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Phase shift of gravitational waves induced by aberration: The velocity of a gravitational wave (GW) source provides crucial information
about its formation and evolution processes. Previous studies considered the
Doppler effect on the phase of GWs as a potential signature of a time-dependent
velocity of the source. How... | astro-ph_HE |
Early Spectral Evolution of the Rapidly Expanding Type Ia SN 2006X: We present optical spectroscopic and photometric observations of Type Ia
supernova (SN) 2006X from --10 to +91 days after the $B$-band maximum. This SN
exhibits one of the highest expansion velocity ever published for SNe Ia. At
premaximum phases, the ... | astro-ph_HE |
Constraining Low-luminosity Gamma-Ray Bursts as Ultra-high-energy Cosmic
Ray Sources Using GRB 060218 as a Proxy: We study the connection between low-luminosity gamma-ray bursts (llGRBs) and
ultra-high-energy cosmic rays (UHECRs) using the canonical low-luminosity GRB
060218 as a proxy. We focus on the consequential ... | astro-ph_HE |
Megaparsec-scale Radio Structure Associated with a Hybrid Blazar SBS
B1646+499: Episodic Jet Activity with Precessing Axis: Here we report on the total-intensity 610 MHz GMRT observations of the
peculiar hybrid blazar SBS B1646+499, which merges the properties of BL
Lacertae objects and flat-spectrum radio quasars. T... | astro-ph_HE |
On the nature of the 'hostless' short GRBs: A significant proportion ($\sim30\%$) of the short-duration gamma-ray bursts
(SGRBs) localised by Swift have no detected host galaxy coincident with the
burst location to deep limits, and also no high-likelihood association with
proximate galaxies on the sky. These SGRBs may ... | astro-ph_HE |
Hints of a second explosion (a quark nova) in Cassiopeia A Supernova: We show that the explosive transition of the neutron star (NS) to a quark
star (QS) (a Quark Nova) in Cassiopeia A (Cas A) a few days following the SN
proper can account for several of the puzzling kinematic and nucleosynthetic
features observed. The... | astro-ph_HE |
A Study of the Long-term Spectral Variations of 3C 66A Observed with the
Fermi and Kanata Telescopes: 3C 66A is an intermediate-frequency-peaked BL Lac object detected by the
Large Area Telescope onboard the Fermi Gamma-ray Space Telescope.
We present a study of the long-term variations of this blazar seen over 2
y... | astro-ph_HE |
Searching for Dark Matter Annihilation in M87: Clusters of galaxies, such as the Virgo cluster, host enormous quantities of
dark matter, making them prime targets for efforts in indirect dark matter
detection via potential radiative signatures from annihilation of dark matter
particles and subsequent radiative losses o... | astro-ph_HE |
Calibrating X-ray binary luminosity functions via optical reconnaissance
II. The high-mass XLF and globular cluster population of X-ray binaries in
the low star-forming spiral M81: We characterize the optical counterparts to the compact X-ray source
population within the nearby spiral galaxy M81 using multi-band Hu... | astro-ph_HE |
Cosmic searches for Lorentz invariance violation: Cosmic messengers (gamma rays, cosmic rays, neutrinos and gravitational
waves) provide a powerful complementary way to search for Lorentz invariance
violating effects to laboratory-based experiments. The long baselines and high
energies involved make Cherenkov telescope... | astro-ph_HE |
A variable ULX and possible IMBH candidate in M51a: ULX-7, in the northern spiral arm of M51, demonstrates unusual behaviour for
an ultraluminous X-ray source, with a hard X-ray spectrum but very high
short-term variability. This suggests that it is not in a typical ultraluminous
state. We analyse the source using arch... | astro-ph_HE |
The Mergers in Abell 2256: Displaced Gas and its Connection to the
Radio-emitting Plasma: We present the results of deep Chandra and XMM-Newton X-ray imaging and
spatially-resolved spectroscopy of Abell 2256, a nearby (z=0.058) galaxy
cluster experiencing multiple mergers and displaying a rich radio morphology
domina... | astro-ph_HE |
The polarization of the boundary layer around weakly magnetized neutron
stars in X-ray binaries: X-ray binaries hosting a compact object have been among the main targets of
the Imaging X-ray Polarimetry Explorer (IXPE) since its launch, due to their
high brightness in the 2-8 keV energy band. The spectropolarimetric ... | astro-ph_HE |
