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Hydrodynamics of Core-Collapse Supernovae at the Transition to
Explosion. I. Spherical Symmetry: We study the transition to runaway expansion of an initially stalled
core-collapse supernova shock. The neutrino luminosity, mass accretion rate,
and neutrinospheric radius are all treated as free parameters. In spherical... | astro-ph_HE |
Constraining the lensing of binary neutron stars from their stochastic
background: Gravitational wave (GW) transients from binary neutron star (BNS)
coalescences can, in principle, be subject to gravitational lensing thereby
increasing the amplitude and signal-to-noise ratio. We estimate the rate of
lensed BNS events... | astro-ph_HE |
Inferences from the Distributions of Fast Radio Burst Pulse Widths,
Dispersion Measures and Fluences: The widths, dispersion measures, dispersion indices and fluences of Fast
Radio Bursts (FRB) impose coupled constraints that all models must satisfy.
Observation of dispersion indices close to their low density limit ... | astro-ph_HE |
Electromagnetic Window into the Dawn of Black Holes: Massive 10^6-10^10 Msun black holes (BHs) are ubiquitous in local galactic
nuclei. They were common by the time the Universe is several Gyr old, and many
of them were in place within the first 1~Gyr after the Big Bang. Their quick
assembly has been attributed to mech... | astro-ph_HE |
Dynamical Formation Scenarios for GW190521 and Prospects for Decihertz
Gravitational-Wave Astronomy with GW190521-Like Binaries: The gravitational-wave (GW) detection of GW190521 has provided new insights
on the mass distribution of black holes and new constraints for astrophysical
formation channels. With independen... | astro-ph_HE |
Evidence for GeV Pair Halos around Low Redshift Blazars: We report on the results of a search for $\gamma$-ray pair halos with a
stacking analysis of low-redshift blazars using data from the Fermi Large Area
Telescope. For this analysis we used a number of a-priori selection criteria,
including the spatial and spectral... | astro-ph_HE |
The XMM-Newton survey of the Small Magellanic Cloud:
XMMUJ010633.1-731543 and XMMUJ010743.1-715953, two new Be/X-ray binary
systems: In the course of the XMM-Newton survey of the Small Magellanic Cloud (SMC),
two new bright X-ray sources were discovered exhibiting the spectral
characteris- tics of High Mass X-ray B... | astro-ph_HE |
Lorentz Violation: Motivation and new constraints: We review the main theoretical motivations and observational constraints on
Planck scale suppressed violations of Lorentz invariance. After introducing the
problems related to the phenomenological study of quantum gravitational
effects, we discuss the main theoretical ... | astro-ph_HE |
Investigating evidence for different black hole accretion modes since
redshift z~1: Chandra data in the COSMOS, AEGIS-XD and 4Ms CDFS are combined with
optical/near-IR photometry to determine the rest-frame U-V vs V-J colours of
X-ray AGN hosts at mean redshifts 0.40 and 0.85. This combination of colours
(UVJ) provid... | astro-ph_HE |
Can very massive Population III stars produce a super-collapsar?: A fraction of the first generation of stars in the early Universe may be very
massive ($\gtrsim 300~\mathrm{M_\odot}$) as they form in metal-free
environments. Formation of black holes from these stars can be accompanied by
supermassive collapsars to pro... | astro-ph_HE |
Observation of Anisotropy in the Arrival Direction Distribution of TeV
Cosmic Rays with HAWC: The High-Altitude Water Cherenkov (HAWC) Observatory, located 4100 m above
sea level near Sierra Negra (19$^\circ$ N) in Mexico, is sensitive to gamma
rays and cosmic rays at TeV energies. The arrival direction distribution ... | astro-ph_HE |
A systematic study of photoionized emission and warm absorption
signatures of the NLS1 Mrk 335: We present an analysis of all the archival high resolution spectra of the
Narrow-line Seyfert 1 galaxy Mrk~335 obtained with Reflection Grating
Spectrometer (RGS) on board \textit{XMM-Newton}. The spectra show rich emissio... | astro-ph_HE |
Growing evidence that SNe Iax are not a one-parameter family: the case
of PS1-12bwh: In this study, we present observations of a type Iax supernova, PS1-12bwh,
discovered during the Pan-STARRS1 3$\pi$-survey. Our analysis was driven by
previously unseen pre-maximum, spectroscopic heterogeneity. While the light
curve ... | astro-ph_HE |
Superorbital modulation at GeV energies in the gamma-ray binary LS I +61
303: We report the results from our analysis of 8 years of the data for the
gamma-ray binary LS I +61 303, obtained with the Large Area Telescope onboard
the Fermi Gamma-Ray Space Telescope. We find a significant dip around the
