new X-ray spectroscopic study of $22$ luminous
($2\times10^{45}\lesssim L_{\rm bol}\rm /erg\,s^{-1} \lesssim 2\times10^{46}$)
active galactic nuclei (AGNs) at intermediate-redshift ($0.1 \lesssim... | astro-ph_HE |
Effects of a non-universal IMF and binary parameter correlations on
compact binary mergers: Binary population synthesis provides a direct way of studying the effects of
different choices of binary evolution models and initial parameter
distributions on present-day binary compact merger populations, which can then
be ... | astro-ph_HE |
The link between broad emission line fluctuations and non-thermal
emission from the inner AGN jet: AGN reverberate when the broad emission lines respond to changes of the
ionizing thermal continuum emission. Reverberation measurements have been
commonly used to estimate the size of the broad-line region (BLR) and the... | astro-ph_HE |
Dark matter annihilation and jet quenching phenomena in the early
universe: Dark-matter particles like neutralinos should decouple from the hot cosmic
plasma at temperatures of about 40 GeV. Later they can annihilate each other
into standard-model particles, which are injected into the dense primordial
plasma and qui... | astro-ph_HE |
Radiation Pressure and Mass Ejection in Rho-like States of GRS 1915+105: We present a unifying scenario to address the physical origin of the
diversity of X-ray lightcurves within the rho variability class of the
microquasar GRS 1915+105. This 'heartbeat' state is characterized by a bright
flare that recurs every ~50-1... | astro-ph_HE |
Radioactive heating rate of r-process elements and macronova light curve: We study the heating rate of r-process nuclei and thermalization of decay
products in neutron star merger ejecta and macronova (kilonova) light curves.
Thermalization of charged decay products, i.e., electrons, $\alpha$-particles,
and fission fra... | astro-ph_HE |
Search for Individual Ultrahigh Energy Cosmic Ray Sources in the Future
Data: We propose a new way to detect individual bright Ultra-High Energy Cosmic Ray
(UHECR) sources above background if the Galactic Magnetic Field (GMF) gives the
main contribution to UHECR deflections. This method can be directly applied to
map... | astro-ph_HE |
On the equivalent width of the Fe K$α$ line produced by a dusty
absorber in active galactic nuclei: Obscured AGNs provide an opportunity to study the material surrounding the
central engine. Geometric and physical constraints on the absorber can be
deduced from the reprocessed AGN emission. In particular, the obscuri... | astro-ph_HE |
ALMA CO Observations of the Gamma-Ray Supernova Remnant RX J1713.7-3946:
Discovery of Shocked Molecular Cloudlets and Filaments at 0.01 pc scales: RX J1713.7-3946 is a unique core-collapse SNR that emits bright TeV
gamma-rays and synchrotron X-rays caused by cosmic rays, in addition to
interactions with interstellar ... | astro-ph_HE |
Correlated variability of the reflection fraction with the X-ray flux
and spectral index for Mkn 478: The X-ray spectrum of Mkn 478 is known to be dominated by a strong soft
excess which can be described using relativistic blurred reflection. Using
observations from {\it XMM-Newton}, {\it AstroSat} and {\it Swift}, w... | astro-ph_HE |
Fermi LAT Measurements of the Diffuse Gamma-Ray Emission at Intermediate
Galactic Latitudes: The diffuse Galactic gamma-ray emission is produced by cosmic rays (CRs)
interacting with the interstellar gas and radiation field. Measurements by the
Energetic Gamma-Ray Experiment Telescope (EGRET) instrument on the Compto... | astro-ph_HE |
Effects of shock and turbulence properties on electron acceleration: Using test particle simulations we study electron acceleration at
collisionless shocks with a two-component model turbulent magnetic field with
slab component including dissipation range. We investigate the importance of
shock normal angle $\theta_{Bn... | astro-ph_HE |
TESS Shines Light on the Origin of the Ambiguous Nuclear Transient
ASASSN-18el: We analyze high-cadence data from the Transiting Exoplanet Survey Satellite