Status And Highlights Of VERITAS: VERITAS (Very Energetic Radiation Imaging Telescope Array System) is an array
of atmospheric Cherenkov telescopes sensitive to very high energy (VHE)
gamma-rays above 100 GeV. Located at the Fred Lawrence Whipple Observatory in
southern Arizona, USA, the VERITAS array of four 12m-diame... | astro-ph_HE |
Importance of resolving the spectral support of beam-plasma
instabilities in simulations: Many astrophysical plasmas are prone to beam-plasma instabilities. For
relativistic and dilute beams, the {\it spectral} support of the beam-plasma
instabilities is narrow, i.e., the linearly unstable modes that grow with rates
... | astro-ph_HE |
Search for Decaying Dark Matter in the Virgo Cluster of Galaxies with
HAWC: The decay or annihilation of dark matter particles may produce a steady flux
of very-high-energy gamma rays detectable above the diffuse background. Nearby
clusters of galaxies provide excellent targets to search for the signatures of
particl... | astro-ph_HE |
Hints of the jet composition in gamma-ray bursts from dissipative
photosphere models: We present a model for gamma-ray bursts where a dissipative photosphere
provides the usual spectral peak around MeV energies accompanied by a
subdominant thermal component. We treat the initial acceleration of the jet in
a general w... | astro-ph_HE |
Indirect dark matter search in the Galactic Centre with IceCube: It is assumed that dark matter can annihilate or decay into Standard Model
particles which then can produce a neutrino flux detectable at IceCube. Such a
signal can be emitted from the Galactic Center thanks to the high density of
dark matter abundance be... | astro-ph_HE |
The interstellar environment in the outer Galaxy as seen in gamma rays
by Fermi: Gamma-ray emission produced by interactions between cosmic rays (CRs) and
interstellar gas traces the product of their densities throughout the Milky
Way. The outer Galaxy is a privileged target of investigation to separate
interstellar ... | astro-ph_HE |
Blueshifted absorption lines from X-ray reflection in IRAS 13224-3809: We explore a disc origin for the highly-blueshifted, variable absorption
lines seen in the X-ray spectrum of the Narrow Line Seyfert 1 galaxy
IRAS13224-3809. The blueshift corresponds to a velocity of about 0.25c. Such
features in other Active Galac... | astro-ph_HE |
Lorentz Factor-Isotropic Luminosity/Energy Correlations of GRBS and
Their Interpretation: The bulk Lorentz factor of the gamma-ray burst (GRB) ejecta (Gamma_0) is a
key parameter to understand the GRB physics. Liang et al. have discovered a
correlation between Gamma_0 and isotropic gamma-ray energy:
Gamma_0\proptoE_{... | astro-ph_HE |
Waves in pulsar winds: The radio, optical, X-ray and gamma-ray nebulae that surround many pulsars
are thought to arise from synchrotron and inverse Compton emission. The energy
powering this emission, as well as the magnetic fields and relativistic
particles, are supplied by a "wind" driven by the central object. The i... | astro-ph_HE |
Ultra High Energy Neutrinos: Absorption, Thermal Effects and Signatures: We study absorption of ultra high energy neutrinos by the cosmic neutrino
background, with full inclusion of the effect of the thermal distribution of
the background on the resonant annihilation channel. For a hierarchical
neutrino mass spectrum (... | astro-ph_HE |
A Photosphere-Internal Shock Model of Gamma-Ray Bursts: Case Studies of
Fermi/LAT Bursts: Radially inhomogeneous gamma-ray burst (GRB) jets release variable
photospheric emission and can have internal shocks occurring above the
photosphere. We generically formulate a photospheric emission model of GRBs
including Comp... | astro-ph_HE |
Equations of state in the Hartle-Thorne model of neutron stars selecting
acceptable variants of the resonant switch model of twin HF QPOs in the atoll
source 4U 1636-53: The Resonant Switch (RS) model of twin high-frequency quasi-periodic
oscillations (HF QPOs) observed in neutron star binary systems, based on swit... | astro-ph_HE |
The XMM-Newton survey of the Small Magellanic Cloud: Although numerous archival XMM-Newton observations existed towards the Small
Magellanic Cloud (SMC) before 2009, only a fraction of the whole galaxy was
covered. Between May 2009 and March 2010 we carried out an XMM-Newton survey of
the SMC, in order to obtain a comp... | astro-ph_HE |
The destruction and recreation of the X-ray corona in a changing-look