binary's periastr... | astro-ph_HE |
The Einstein@Home Gamma-ray Pulsar Survey. I. Search Methods,
Sensitivity and Discovery of New Young Gamma-ray Pulsars: We report on the results of a recent blind search survey for gamma-ray
pulsars in Fermi Large Area Telescope (LAT) data being carried out on the
distributed volunteer computing system, Einstein@Home... | astro-ph_HE |
A tale of two mergers: constraints on kilonova detection in two short
GRBs at z$\sim$0.5: We present a detailed multi-wavelength analysis of two short Gamma-Ray Bursts
(sGRBs) detected by the Neil Gehrels Swift Observatory: GRB 160624A at
$z=0.483$ and GRB 200522A at $z=0.554$. These sGRBs demonstrate very different
... | astro-ph_HE |
Variety of disk wind-driven explosions in massive rotating stars: We perform a set of two-dimensional, non-relativistic, hydrodynamics
simulations for supernova-like explosion associated with stellar core collapse
of rotating massive stars to a system of a black hole and a disk connected by
the transfer of matter and a... | astro-ph_HE |
The Spectral Sharpness Angle of Gamma-ray Bursts: We explain the results of Yu et al. (2015b) of the novel sharpness angle
measurement to a large number of spectra obtained from the Fermi gamma-ray
burst monitor. The sharpness angle is compared to the values obtained from
various representative emission models: blackbo... | astro-ph_HE |
r-Process Lanthanide Production and Heating Rates in Kilonovae: r-Process nucleosynthesis in material ejected during neutron star mergers may
lead to radioactively powered transients called kilonovae. The timescale and
peak luminosity of these transients depend on the composition of the ejecta,
which determines the loc... | astro-ph_HE |
Sub-arcsecond radio and optical observations of the likely counterpart
to the gamma-ray source 2FGL J2056.7+4939: We have searched and reviewed all multi- wavelength data available for the
region towards the gamma-ray source 2FGL J2056.7+4939 in order to con- strain
its possible counterpart at lower energies. As a re... | astro-ph_HE |
Investigating the true nature of three hard X-ray sources: Many of the new high energy sources discovered both by INTEGRAL/IBIS and
Swift/BAT have been characterised thanks to extensive, multi-band follow-up
campaigns, but there are still objects whose nature remains to be asserted. In
this paper we investigate the tru... | astro-ph_HE |
Exploring properties of high-density matter through remnants of
neutron-star mergers: Remnants of neutron-star mergers are essentially massive, hot, differentially
rotating neutron stars, which are initially strongly oscillating. They
represent a unique probe for high-density matter because the oscillations are
detec... | astro-ph_HE |
Intrinsic disc emission and the Soft X-ray Excess in AGN: (Abridged) Narrow Line Seyfert 1 (NLS1) galaxies have low mass black holes
and mass accretion rates close to (or exceeding) Eddington, so a standard
blackbody accretion disc should peak in the EUV. However, the lack of true
absorption opacity in the disc means t... | astro-ph_HE |
Magnetic-distortion-induced ellipticity and gravitational wave radiation
of neutron stars: millisecond magnetars in short GRBs, Galactic pulsars, and
magnetars: Neutron stars may sustain a non-axisymmetric deformation due to magnetic
distortion and are potential sources of continuous gravitational waves (GWs)
for g... | astro-ph_HE |
Implications on the origin of cosmic rays in light of 10 TV spectral
softenings: Precise measurements of the energy spectra of cosmic rays (CRs) show various
kinds of features deviating from single power-laws, which give very interesting
and important implications on their origin and propagation. Previous
measurement... | astro-ph_HE |
Maximum mass of a hybrid star having a mixed phase region in the light
of pulsar PSR J1614-2230: Recent observation of pulsar PSR J1614-2230 with mass about 2 solar masses
poses a severe constraint on the equations of state (EOS) of matter describing
stars under extreme conditions. Neutron stars (NS) can reach the ma... | astro-ph_HE |
Mass and radius relations of quarkyonic stars using an excluded volume
model: Inspired by the excluded volume model for isospin symmetric quarkyonic
matter, we construct an `excluded volume' model for a charge neutral quarkyonic
phase whose hadronic sector contains only neutrons. We refer to this model as
quarkyonic ... | astro-ph_HE |
Stellar and AGN feedback in isolated early-type galaxies: the role in
regulating star formation and ISM properties: Understanding how galaxies maintain the inefficiency of star formation with
physically self-consistent models is a central problem for galaxy evolution.