(TESS) of the ambiguous nuclear transient (ANT) ASASSN-18el. The optical
changing-look phenomenon in ASASSN-18el has been argued to be due to either a
drastic cha... | astro-ph_HE |
Log-normal flux distribution of bright Fermi blazars: We present the results of the $\gamma$-ray flux distribution study on the
brightest blazars which are observed by the \emph{Fermi}-LAT. We selected 50
brightest blazars based on the maximum number of detection reported in the LAT
third AGN catalog. We performed stan... | astro-ph_HE |
The Role of Superluminal Electromagnetic Waves in Pulsar Wind
Termination Shocks: The dynamics of a standing shock front in a Poynting-flux dominated
relativistic flow is investigated by using a one-dimensional, relativistic,
two-fluid simulation. An upstream flow containing a circularly polarized,
sinusoidal magneti... | astro-ph_HE |
The NANOGrav 11-year Data Set: High-precision timing of 45 Millisecond
Pulsars: We present high-precision timing data over time spans of up to 11 years for
45 millisecond pulsars observed as part of the North American Nanohertz
Observatory for Gravitational Waves (NANOGrav) project, aimed at detecting and
characteriz... | astro-ph_HE |
Exploding neutron stars in close binaries: The discovery of GW signal from merging neutron stars by LIGO on 17th August
2017 was followed by a short GRB170817A discovered by FERMI and INTEGRAL 1.7
seconds after the loss of the GW signal when it just reached its maximum. Here
we present a reproduction of the first paper... | astro-ph_HE |
Characterising the rotational irregularities of the Vela pulsar from 21
yr of phase-coherent timing: Pulsars show two classes of rotational irregularities that can be used to
understand neutron-star interiors and magnetospheres: glitches and timing
noise. Here we present an analysis of the Vela pulsar spanning nearly... | astro-ph_HE |
Stability of interlinked neutron vortex and proton flux-tube arrays in a
neutron star -- III. Proton feedback: The coupled, time-dependent Gross-Pitaevskii and Ginzburg-Landau equations
are solved simultaneously in three dimensions to investigate the equilibrium
state and far-from-equilibrium, spin-down dynamics of a... | astro-ph_HE |
The drifting subpulses of PSR B0031-07 and its synchronously modulated
radio polarization: We establish that for PSR B0031-07 the orthogonal polarization modes switch
at a single pulse level synchronously with the periodic drifting subpulses seen
in total intensity. There are only four other pulsars known for which t... | astro-ph_HE |
Indirect evidence of GeV Dark Matter: Recently, an excess of GeV gamma ray near the Galactic Centre has
beenvreported. The spectrum obtained can be best fitted with the
annihilationvof $30-40$ GeV dark matter particles through $b \bar{b}$ channel.
In this letter, I show that this annihilation model can also solve the
m... | astro-ph_HE |
Relativistic Viscous Radiation Hydrodynamic Simulations of Geometrically
Thin Disks: I. Thermal and Other Instabilities: We present results from two-dimensional, general relativistic, viscous,
radiation hydrodynamic numerical simulations of Shakura-Sunyaev thin disks
accreting onto stellar mass Schwarzschild black ho... | astro-ph_HE |
Properties of strongly magnetized ultradense matter and their imprints
on magnetar pulsations: We investigate the effect of strong magnetic fields on the adiabatic radial
oscillations of hadronic stars. We describe magnetized hadronic matter within
the framework of the relativistic nonlinear Walecka model and integra... | astro-ph_HE |
A simplified view of blazars: why BL Lacertae is actually a quasar in
disguise: We put forward a scenario where blazars are classified as flat-spectrum radio
quasars, BL Lacs, low synchrotron, or high synchrotron peaked objects according
to a varying combination of Doppler boosted radiation from the jet, emission
fro... | astro-ph_HE |
From Supernova to Remnant: Tracking the Evolution of the Oldest Known
X-ray Supernovae: Core-collapse supernovae (SNe) expand into a medium created by winds from the
pre-SN progenitor. The SN explosion and resulting shock wave(s) heat up the