Active Galactic Nucleus: We present the drastic transformation of the X-ray properties of the active
galactic nucleus 1ES 1927+654, following a changing-look event. After the
optical/UV outburst the power-law component, produced in the X-ray corona... | astro-ph_HE |
Lorentz invariance violation from GRB221009A: The Large High Altitude Air Shower Observatory~(LHAASO) reported observation
of photons with energies above 10~TeV from gamma ray burst GRB221009A. A
suggestion was proposed that this result may contradict with our knowledge of
special relativity~(SR) and the standard model... | astro-ph_HE |
In-medium enhancement of the modified Urca neutrino reaction rates: We calculate modified Urca neutrino emission rates in the dense nuclear
matter in neutron star cores. We find that these rates are strongly enhanced in
the beta-stable matter in regions of the core close to the direct Urca process
threshold. This enhan... | astro-ph_HE |
Revealing the variation mechanism of ON 231 via the two-components
shock-in-jet model: The variation mechanism of blazars is a long-standing unresolved problem. In
this work, we present a scenario to explain diverse variation phenomena for ON
231, where the jet emissions are composed of the flaring and the less varia... | astro-ph_HE |
Exact analytical expression for the synchrotron radiation spectrum in
the Gaussian turbulent magnetic field: We demonstrate that the exact solution for the spectrum of synchrotron
radiation from an isotropic population of mono-energetic electrons in turbulent
magnetic field with Gaussian distribution of local field s... | astro-ph_HE |
Magnetically Confined Mountains on Accreting Neutron Stars in General
Relativity: The general relativistic formulation of the problem of magnetically confined
mountains on neutron stars is presented, and the resulting equations are solved
numerically, generalising previous Newtonian calculations. The hydromagnetic
st... | astro-ph_HE |
Very high energy gamma-ray follow-up observations of novae and dwarf
novae with the MAGIC telescopes: In the last few years the Fermi-LAT instrument has detected GeV gamma-ray
emission from several novae. Such GeV emission can be interpreted in terms of
inverse Compton emission from electrons accelerated in the shock... | astro-ph_HE |
Test of the string loop oscillation model using kHz quasiperiodic
oscillations in a neutron star binary: The model of current-carrying string loop oscillations is tested to explain
the special set of frequencies related to the high-frequency quasiperiodic
oscillations (HF QPOs) observed recently in the low-mass X-ray... | astro-ph_HE |
SN 2019zrk, a bright SN 2009ip analog with a precursor: We present photometric and spectroscopic observations of the Type IIn
supernova SN 2019zrk (also known as ZTF20aacbyec). The SN shows a $\gtrsim$ 100
day precursor, with a slow rise, followed by a rapid rise to M $\sim -19.2$ in
the $r$ and $g$ bands. The post-pea... | astro-ph_HE |
NuSTAR Hard X-ray Survey of the Galactic Center Region I: Hard X-ray
Morphology and Spectroscopy of the Diffuse Emission: We present the first sub-arcminute images of the Galactic Center above 10
keV, obtained with NuSTAR. NuSTAR resolves the hard X-ray source IGR
J17456-2901 into non-thermal X-ray filaments, molecul... | astro-ph_HE |
No evidence for a low-mass black hole in Swift J1753.5-0127: We present high-resolution, time-resolved optical spectroscopy of the black
hole X-ray transient Swift J1753.5-0127. Our optical spectra do not show
features that we can associate with the companion star. However we do observe
broad, double-peaked emission li... | astro-ph_HE |
Variable mass accretion and failed wind explain changing look phenomena
in NGC 1365: Changing look active galactic nuclei (CLAGNs) show complex nature in their
X-ray spectral shape and line of sight column density variation. The physical
mechanisms responsible for these variations are unclear. Here, we study the
spec... | astro-ph_HE |
Probing dark matter annihilation in the Galaxy with antiprotons and
gamma rays: A possible hint of dark matter annihilation has been found in Cuoco,
Korsmeier and Kr\"amer (2017) from an analysis of recent cosmic-ray antiproton
data from AMS-02 and taking into account cosmic-ray propagation uncertainties
by fitting a... | astro-ph_HE |
High-energy neutrinos from Galactic sources: Even 100 years after the discovery of cosmic rays their origin remains a
mystery. In recent years, TeV gamma-ray detectors have discovered and