Although numerous theoretical models have been pr... | astro-ph_HE |
The polarized Gamma-Ray Burst GRB 061122: We report on the polarization measure, obtained with IBIS on board INTEGRAL,
of the prompt emission of GRB 061122. Over an 8 s interval containing the
brightest part of the Gamma-Ray Burst we put a lower limit on its polarization
fraction of 60% at 68% c.l. and of 33% at 90% c.... | astro-ph_HE |
Assessing the Observability of Hypernovae and Pair-Instability
Supernovae in the Early Universe: The era of the universe's first (Population III) stars is essentially
unconstrained by observation. Ultra-luminous and massive stars from this time
altered the chemistry of the cosmos, provided the radiative scaffolding t... | astro-ph_HE |
Binary Black Hole Accretion From a Circumbinary Disk: Gas Dynamics
Inside the Central Cavity: We present the results of 2D hydrodynamical simulations of circumbinary disk
accretion using the finite-volume code DISCO. This code solves the 2D viscous
Navier-Stokes equations on a high-resolution moving mesh which shears... | astro-ph_HE |
Nucleosynthesis in magnetorotational supernovae: impact of the magnetic
field configuration: The production of heavy elements is one of the main by-products of the
explosive end of massive stars. A long sought goal is finding differentiated
patterns in the nucleosynthesis yields, which could permit identifying a numb... | astro-ph_HE |
ThunderKAT: The MeerKAT Large Survey Project for Image-Plane Radio
Transients: ThunderKAT is the image-plane transients programme for MeerKAT. The goal as
outlined in 2010, and still today, is to find, identify and understand
high-energy astrophysical processes via their radio emission (often in concert
with observat... | astro-ph_HE |
The Luminosity Distribution of Short Gamma-Ray Bursts under a Structured
Jet Scenario: Luminosity of GRB 170817A is much lower than that of other sGRBs. The
measurement of the superluminal movement of the radio afterglow emission
confirms the presence of the relativistic jet, and the emission features can be
well exp... | astro-ph_HE |
Multi-waveform cross-correlation search method for intermediate-duration
gravitational waves from gamma-ray bursts: Gamma-ray Bursts (GRBs) are flashes of gamma-rays thought to originate from
rare forms of massive star collapse (long GRBs), or from mergers of compact
binaries (short GRBs) containing at least one neut... | astro-ph_HE |
Enhanced X-ray emission from Lyman Break Analogues and a Possible
$L_{\rm X}$--SFR--Metallicity Plane: The source of energetic photons that heated and reionized the early Universe
remains uncertain. Early galaxies had low metallicity and recent population
synthesis calculations suggest that the number and luminosity ... | astro-ph_HE |
Detectability of Sub-Solar Mass Neutron Stars Through a Template Bank
Search: We study the detectability of gravitational-wave signals from sub-solar mass
binary neutron star systems by the current generation of ground-based
gravitational-wave detectors. We find that finite size effects from large tidal
deformabiliti... | astro-ph_HE |
The long-term optical evolution of the black hole candidate MAXI
J1659-152: We present 5 years of optical and infrared data of the black hole candidate
MAXI J1659-152 covering its 2010 outburst, decay and quiescence. Combining
optical data taken during the outburst decay, we obtain an orbital period of
2.414 $\pm$ 0.... | astro-ph_HE |
Glitches: the exact quantum signatures of pulsars metamorphosis: The observed recurrence of glitches in pulsars and neutron stars carry rich
information about the evolution of their internal structures. In this article I
show that the glitch-events observed in pulsars are exact quantum signatures
for their metamorphosi... | astro-ph_HE |
Quantifying How Density Gradients and Front Curvature Affect Carbon
