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19922026
Showing 2024 · astro-ph.HEShow all

82 papers · 2 filters

astro-ph.HE2024★ 3 cited

AstroSat timing and spectral analysis of the accretion-powered millisecond X-ray pulsar IGR J17591--2342

Akshay Singh, Andrea Sanna, Sudip Bhattacharyya +5

IGR J17591--2342, a transient accretion-powered millisecond X-ray pulsar, was discovered during its 2018 outburst. Here, we present a timing and spectral analysis of the source usi…

astro-ph.HE2024★ 4 cited

Hadronic particle acceleration in the supernova remnant SN 1006 as traced by Fermi-LAT observations

M. Lemoine-Goumard, F. Acero, J. Ballet +1

The supernova remnant SN 1006 is a source of high-energy particles detected at radio, X-rays, and tera-electronvolt gamma rays. It was also announced as a source of gamma rays by F…

astro-ph.HE2024

Isolated neutron stars as Science Validation for XMM2ATHENA: Ensuring robust data for future X-ray Astronomy

Adriana Mancini Pires, Christian Motch, Axel Schwope +9

The discovery of radio-quiet, X-ray thermally emitting isolated neutron stars (XINSs) in the ROSAT All-Sky Survey revealed a previously overlooked component of the neutron star pop…

astro-ph.HE2024★ 94 cited

The MeerKAT Pulsar Timing Array: The first search for gravitational waves with the MeerKAT radio telescope

Matthew T. Miles, Ryan M. Shannon, Daniel J. Reardon +22

Pulsar Timing Arrays search for nanohertz-frequency gravitational waves by regularly observing ensembles of millisecond pulsars over many years to look for correlated timing residu…

astro-ph.HE2024★ 45 cited

The MeerKAT Pulsar Timing Array: The -year data release and the noise and stochastic signals of the millisecond pulsar population

Matthew T. Miles, Ryan M. Shannon, Daniel J. Reardon +21

Pulsar timing arrays are ensembles of regularly observed millisecond pulsars timed to high precision. Each pulsar in an array could be affected by a suite of noise processes, most…

astro-ph.HE2024★ 18 cited

Neutrinos from stochastic acceleration in black hole environments

M. Lemoine, F. Rieger

Recent experimental results from the IceCube detector and their phenomenological interpretation suggest that the magnetized turbulent corona of nearby X-ray luminous Seyfert galaxi…

astro-ph.HE2024★ 2 cited

Long term monitoring of FRB~20121102 with the Nançay Radio Telescope and multi-wavelength campaigns including INTEGRAL

C. Gouiffés, C. Ng, I. Cognard +12

The origin(s) of Fast Radio Bursts (FRBs), mysterious radio bursts coming from extragalactic distances, remains unknown. Multi-wavelength observations are arguably the only way to…

astro-ph.HE2024★ 20 cited

High-Statistics Measurement of the Cosmic-Ray Electron Spectrum with H.E.S.S

F. Aharonian, F. Ait Benkhali, J. Aschersleben +144

Owing to their rapid cooling rate and hence loss-limited propagation distance, cosmic-ray electrons and positrons (CRe) at very high energies probe local cosmic-ray accelerators an…

astro-ph.HE2024★ 4 cited

Multi-wavelength study of OT 081: broadband modelling of a transitional blazar

MAGIC Collaboration, H. Abe, S. Abe +270

OT 081 is a well-known, luminous blazar that is remarkably variable in many energy bands. We present the first broadband study of the source which includes very-high-energy (VHE, $…

astro-ph.HE2024

Intergalactic magnetism in a gamma-ray beam as a model of Porphyrion

A. Neronov, F. Vazza, A. Brandenburg +1

We estimate the magnetic field in the jets of the recently discovered 7 Mpc long Porphyrion system. We use non-detection of the system in gamma-rays to derive a lower bound on the…

astro-ph.HE2024★ 27 cited

Measurement of Very-high-energy Diffuse Gamma-ray Emissions from the Galactic Plane with LHAASO-WCDA

The LHAASO Collaboration, Zhen Cao, F. Aharonian +312

The diffuse Galactic gamma-ray emission is a very important tool used to study the propagation and interaction of cosmic rays in the Milky Way. In this work, we report the measurem…

astro-ph.HE2024★ 1 cited

Explanation of the exceptionally strong timing noise of PSR J0337+1715 by a circum-ternary planet and consequences for gravity tests