investigated many Galactic sources where particles are accelerated up to
energies of 100 TeV. However, it has not been possible up t... | astro-ph_HE |
Update on the GRB universal scaling
E$_{\rm{X,iso}}$-E$_{\rm{γ,iso}}$-E$_{\rm{pk}}$ with ten years of
$Swift$ data: From a comprehensive statistical analysis of $Swift$ X-ray light-curves of
gamma-ray bursts (GRBs) collected from December 2004 to the end of 2010, we
found a three-parameter correlation between the i... | astro-ph_HE |
Modelling of blazar SEDs with the nonlinear SSC cooling process: Observations of blazar flaring states reveal remarkably different variability
time scales. Especially rapid flares with flux doubling time scales of the
order of minutes have been puzzling for quite some time. Many modeling attempts
use the well known lin... | astro-ph_HE |
The Soft State of the Black Hole Transient Source MAXI J1820+070:
Emission from the Edge of the Plunge Region?: The Galactic black hole X-ray binary MAXI J1820+070 had a bright outburst in
2018 when it became the second brightest X-ray source in the Sky. It was too
bright for X-ray CCD instruments such as XMM-Newton ... | astro-ph_HE |
New Measurement of Muon Neutrino Disappearance from the IceCube
Experiment: The IceCube Neutrino Observatory is a Cherenkov detector located at the South
Pole. Its main component consists of an in-ice array of optical modules
instrumenting one cubic kilometer of deep Glacial ice. The DeepCore
sub-detector is a denser... | astro-ph_HE |
The Origin of the Prompt Emission for Short GRB 170817A: Photosphere
Emission or Synchrotron Emission?: The first gravitational-wave event from the merger of a binary neutron star
system (GW170817) was detected recently. The associated short gamma-ray burst
(GRB 170817A) has a low isotropic luminosity ($\sim 10^{47}$... | astro-ph_HE |
First search for GeV neutrinos from bright gamma-ray solar flares using
the IceCube Neutrino Observatory: In response to a reported increase in the total neutrino flux in the
Homestake experiment in coincidence with solar flares at the end of the
eighties, solar neutrino detectors have searched for solar flare signal... | astro-ph_HE |
SN 2023emq: a flash-ionised Ibn supernova with possible CIII emissio: SN 2023emq is a fast-evolving transient initially classified as a rare Type
Icn supernova (SN), interacting with a H- and He-free circumstellar medium
(CSM) around maximum light. Subsequent spectroscopy revealed the unambiguous
emergence of narrow He... | astro-ph_HE |
Testing the rotating hot spot model using X-ray burst oscillations from
4U 1636-536: Precise and accurate measurements of neutron star masses and radii would
provide valuable information about the still uncertain properties of cold
matter at supranuclear densities. One promising approach to making such
measurements i... | astro-ph_HE |
Supernova remnants in the very-high-energy sky: prospects for the
Cherenkov Telescope Array: The Cherenkov Telescope Array is expected to lead to the detection of many
new supernova remnants in the TeV and multi-TeV range. In addition to the
individual study of each SNR, the study of these objects as a population can... | astro-ph_HE |
Neutron stars as sources of gravitational waves: The global network of ground-based gravitational-wave detectors (the Advanced
LIGO and the Advanced Virgo) is sensitive at the frequency range corresponding
to relativistic stellar-mass compact objects. Among the promising types of
gravitational-wave sources are binary s... | astro-ph_HE |
Gamma-ray burst spectra and spectral correlations from sub-photospheric
Comptonization: One of the most important unresolved issues in gamma-ray burst physics is the
origin of the prompt gamma-ray spectrum. Its general non-thermal character and
the softness in the X-ray band remain unexplained. We tackle these issues... | astro-ph_HE |
Search for fingerprints of disoriented chiral condensates in cosmic ray
showers: Although the generation of disoriented chiral condensates (DCCs), where the
order parameter for chiral symmetry breaking is misaligned with respect to the
vacuum direction in isospin state, is quite natural in the theory of strong
intera... | astro-ph_HE |
Astrophysical signatures of leptonium: More than 10^43 positrons annihilate every second in the centre of our Galaxy
yet, despite four decades of observations, their origin is still unknown. Many
candidates have been proposed, such as supernovae and low mass X-ray binaries.