Detonation Strength During Type Ia Supernovae: Accurately reproducing the physics behind the detonations of Type Ia
supernovae and the resultant nucleosynthetic yields is important for
interpreting observations of spectra and remnants. The scales of ... | astro-ph_HE |
Using machine learning for transient classification in searches for
gravitational-wave counterparts: The large sky localization regions offered by the gravitational-wave
interferometers require efficient follow-up of the many counterpart candidates
identified by the wide field-of-view telescopes. Given the restricted... | astro-ph_HE |
Search for gravitational waves associated with gamma-ray bursts during
LIGO science run 6 and Virgo science runs 2 and 3: We present the results of a search for gravitational waves associated with
154 gamma-ray bursts (GRBs) that were detected by satellite-based gamma-ray
experiments in 2009-2010, during the sixth LI... | astro-ph_HE |
A New Spin on an Old Black Hole: NuSTAR Spectroscopy of EXO 1846-031: The black hole candidate EXO 1846-031 underwent an outburst in 2019, after at
least 25 years in quiescence. We observed the system using \textit{NuSTAR} on
August 3rd, 2019. The 3--79 keV spectrum shows strong relativistic reflection
features. Our ba... | astro-ph_HE |
Jet Suppression by Accretion Disk Winds in the Microquasar GRS 1915+105: Stellar-mass black holes with relativistic jets, also known as microquasars,
mimic the behavior of quasars and active galactic nuclei. Because timescales
around stellar-mass black holes are orders of magnitude smaller than those
around more distan... | astro-ph_HE |
Supergiant Fast X-ray Transients with Swift: spectroscopic and temporal
properties: Supergiant fast X-ray transients (SFXTs) are a class of high-mass X-ray
binaries with possible counterparts in the high energy gamma rays. The Swift
SFXT Project has conducted a systematic investigation of the properties of
SFTXs on t... | astro-ph_HE |
Improved early warning of compact binary mergers using higher modes of
gravitational radiation: A population study: A gravitational-wave (GW) early-warning of a compact-binary coalescence
event, with a sufficiently tight localisation skymap, would allow telescopes to
point in the direction of the potential electromag... | astro-ph_HE |
DW Cancri in x-rays: We report on the $XMM$-Newton observation of DW Cnc, a candidate intermediate
polar candidate whose historical optical light curve shows the existence of
periods at $\simeq 38$, $\simeq 86$ and $\simeq 69$ minutes which were
interpreted as the white dwarf spin, the orbital and the spin-orbit beat
p... | astro-ph_HE |
Evidence for crust cooling in the transiently accreting 11-Hz X-ray
pulsar in the globular cluster Terzan 5: The temporal heating and subsequent cooling of the crusts of transiently
accreting neutron stars carries unique information about their structure and a
variety of nuclear reaction processes. We report on a new... | astro-ph_HE |
Extreme Variability in a Long Duration Gamma-ray Burst Associated with a
Kilonova: The recent discovery of a kilonova from the long duration gamma-ray burst,
GRB 211211A, challenges classification schemes based on temporal information
alone. Gamma-ray properties of GRB 211211A reveal an extreme event, which
stands ou... | astro-ph_HE |
Correlations between radio and bolometric fluxes in GX 339-4 and
H1743-322: Compact radio jets are ubiquitous in stellar-mass black-hole binaries in
their hard spectral state. Empirical relations between the radio and
narrow-band X-ray fluxes have been used to understand the connection between
their accretion discs a... | astro-ph_HE |
Constraints on Blazar Jet Conditions During Gamma-Ray Flaring from
Radiative Transfer Modeling: As part of a program to investigate jet flow conditions during GeV gamma-ray