surrounding plasma, giving rise to thermal X-ray emission, which depends on ... | astro-ph_HE |
3 to 12 millimetre studies of dense gas towards the western rim of
supernova remnant RX J1713.7-3946: The young X-ray and gamma-ray-bright supernova remnant RXJ1713.7-3946 (SNR
G347.3-0.5) is believed to be associated with molecular cores that lie within
regions of the most intense TeV emission. Using the Mopra teles... | astro-ph_HE |
On the Origin of Diffuse Radio Emission in Abell 85 -- Insights from new
GMRT Observations: Extended, steep, and ultra-steep spectrum radio emission in a galaxy cluster
is usually associated with recent mergers. Simulations show that radio
phoenixes are aged radio galaxy lobes whose emission reactivates when a low
Ma... | astro-ph_HE |
Supernova Explosions inside Carbon-Oxygen Circumstellar Shells: Motivated by a recent discovery of Supernova 2010gx and numerical results of
Fryer et al.(2010), we simulate light curves for several type I supernova
models, enshrouded by dense circumstellar shells, or "super-wind", rich in
carbon and oxygen and having n... | astro-ph_HE |
The time-dependent one-zone hadronic model - First principles: We present a time-dependent approach to the one-zone hadronic model in the
case where the photon spectrum is produced by ultrarelativistic protons
interacting with soft photons that are produced from protons and low magnetic
fields. Assuming that protons ar... | astro-ph_HE |
A generic method to constrain the dark matter model parameters from
Fermi observations of dwarf spheroids: Observation of gamma-rays from dwarf galaxies is an effective way to search
for particle dark matter. Using 4-year data of Fermi-LAT observations on a
series of Milky Way satellites, we develop a general way to ... | astro-ph_HE |
The spin and orbit of the newly discovered pulsar IGR J17480-2446: We present an analysis of the spin and orbital properties of the newly
discovered accreting pulsar IGR J17480-2446, located in the globular cluster
Terzan 5. Considering the pulses detected by the Rossi X-ray Timing Explorer at
a period of 90.539645(2) ... | astro-ph_HE |
TeV gamma-ray survey of the Northern sky using the ARGO-YBJ detector: The ARGO-YBJ detector is an extensive air shower array that has been used to
monitor the northern $\gamma$-ray sky at energies above 0.3 TeV from 2007
November to 2013 January. In this paper, we present the results of a sky survey
in the declination ... | astro-ph_HE |
Suzaku Discovery of a Slowly Varying Hard X-ray Continuum from the Type
I Seyfert Galaxy NGC 3516: The bright type I Seyfert galaxy NGC 3516 was observed by {\it Suzaku} twice,
in 2005 October 12--15 and 2009 October 28--November 2, for a gross time
coverage of 242 and 544 ksec and a net exposure of 134 and 255 ksec,... | astro-ph_HE |
Full Monte-Carlo description of the Moscow State University Extensive
Air Shower experiment: The Moscow State University Extensive Air Shower (EAS-MSU) array studied
high-energy cosmic rays with primary energies ~(1-500) PeV in the Northern
hemisphere. The EAS-MSU data are being revisited following recently found
ind... | astro-ph_HE |
Cosmic-ray acceleration and escape from post-adiabatic Supernova
remnants: Supernova remnants are known to accelerate cosmic rays on account of their
non-thermal emission of radio waves, X-rays, and gamma rays. Although there are
many models for the acceleration of cosmic rays in Supernova remnants, the
escape of cos... | astro-ph_HE |
Cosmic ray driven Galactic winds: The escape of cosmic rays from the Galaxy leads to a gradient in the cosmic
ray pressure that acts as a force on the background plasma, in the direction
opposite to the gravitational pull. If this force is large enough to win
against gravity, a wind can be launched that removes gas fro... | astro-ph_HE |
Environmental dependence of Type IIn supernova properties: Type IIn supernovae occur when stellar explosions are surrounded by dense
hydrogen-rich circumstellar matter. The dense circumstellar matter is likely
formed by extreme mass loss from their progenitors shortly before they explode.