However, these models are difficult to reconc... | astro-ph_HE |
Study of Asymptotic Velocity in the Bondi-Hoyle Accretion Flows in the
Domain of Kerr and 4-D Einstein-Gauss-Bonnet Gravities: Understanding the physical structures of the accreated matter very close to
the black hole in quasars and active galactic nucleus (AGNs) is an important
milestone to constrain the activities ... | astro-ph_HE |
Neutrino cooling and spin-down of rapidly rotating compact stars: The gravitational-wave instability of r-modes in rapidly rotating compact
stars is believed to spin them down to angular frequencies of about a tenth of
the Kepler frequency soon after their birth in a Supernova. We point out that
the r-mode perturbation... | astro-ph_HE |
Efficiency of Thin Magnetically-Arrested Disks Around Black Holes: The radiative and jet efficiencies of thin magnetized accretion disks around
black holes (BHs) are affected by BH spin and the presence of a magnetic field
that, when strong, could lead to large deviations from Novikov-Thorne (NT) thin
disk theory. To s... | astro-ph_HE |
Radio and X-ray observations of Five TeV SNRs: We briefly summarize recent results of five TeV SNRs from radio and X-ray
observations. We focus on remeasuring kinematic distances of 5 TeV SNRs, i.e.
HESS J1732-347/SNR G353.6-0.7 (3.2 kpc), HESS J1834-087/G23.3-0.3 (also W41,
4.0 kpc), HESS J1833-105/G21.5-0.9 (4.8 kpc)... | astro-ph_HE |
Evidence for quark-matter cores in massive neutron stars: The theory governing the strong nuclear force, Quantum Chromodynamics,
predicts that at sufficiently high energy densities hadronic nuclear matter
undergoes a deconfinement transition to a new phase of quarks and gluons.
Although this has been observed in ultrar... | astro-ph_HE |
The Correlation between Dispersion Measure and X-ray Column Density from
Radio Pulsars: Pulsars are remarkable objects that emit across the entire electromagnetic
spectrum, providing a powerful probe of the interstellar medium. In this study,
we investigate the relation between dispersion measure (DM) and X-ray
absor... | astro-ph_HE |
On the simultaneous generation of radio and soft X-ray emission by AXP
4U 0142+61: In the present paper we study the possibility of a simultaneous generation of
radio waves and soft $X$-rays by means of the quasi-linear diffusion (QLD) in
the anomalous pulsar AXP 4U 0142+61. Considering the magnetosphere composed of
... | astro-ph_HE |
GN-z11-flash in the context of Gamma-Ray Burst Afterglows: The recently discovered rapid transient GN-z11-flash has been suggested to be
the prompt-emission ultraviolet flash associated with a gamma-ray burst
serendipitously exploding in the ultra-high-$z$ galaxy GN-z11. We here place
the flash into the context of the ... | astro-ph_HE |
Extreme photometric and polarimetric variability of blazar S4 0954+65 at
its maximum optical and $γ$-ray brightness levels: In 2022 the BL Lac object S4 0954+65 underwent a major variability phase,
reaching its historical maximum brightness in the optical and $\gamma$-ray
bands. We present optical photometric and pol... | astro-ph_HE |
Swift: the science across the rainbow. Mission Overview and Highlights
of Results: I present an overview of the Swift mission, which was launched on November
20, 2004 to discover and observe the most energetic of astrophysical phenomena,
gamma-ray bursts (GRBs). After almost 6 years in space the Observatory is in
exc... | astro-ph_HE |
Highly Ionized Fe-K Absorption Line from Cygnus X-1 in the High/Soft
State Observed with Suzaku: We present observations of a transient He-like Fe K alpha absorption line in
Suzaku observations of the black hole binary Cygnus X-1 on 2011 October 5 near
superior conjunction during the high/soft state, which enable us ... | astro-ph_HE |
Broad band polarimetric follow-up of Type IIP SN 2012aw: We present the results based on R-band polarimetric follow-up observations of
the nearby (~10 Mpc) Type II-plateau SN 2012aw. Starting from ~10 days after