flares detected by Fermi, we are using UMRAO multi-frequency, centimeter-band
total flux density and linear polarization monitoring observations ... | astro-ph_HE |
X-Ray Luminous Binaries, Metallicity, and the Early Universe: High mass X-ray binaries (HMXBs) may have had a significant impact on the
heating of the intergalactic medium in the early universe. Study of HMXBs in
nearby, low metallicity galaxies that are local analogues to early galaxies can
help us understand early HM... | astro-ph_HE |
New unidentified H.E.S.S. Galactic sources: H.E.S.S. is one of the most sensitive instruments in the very high energy
(VHE; > 100 GeV) gamma-ray domain and has revealed many new sources along the
Galactic Plane. After the successful first VHE Galactic Plane Survey of 2004,
H.E.S.S. has continued and extended that surve... | astro-ph_HE |
Modeling pulsar time noise with long term power law decay modulated by
short term oscillations of the magnetic fields of neutron stars: We model the evolution of the magnetic fields of neutron stars as consisting
of a long term power-law decay modulated by short term small amplitude
oscillations. Our model prediction... | astro-ph_HE |
On the Tidal Capture of White Dwarfs by Intermediate-mass Black Holes in
Dense Stellar Environments: Intermediate-mass black holes (IMBHs) are the missing link between
stellar-mass and supermassive black holes, widely believed to reside in at
least some dense star clusters, but not yet observed directly. Tidal
disrup... | astro-ph_HE |
Radio Evolution of Supernova Remnants Including Non-linear Particle
Acceleration: Insights from Hydrodynamic Simulations: We present a model for the radio evolution of supernova remnants (SNRs)
obtained by using three-dimensional (3D) hydrodynamic simulations, coupled with
nonlinear kinetic theory of cosmic ray (CR) ... | astro-ph_HE |
Collective excitations in neutron-star crusts: We explore the spectrum of low-energy collective excitations in the crust of
a neutron star, especially in the inner region where neutron-proton clusters
are immersed in a sea of superfluid neutrons. The speeds of the different modes
are calculated systematically from the ... | astro-ph_HE |
Meeting the Challenge from Bright and Fast Gamma-Ray Flares of 3C 279: Bright and fast gamma-ray flares with hard spectra have been recently
detected from the blazar 3C 279, with apparent GeV luminosities up to $10^{49}$
erg/s. The source is observed to flicker on timescales of minutes with no
comparable optical-UV cou... | astro-ph_HE |
A report on the type II X-ray burst from SMC X-1: We study RXTE PCA data for the high mass X-ray binary source SMC X-1 between
2003-10 and 2003-12 when the source was in high states. The source is found to
be frequently bursting which can be seen as flares in lightcurves on an average
of one in every 800 s, with an ave... | astro-ph_HE |
Optical Spectral Variations of a Large Sample of Fermi Blazars: We have investigated the optical spectral behavior of a large sample of Fermi
blazars (40 FSRQs and 13 BL Lacs), and found two new universal optical spectral
behaviors. In the low state the optical spectrum gradually becomes softer
(steeper) or harder (fla... | astro-ph_HE |
Radio surface fluctuations in radio relics: Recent observations have revealed detailed structures of radio relics in a
wide range of frequencies. In this work, we perform three-dimensional
magnetohydrodynamical simulations of merger shocks propagating through a
turbulent magnetized intracluster medium, and employ on-th... | astro-ph_HE |
Cosmic-ray electron transport in the galaxy M 51: Context. Indirect observations of the cosmic-ray electron (CRE) distribution
via synchrotron emission is crucial for deepening the understanding of the CRE
transport in the interstellar medium, and in investigating the role of galactic
outflows.