Guillaume Voisin, Ismaël Cognard, Melaine Saillenfest +6

Context: Timing of pulsar PSR J0337+1715 provides a unique opportunity to test the strong equivalence principle (SEP) with a strongly self-gravitating object. This is due to its un…

astro-ph.HE2024★ 16 cited

Particle acceleration and multi-messenger radiation from Ultra-Luminous X-ray Sources: A new class of Galactic PeVatrons

Enrico Peretti, Maria Petropoulou, Georgios Vasilopoulos +1

Super-Eddington accretion onto stellar-mass compact objects powers fast outflows in ultra-luminous X-ray sources (ULXs). Such outflows, which can reach mildly relativistic velociti…

astro-ph.HE2024★ 9 cited

Ultra-high-energy cosmic rays from ultra-fast outflows of active galactic nuclei

Domenik Ehlert, Foteini Oikonomou, Enrico Peretti

We investigate ultra-fast outflows (UFOs) in active galactic nuclei (AGN) as potential sources of ultra-high-energy cosmic rays (UHECRs). We focus on cosmic-ray nuclei, an aspect n…

astro-ph.HE2024

Detection of two TeV gamma-ray outbursts from NGC 1275 by LHAASO

Zhen Cao, F. Aharonian, Axikegu +275

The Water Cherenkov Detector Array (WCDA) is one of the components of Large High Altitude Air Shower Observatory (LHAASO) and can monitor any sources over two-thirds of the sky for…

astro-ph.HE2024★ 2 cited

SN 1885A and supernova remnants in the centre of M31 with LOFAR

Deepika Venkattu, Peter Lundqvist, Miguel Pérez Torres +4

We present the first LOFAR image of the centre of M31 at a frequency of 150 MHz. We clearly detect three supernova remnants, which, along with archival VLA data at 3 GHz and other…

astro-ph.HE2024★ 21 cited

Einstein Probe discovery of EP240408a: a peculiar X-ray transient with an intermediate timescale

Wenda Zhang, Weimin Yuan, Zhixing Ling +136

We report the discovery of a peculiar X-ray transient, EP240408a, by Einstein Probe (EP) and follow-up studies made with EP, Swift, NICER, GROND, ATCA and other ground-based multi-…

astro-ph.HE2024

Analytic insight into the physics of SASI I. Shock instability in a non-rotating stellar core

T. Foglizzo

During the core collapse of a massive star just before its supernova explosion, the amplification of asymmetric motions by the standing accretion shock instability (SASI) imprints…

astro-ph.HE2024

Multi-messenger signature of cosmic rays from the microquasar V4641 Sgr propagating along a Galactic Magnetic Field line

Andrii Neronov, Foteini Oikonomou, Dmitri Semikoz

The recently detected extended, very-high-energy gamma-ray emission from the microquasar V4641 Sgr reveals a puzzling 200-parsec-long jet-like structure significantly misaligned wi…

astro-ph.HE2024★ 2 cited

A simple model of dust extinction in gamma-ray burst host galaxies

N. A. Rakotondrainibe, V. Buat, D. Turpin +4

Gamma-ray burst (GRB) afterglows are powerful probes for studying the different properties of their host galaxies (e.g., the interstellar dust) at all redshifts. By fitting their s…

astro-ph.HE2024★ 2 cited

A new method of reconstructing images of gamma-ray telescopes applied to the LST-1 of CTAO

CTA-LST Project, :, K. Abe +305

Imaging atmospheric Cherenkov telescopes (IACTs) are used to observe very high-energy photons from the ground. Gamma rays are indirectly detected through the Cherenkov light emitte…

astro-ph.HE2024

Hidden by a star: the redshift and the offset broad line of the Flat Spectrum Radio Quasar PKS 0903-57

P. Goldoni, C. Boisson, S. Pita +5

Context: PKS 0903-57 is a little-studied gamma-ray blazar which has recently attracted considerable interest due to the strong flaring episodes observed since 2020 in HE (100 MeV <…

astro-ph.HE2024★ 7 cited

Insights from the first flaring activity of a high-synchrotron-peaked blazar with X-ray polarization and VHE gamma rays

MAGIC Collaboration, K. Abe, S. Abe +250

We study a flaring activity of the HSP Mrk421 that was characterized from radio to very-high-energy (VHE; E TeV) gamma rays with MAGIC, Fermi-LAT, Swift, XMM-Newton and sever…

astro-ph.HE2024★ 2 cited

Characterization and classification of -ray bursts from blazars

Matteo Cerruti

Blazars are the most common sources of -ray photons in the extragalactic sky. Their -ray light curves are characterized by bright flaring episodes, similarly to what is obser…