the SN explosion, these polarimetric observations cover ~90 days (during the
plateau phase) and are distribu... | astro-ph_HE |
Astrophysical Implications of the Binary Black-Hole Merger GW150914: The discovery of the gravitational-wave source GW150914 with the Advanced
LIGO detectors provides the first observational evidence for the existence of
binary black-hole systems that inspiral and merge within the age of the
Universe. Such black-hole m... | astro-ph_HE |
Massive protostars as gamma-ray sources: Massive protostars have associated bipolar outflows with velocities of
hundreds of km s$^{-1}$. Such outflows can produce strong shocks when interact
with the ambient medium leading to regions of non-thermal radio emission. We
aim at exploring under which conditions relativistic... | astro-ph_HE |
Impact of Massive Binary Star and Cosmic Evolution on Gravitational Wave
Observations II: Double Compact Object Rates and Properties: Making the most of the rapidly increasing population of gravitational-wave
detections of black hole (BH) and neutron star (NS) mergers requires comparing
observations with population s... | astro-ph_HE |
Reverse Shock Emission Driven By Post-Merger Millisecond Magnetar Winds:
Effects of the Magnetization Parameter: The study of short-duration gamma-ray bursts provides growing evidence that a
good fraction of double neutron star mergers lead to the formation of stable
millisecond magnetars. The launch of Poynting flux... | astro-ph_HE |
Connections Between Local and Global Turbulence in Accretion Disks: We analyze a suite of global magnetohydrodynamic (MHD) accretion disk
simulations in order to determine whether scaling laws for turbulence driven by
the magnetorotational instability, discovered via local shearing box studies,
are globally robust. The... | astro-ph_HE |
Dynamical Modeling of CXOGBS J175553.2-281633: A 10 Hour Long Orbital
Period Cataclysmic Variable: We present modeling of the long-term optical light curve and radial velocity
curve of the binary stellar system CXOGBS J175553.2-281633, first detected in
X-rays in the \textit{Chandra} Galactic Bulge Survey. We analyze... | astro-ph_HE |
Interesting Clues to Detect Hidden Tidal Disruption Events in Active
Galactic Nuclei: In the manuscript, effects of Tidal Disruption Events (TDEs) are estimated on
long-term AGN variability, to provide interesting clues to detect probable
hidden TDEs in normal broad line AGN with apparent intrinsic variability which
... | astro-ph_HE |
Gamma Ray Burst Prompt correlations: The mechanism responsible for the prompt emission of gamma-ray bursts (GRBs)
is still a debated issue. The prompt phase-related GRB correlations can allow
to discriminate among the most plausible theoretical models explaining this
emission. We present an overview of the observationa... | astro-ph_HE |
Compact Object Modeling in the Globular Cluster 47 Tucanae: The globular cluster 47~Tucanae (47~Tuc) is one of the most massive star
clusters in the Milky Way and is exceptionally rich in exotic stellar
populations. For several decades it has been a favorite target of observers,
and yet it is computationally very chall... | astro-ph_HE |
Neutron stars - thermal emitters: Confronting theoretical models with observations of thermal radiation emitted
by neutron stars is one of the most important ways to understand the properties
of both, superdense matter in the interiors of the neutron stars and dense
magnetized plasmas in their outer layers. Here we rev... | astro-ph_HE |
Approximating new ice models with B-splines for improved IceCube event
reconstruction: application to cascades and tracks: Event signatures in IceCube are complex, modulated by both particle physics
and properties of the ice and detector. Event reconstruction thus requires
accurate modeling of ice properties and dete... | astro-ph_HE |
Inferring spin tilts at formation from gravitational wave observations
of binary black holes: Interfacing precession-averaged and orbit-averaged