Aims. In this paper, w... | astro-ph_HE |
When and where did GW150914 form?: The recent LIGO detection of gravitational waves (GW150914), likely
originating from the merger of two $\sim 30 M_\odot$ black holes suggests
progenitor stars of low metallicity ($[Z/Z_\odot] \lesssim 0.3$), constraining
when and where the progenitor of GW150914 may have formed. We co... | astro-ph_HE |
Thermal synchrotron radiation from RRMHD simulations of the double
tearing mode reconnection - Application to the Crab flares: We study the magneto-hydrodynamic tearing instability occurring in a double
current sheet configuration when a guide field is present. This is investigated
by means of resistive relativistic ... | astro-ph_HE |
Gamma Rays From Blazars: Blazars are high-energy engines providing us natural laboratories to study
particle acceleration, relativistic plasma processes, magnetic field dynamics,
black hole physics. Key informations are provided by observations at
high-energy (in particular by Fermi/LAT) and very-high energy (by Cheren... | astro-ph_HE |
Effects of nuclear matter and composition in core-collapse supernovae
and long-term proto-neutron star cooling: We study the influence of hot and dense matter in core-collapse supernovae by
adopting up-to-date nuclear equation of state (EOS) based on the microscopic
nuclear many-body frameworks. We explore effects of... | astro-ph_HE |
The 999th Swift gamma-ray burst: Some like it thermal: We present a multiwavelength study of GRB 151027A. This is the 999th GRB
detected by the Swift satellite and it has a densely sampled emission in the
X-ray and optical band and has been observed and detected in the radio up to
140 days after the prompt. The multiwa... | astro-ph_HE |
Time-resolved Spectral Study Of Fermi GRBs Having Single Pulses: We analyze gamma-ray bursts (GRBs) detected by \textit{Fermi}/Gamma-Ray Burst
Monitor (GBM) and having single pulse. We fit the light curves with a model
having exponential rise and decay parts. We perform a detailed time-resolved
spectroscopy using four ... | astro-ph_HE |
Deep Chandra observations of Pictor A: We report on deep Chandra observations of the nearby broad-line radio galaxy
Pictor A, which we combine with new Australia Telescope Compact Array (ATCA)
observations. The new X-ray data have a factor 4 more exposure than
observations previously presented and span a 15-year time b... | astro-ph_HE |
Observations of V404 Cygni during the 2015 outburst by the Nasu
telescope array at 1.4 GHz: Waseda University Nasu telescope array is a spatial fast Fourier transform
(FFT) interferometer consisting of eight linearly aligned antennas with 20 m
spherical dishes. This type of interferometer was developed to survey tran... | astro-ph_HE |
Merging White Dwarfs and Thermonuclear Supernovae: Thermonuclear supernovae result when interaction with a companion reignites
nuclear fusion in a carbon-oxygen white dwarf, causing a thermonuclear runaway,
a catastrophic gain in pressure, and the disintegration of the whole white
dwarf. It is usually thought that fusi... | astro-ph_HE |
Vortex Pinning in Neutron Stars, Slip-stick Dynamics, and the Origin of
Spin Glitches: We study pinning and unpinning of superfluid vortices in the inner crust of a
neutron star using 3-dimensional dynamical simulations. Strong pinning occurs
for certain lattice orientations of an idealized, body-centered cubic latti... | astro-ph_HE |
Searching for energy-resolved quasi-periodic oscillations in AGN: X-ray quasi-periodic oscillations (QPOs) in AGN allow us to probe and
understand the nature of accretion in highly curved space-time, yet the most
robust form of detection (i.e. repeat detections over multiple observations)
has been limited to a single s... | astro-ph_HE |
Searching for TeV emission from GRBs: the status of the H.E.S.S. GRB
programme: H.E.S.S. is an array of five Imaging Atmospheric Cherenkov Telescopes (IACTs)
located 1800 m above sea level in the Khomas Highland of Namibia and is
sensitive to very-high-energy (VHE) gamma rays between tens of GeV to tens of
TeV. The v... | astro-ph_HE |
EAS optical Cherenkov signatures of tau neutrinos for space and
suborbital detectors: Multi-messenger observations of transient astrophysical sources have the
potential to characterize the highest energy accelerators and the most extreme