The nature of Type IIn superno... | astro-ph_HE |
X-Ray Emission from the Galactic Supernova Remnant G12.0-0.1: We present results of the Suzaku/XIS observation around the radio supernova
remnant (SNR) G12.0-0.1. No significant diffuse emission extending in or along
the radio shell was observed. Instead two compact X-ray sources, Suzaku
J181205-1835 and Suzaku J181210... | astro-ph_HE |
GRBs on probation: testing the UHE CR paradigm with IceCube: Gamma ray burst (GRB) fireballs provide one of very few astrophysical
environments where one can contemplate the acceleration of cosmic rays to
energies that exceed 10^20 eV. The assumption that GRBs are the sources of the
observed cosmic rays generates a cal... | astro-ph_HE |
An up-scattered cocoon emission model of Gamma-Ray Burst high-energy
lags: The Fermi Gamma-ray Space Telescope recently detected the most energetic
gamma-ray burst so far, GRB 080916C, and reported its detailed temporal
properties in an extremely broad spectral range: (i) the time-resolved spectra
are well described ... | astro-ph_HE |
Extragalactic cosmic ray sources with very small contribution in the
particle flux on the Earth and their study: Possible existence of extragalactic ultra-high energy cosmic ray sources
giving a very small particle flux on the Earth is considered. Accretion discs
around supermassive black holes where particles are ac... | astro-ph_HE |
Strong late-time circumstellar interaction in the peculiar supernova
iPTF14hls: We present a moderate-resolution spectrum of the peculiar Type II supernova
iPTF14hls taken on day 1153 after discovery. This spectrum reveals the clear
signature of shock interaction with dense circumstellar material (CSM). We
suggest th... | astro-ph_HE |
The origin of the first neutron star -- neutron star merger: The first neutron star-neutron star (NS-NS) merger was discovered on August
17, 2017 through gravitational waves (GW170817) and followed with
electromagnetic observations. This merger was detected in an old elliptical
galaxy with no recent star formation. We ... | astro-ph_HE |
Characteristics of the diffuse astrophysical electron and tau neutrino
flux with six years of IceCube high energy cascade data: We report on the first measurement of the astrophysical neutrino flux using
particle showers (cascades) in IceCube data from 2010 -- 2015. Assuming
standard oscillations, the astrophysical n... | astro-ph_HE |
Modeling Magnetic Disk-Wind State Transitions in Black Hole X-ray
Binaries: We analyze three prototypical black hole (BH) X-ray binaries (XRBs), \4u1630,
\gro1655\ and \h1743, in an effort to systematically understand the intrinsic
state transition of the observed accretion-disk winds between \windon\ and
\windoff\ s... | astro-ph_HE |
Calculating transient rates from surveys: We have developed a method to determine the transient surface density and
transient rate for any given survey, using Monte-Carlo simulations. This method
allows us to determine the transient rate as a function of both the flux and
the duration of the transients in the whole flu... | astro-ph_HE |
A search for lines in the bright X-ray afterglow of GRB120711A: GRB120711A, discovered and rapidly localized by the INTEGRAL satellite,
attracted particular interest due to its high gamma-ray fluence, very bright
X-ray afterglow, and the detection of a prompt optical transient and of
long-lasting emission at GeV energi... | astro-ph_HE |
Long duration radio transients lacking optical counterparts are possibly
Galactic Neutron Stars: (abridged) Recently, a new class of radio transients in the 5-GHz band was
detected by Bower et al. We present new deep near-Infrared (IR) observations of
the field containing these transients, and find no counterparts do... | astro-ph_HE |
A pulsar in a binary with a compact object in the mass gap between
neutron stars and black holes: Among the compact objects observed in gravitational wave merger events a few
have masses in the gap between the most massive neutron stars (NSs) and least
massive black holes (BHs) known. Their nature and the formation o... | astro-ph_HE |
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