spin evolution: Two important parameters inferred from the gravitational wave signals of
binaries of precessing black holes are the spin tilt angles, i.e., the angles
at w... | astro-ph_HE |
Discovery of a 26.2 day period in the long-term X-ray light curve of SXP
1323: a very short orbital period for a long spin period pulsar: Context. About 120 Be/X-ray binaries (BeXBs) are known in the Small
Magellanic Cloud (SMC); about half of them are pulsating with periods from a
few to hundreds of seconds. SXP 132... | astro-ph_HE |
Magnetic Deflections of Ultra-High Energy Cosmic Rays from Centaurus A: We present the results of a study that simulates trajectories of ultra-high
energy cosmic rays from Centaurus A to Earth, for particle rigidities from $E/Z
= 2$ EV to 100 EV, i.e., covering the possibility of primary particles as heavy
as Fe nuclei... | astro-ph_HE |
The pulsar synchrotron: coherent radio emission: We propose a simple physical picture for the generation of coherent radio
emission in the axisymmetric pulsar magnetosphere that is quite different from
the canonical paradigm of radio emission coming from the magnetic polar caps.
In this first paper we consider only the... | astro-ph_HE |
GRB 090510: a short burst from a massive star ?: GRB afterglow 090510 is (so far) the best-monitored afterglow in the optical,
X-ray, and above 100 MeV, measurements covering 2-3 decades in time at each
frequency. Owing to its power-law temporal decay and power-law spectrum, it
seems very likely that the highest energy... | astro-ph_HE |
A joint spectro-imaging analysis of the XMM-Newton and HESS observations
of the supernova remnant RX J1713.7-3946: The supernova remnant (SNR) RX J1713.7-3946 (also known as G347.3-0.5) is
part of the class of remnants dominated by synchrotron emission in X-rays. It
is also one of the few shell-type SNRs observed at ... | astro-ph_HE |
Spectral and morphological analysis of the remnant of Supernova 1987A
with ALMA & ATCA: We present a comprehensive spectral and morphological analysis of the remnant
of Supernova (SN) 1987A with the Australia Telescope Compact Array (ATCA) and
the Atacama Large Millimeter/submillimeter Array (ALMA). The non-thermal a... | astro-ph_HE |
Gravitational wave astronomy of single sources with a pulsar timing
array: Abbreviated:
We investigate the potential of detecting the gravitational wave from
individual binary black hole systems using pulsar timing arrays (PTAs) and
calculate the accuracy for determining the GW properties. This is done in a
consist... | astro-ph_HE |
Optical and Radio Variability of the Blazar S4 0954+658: We present an optical-to-radio study of the BL Lac object S4 0954+658
observations during 1998-2023. The measurements were obtained with the SAO RAS
Zeiss-1000 1-m and AS-500/2 0.5-m telescopes in 2003-2023, with the RATAN-600
radio telescope at 1.25 (0.96, 1.1),... | astro-ph_HE |
Discovery of the Optical Counterparts to Four Energetic Fermi
Millisecond Pulsars: In the last few years, over 43 millisecond radio pulsars have been discovered
by targeted searches of unidentified gamma-ray sources found by the Fermi
Gamma-Ray Space Telescope. A large fraction of these millisecond pulsars are in
com... | astro-ph_HE |
Search for Gravitational Waves Associated with Fast Radio Bursts
Detected by CHIME/FRB During the LIGO--Virgo Observing Run O3a: We search for gravitational-wave transients associated with fast radio bursts
(FRBs) detected by the Canadian Hydrogen Intensity Mapping Experiment Fast
Radio Burst Project (CHIME/FRB), dur... | astro-ph_HE |
The nova-like nebular optical spectrum of V404 Cygni at the beginning of
the 2015 outburst decay: We report on FORS2 optical spectroscopy of the black hole X-ray binary V404
Cygni, performed at the very beginning of its 2015 outburst decay, complemented
by quasi-simultaneous $Swift$ X-ray and ultra-violet as well as ... | astro-ph_HE |
Time-dependent neutrino emission from Mrk 421 during flares and