environments in the Universe. Detection of neutrinos, in particular tau
neutrino... | astro-ph_HE |
Kink-driven magnetic reconnection in relativistic jets: consequences for
X-ray polarimetry of BL Lacs: We investigate with relativistic MHD simulations the dissipation physics of
BL Lac jets, by studying the synchrotron polarization signatures of particles
accelerated by the kink instability in a magnetically-dominat... | astro-ph_HE |
The inner knot of the Crab nebula: We model the inner knot of the Crab Nebula as a synchrotron emission coming
from the non-spherical MHD termination shock of relativistic pulsar wind. The
post-shock flow is mildly relativistic; as a result the Doppler-beaming has a
strong impact on the shock appearance. The model can ... | astro-ph_HE |
Revealing x-ray and gamma ray temporal and spectral similarities in the
GRB 190829A afterglow: Gamma-ray bursts (GRBs), which are bright flashes of gamma rays from
extragalactic sources followed by fading afterglow emission, are associated
with stellar core collapse events. We report the detection of very-high-energy... | astro-ph_HE |
Associated molecular and atomic clouds with X-ray shell of superbubble
30 Doradus C in the LMC: 30 Doradus C is a superbubble which emits the brightest nonthermal X- and TeV
gamma-rays in the Local Group. In order to explore detailed connection between
the high energy radiation and the interstellar medium, we have ca... | astro-ph_HE |
Effect of dark matter on the shadow of a distorted and deformed compact
object: This work investigates observational properties, namely the shadow and photon
ring structure, of emission profiles originated near compact objects. In
particular, we consider a distorted and deformed compact object characterized
by quadru... | astro-ph_HE |
Progenitor, environment, and modelling of the interacting transient, AT
2016jbu (Gaia16cfr): We present the bolometric lightcurve, identification and analysis of the
progenitor candidate, and preliminary modelling of AT2016jbu (Gaia16cfr). We
find a progenitor consistent with a $\sim$22--25~$M_{\odot}$ yellow hypergi... | astro-ph_HE |
Supernova Search with the AMANDA / IceCube Detectors: Since 1997 the neutrino telescope AMANDA at the geographic South Pole has
been monitoring our Galaxy for neutrino bursts from supernovae. Triggers were
introduced in 2004 to submit burst candidates to the Supernova Early Warning
System SNEWS. From 2007 the burst sea... | astro-ph_HE |
The glitches and rotational history of the highly energetic young pulsar
PSR J0537$-$6910: We present a timing and glitch analysis of the young X-ray pulsar PSR
J0537$-$6910, located within the Large Magellanic Cloud, using 13 years of data
from the now decommissioned Rossi X-ray Timing Explorer. Rotating with a spin... | astro-ph_HE |
X-ray emission of contact binary variables within 1 kpc: By assembling the largest sample to date of X-ray emitting EW-type binaries
(EWXs), we carried out correlation analyses for the X-ray luminosity
log$L_{\textrm{X}}$, and X-ray activity level
log($L_{\textrm{X}}$/$L_{\textrm{bol}}$) versus the orbital period $P$ a... | astro-ph_HE |
High Resolution X-ray Spectroscopy of the Seyfert 1, Mrk 1040. Revealing
the Failed Nuclear Wind with Chandra: High resolution X-ray spectroscopy of the warm absorber in the nearby X-ray
bright Seyfert 1 galaxy, Mrk 1040 is presented. The observations were carried
out in the 2013-2014 timeframe using the Chandra High... | astro-ph_HE |
Extremal energy shifts of radiation from a ring near a rotating black
hole: Radiation from a narrow circular ring shows a characteristic double-horn
profile dominated by photons having energy around the maximum or minimum of the
allowed range, i.e. near the extremal values of the energy shift. The energy
span of a sp... | astro-ph_HE |
Gamma-Ray and X-Ray Observations of the Periodic-Repeater FRB 180916
During Active Phases: FRB 180916 is a most intriguing source at 150 Mpc distance capable of
producing repeating fast radio bursts with a periodic 16.35 day temporal
pattern. We report on the X-ray and $\gamma$-ray observations of FRB 180916
obtained... | astro-ph_HE |
Equations of state for supernovae and compact stars: We review various theoretical approaches for the equation of state (EoS) of
dense matter, relevant for the description of core-collapse supernovae, compact
stars and compact star mergers. The emphasis is put on models that are
applicable to all of these scenarios. Su... | astro-ph_HE |
Neural Simulation-Based Inference of the Neutron Star Equation of State
directly from Telescope Spectra: Neutron stars provide a unique opportunity to study strongly interacting
matter under extreme density conditions. The intricacies of matter inside
neutron stars and their equation of state are not directly visible... | astro-ph_HE |
Cosmic-ray spectral anomaly at GeV-TeV energies as due to
re-acceleration by weak shocks in the Galaxy: Recent cosmic-ray measurements by the ATIC, CREAM and PAMELA experiments have
found an apparent hardening of the energy spectrum at TeV energies. Although
the origin of the hardening is not clearly understood, poss... | astro-ph_HE |
A radio, optical, UV and X-ray view of the enigmatic changing look
Active Galactic Nucleus 1ES~1927+654 from its pre- to post-flare states: The nearby type-II AGN 1ES1927+654 went through a violent changing-look (CL)
event beginning December 2017 during which the optical and UV fluxes increased
by four magnitudes ove... | astro-ph_HE |
Fermi Large Area Telescope observations of Local Group galaxies:
Detection of M31 and search for M33: Cosmic rays (CRs) can be studied through the galaxy-wide gamma-ray emission
that they generate when propagating in the interstellar medium. The comparison
of the diffuse signals from different systems may inform us a... | astro-ph_HE |
Variations of the physical parameters of the blazar Mrk 421 based on the
analysis of the spectral energy distributions: We report on the variations of the physical parameters of the jet observed in
the blazar Mrk 421, and discuss the origin of X-ray flares in the jet, based on
the analysis of the several spectral ene... | astro-ph_HE |
Accretion-powered pulsations in an apparently quiescent neutron star
binary: Accreting millisecond X-ray pulsars are an important subset of low-mass X-ray
binaries in which coherent X-ray pulsations can be observed during occasional,
bright outbursts (X-ray luminosity $L_X\sim 10^{36}$ erg s$^{-1}$). These
pulsations... | astro-ph_HE |
Indications of Negative Evolution for the Sources of the Highest Energy
Cosmic Rays: Using recent measurements of the spectrum and chemical composition of the
highest energy cosmic rays, we consider the sources of these particles. We find
that the data strongly prefers models in which the sources of the ultra-high
en... | astro-ph_HE |
Stellar wind accretion and accretion disk formation: applications to
neutron star high mass X-ray binaries: Recent X-ray observations have revealed the complexity and diversity of
high-mass X-ray binaries (HMXBs). This diversity challenges a classical
understanding of the accretion process onto the compact objects. I... | astro-ph_HE |
Stability of three-dimensional relativistic jets: implications for jet
collimation: The stable propagation of jets in FRII sources is remarkable if one takes
into account that large-scale jets are subjected to potentially highly
disruptive three-dimensional (3D) Kelvin-Helmholtz instabilities. Numerical
simulations c... | astro-ph_HE |
Non-parametric Bayesian reconstruction of Galactic magnetic fields using
Information Field Theory: The inclusion of line-of-sight information in
ultra-high energy cosmic ray backtracking: (abridged) Ultra-high energy cosmic rays (UHECRs) are extremely energetic
charged particles with energies surpassing $10^{18}$ e... | astro-ph_HE |
Mass of intermediate black hole in the source M82 X-1 restricted by
models of twin high-frequency quasi-periodic oscillations: We apply the relativistic precession (RP) model with its variants and the
resonance epicyclic model with its variants, based on the frequencies of the
geodesic epicyclic motion in the field o... | astro-ph_HE |
Determining the optimal locations for shock acceleration in
magnetohydrodynamical jets: Observations of relativistic jets from black holes systems suggest that
particle acceleration often occurs at fixed locations within the flow. These
sites could be associated with critical points that allow the formation of
standi... | astro-ph_HE |
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