predictions for IceCube: Blazars are prime candidate sources for the high energy neutrinos recently
detected by IceCube. Being one of the brightest sources in the extragalactic
X-ray and $\gamma$-ray sky as well as one of the nearest blazars to Earth, Mr... | astro-ph_HE |
QPO-jet relation in X-ray binaries: In the past years, a clear picture of the evolution of outbursts of
black-hole X-ray binaries has emerged. While the X-ray properties can be
classified into our distinct states, based on spectral and timing properties,
the observations in the radio band have shown strong links betwee... | astro-ph_HE |
Detection of diffuse gamma-ray emission near the young massive cluster
NGC 3603: We report the Fermi Large Area Telescope's detection of extended gamma-ray
emission towards the direction of the young massive star cluster NGC 3603. The
emission shows a hard spectrum with a photon index of 2.3 from 1 GeV to 250
GeV. Th... | astro-ph_HE |
Insight-HXMT, NuSTAR and INTEGRAL Data Show Disk Truncation in the Hard
State of the Black-Hole X-Ray Binary MAXI J1820+070: We study X-ray and soft gamma-ray spectra from the hard state of the
accreting black-hole binary MAXI J1820+070. We perform analysis of joint
spectra from HXMT, NuSTAR and INTEGRAL. We find an ... | astro-ph_HE |
Constraining cosmic-ray acceleration in the magnetospheric gaps of Sgr
A*: Sagittarius A* (Sgr A*) is a potential VHE gamma-ray and cosmic-ray source.
We examine limits to gap-type particle acceleration in the magnetosphere of Sgr
A*, showing that in the current phase of activity proton acceleration to PeV
energies i... | astro-ph_HE |
Is the energy generation rate of nuclear reactions in hot accretion
flows important?: The temperature of hot accretion flows around black holes is sufficiently
high for the ignition of nuclear reactions. This is potentially an important
nucleosynthesis mechanism in the universe. As the first step in studying this
pro... | astro-ph_HE |
High-energy electromagnetic offline follow-up of LIGO-Virgo
gravitational-wave binary coalescence candidate events: We present two different search methods for electromagnetic counterparts to
gravitational-wave (GW) events from ground-based detectors using archival NASA
high-energy data from the Fermi-GBM and RXTE-AS... | astro-ph_HE |
The power-law component of the X-ray emissions from pulsar wind nebulae
and their pulsars: To look for possible phenomenological connections between pulsar's timing
properties and emissions from pulsar wind nebulae and their pulsars, we studied
the power-law component of the X-ray emissions from 35 pulsar wind nebula... | astro-ph_HE |
Evidence for a change in the radiation mechanism in the hard state of
GRO J1655-40. Hysteresis in the broad-band noise components: We have analysed RXTE archival data to study the aperiodic variability of the
black-hole binary GRO J1655-40 during the hard state of the 2005 outburst. We
computed the 0.008-64 Hz power ... | astro-ph_HE |
Constraints on the X-ray Luminosity Function of AGN at z=5.7-6.4 with
the Extragalactic Serendipitous Swift Survey: X-ray luminosity functions (XLFs) of Active Galactic Nuclei (AGN) trace the
growth and evolution of supermassive black hole populations across cosmic time,
however, current XLF models are poorly constra... | astro-ph_HE |
A Luminous Gamma-ray Binary in the Large Magellanic Cloud: Gamma-ray binaries consist of a neutron star or a black hole interacting with
a normal star to produce gamma-ray emission that dominates the radiative output
of the system. Only a handful of such systems have been previously discovered,
all within our Galaxy. H... | astro-ph_HE |
Search for transitions between states in redbacks and black widows using
seven years of Fermi-LAT observations: Considering about seven years of Fermi-Large Area Telescope (LAT) data, we
present a systematic search for variability possibly related to transitions
between states in redbacks and black widow systems. Tra... | astro-ph_HE |
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