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19932026
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293 papers · 1 filter

astro-ph.HE2026

Fast Optical Variability of the TeV Blazar PKS 1725+123 Observed by SVOM-VT and Insights from Multi-wavelength Follow-up Observations

Shuo-Yu Liu, Yu-Wei Yu, Ji-Shun Lian +29

PKS 1725+123 is a flat-spectrum radio quasar (FSRQ) with a redshift of . The detection of this object in the TeV band was reported by the MAGIC telescopes and H.E.S.S. in…

astro-ph.HE2026★ 1 cited

Multi-epoch afterglow rebrightenings in GRB 250129A: Evidence for successive shock interactions

D. Akl, S. Antier, H. Koehn +105

Most long gamma-ray bursts (GRBs) exhibit afterglows broadly consistent with external forward-shock emission, typically described by smooth broken power-law decays in the multiband…

astro-ph.HE2025

Optimizing the potential of KM3NeT in detecting core-collapse supernovae

KM3NeT Collaboration, O. Adriani, A. Albert +285

Core-collapse supernovae mark the end of life of massive stars. However, despite their importance in astrophysics, their underlying mechanisms remain unclear. Neutrinos that emerge…

astro-ph.HE2025★ 2 cited

Harnessing the XMM-Newton data: X-ray spectral modelling of 4XMM-DR11 detections and 4XMM-DR11s sources

A. Viitanen, G. Mountrichas, H. Stiele +13

The XMM-Newton X-ray observatory has played a prominent role in astrophysics, conducting precise and thorough observations of the X-ray sky for the past two decades. The most recen…

astro-ph.HE2025★ 4 cited

Born to be recycled: a comprehensive population synthesis of the Galactic millisecond pulsars

Mattéo Sautron, Jérôme Pétri, Dipanjan Mitra +2

Millisecond pulsars (MSPs) are the oldest but fastest pulsars known to date. In the 1980s, to explain how these pulsars could be formed, a new hypothesis was formulated: the recycl…

astro-ph.HE2025

Constraining gamma-ray burst parameters with the first ultra-high energy neutrino event KM3-230213A

KM3NeT Collaboration, O. Adriani, A. Albert +278

Context: The detection of the highest energy neutrino observed to date by KM3NeT, with an estimated energy of 220 PeV, opens up new possibilities for the study and identification o…

astro-ph.HE2025★ 1 cited

The spin-orbit alignment hypothesis in millisecond pulsars

Alexandra Lorange, Jérôme Pétri, Mattéo Sautron +1

Millisecond pulsars (MSPs) are spun up during their accretion phase in a binary system. The exchange of angular momentum between the accretion disk and the star tends to align the…

astro-ph.HE2025★ 4 cited

Stellar properties indicating the presence of hyperons in neutron stars

Andreas Bauswein, Aristeidis Nikolaidis, Georgios Lioutas +7

We describe distinctive stellar features indicating the presence of hyperons in neutron stars as compared to purely nucleonic systems. A strongly negative curvature of the mass-rad…

astro-ph.HE2025★ 6 cited

Crust (Unified) Tool for Equation-of-state Reconstruction (CUTER) v2

P. J. Davis, H. Dinh Thi, A. F. Fantina +3

The equation of state (EoS) is a needed input to determine the neutron-star global properties and to relate them. It is thus important to provide consistent and unified EoSs to avo…

astro-ph.HE2025★ 8 cited

X-ray Polarization of the High-Synchrotron-Peak BL Lacertae Object 1ES 1959+650 during Intermediate and High X-ray Flux States

Luigi Pacciani, Dawoon E. Kim, Riccardo Middei +97

We report the Imaging X-ray Polarimetry Explorer (IXPE) polarimetric and simultaneous multiwavelength observations of the high-energy-peaked BL Lacertae (HBL) object 1ES 1959+650,…

astro-ph.HE2025★ 11 cited

Limits on the Ejecta Mass During the Search for Kilonovae Associated with Neutron Star-Black Hole Mergers: A case study of S230518h, GW230529, S230627c and the Low-Significance Candidate S240422ed

M. Pillas, S. Antier, K. Ackley +78

Neutron star-black hole (NSBH) mergers, detectable via their gravitational-wave (GW) emission, are expected to produce kilonovae (KNe). Four NSBH candidates have been identified an…

astro-ph.HE2025★ 6 cited

The Galactic population of magnetars : a simulation-based inference study

Mattéo Sautron, Alexander Eli McEwen, George Younes +3

Population synthesis modeling of the observed dynamical and physical properties of a population is a highly effective method for constraining the underlying birth parameters and ev…

astro-ph.HE2024★ 10 cited

IXPE Observation of the Low-Synchrotron Peaked Blazar S4 0954+65 During An Optical-X-ray Flare

Pouya M. Kouch, Ioannis Liodakis, Francesco Fenu +134

The X-ray polarization observations made possible with the Imaging X-ray Polarimetry Explorer (IXPE) offer new ways of probing high-energy emission processes in astrophysical jets…

astro-ph.HE2024

A Two-Week Monitoring Campaign on Mrk 421

W. Peter Maksym, Ioannis Liodakis, M. Lynne Saade +153

X-ray polarization is a unique new probe of the particle acceleration in astrophysical jets made possible through the Imaging X-ray Polarimetry Explorer. Here we report on the firs…

astro-ph.HE2024★ 18 cited

A second view on the X-ray polarization of NGC 4151 with IXPE

V. E. Gianolli, S. Bianchi, E. Kammoun +21

We report on the second observing program of the active galactic nucleus NGC 4151 with simultaneous Imaging X-ray Polarimetry Explorer (IXPE; {\sim}750 ks), NuSTAR ({\sim}60 ks), X…

astro-ph.HE2024★ 15 cited

Probing the polarized emission from SMC X-1: the brightest X-ray pulsar observed by IXPE

Sofia V. Forsblom, Sergey S. Tsygankov, Juri Poutanen +101

Recent observations of X-ray pulsars (XRPs) performed by the Imaging X-ray Polarimetry Explorer (IXPE) have made it possible to investigate the intricate details of these objects i…

astro-ph.HE2024★ 14 cited

Discovery of a shock-compressed magnetic field in the north-western rim of the young supernova remnant RX J1713.7-3946 with X-ray polarimetry

Riccardo Ferrazzoli, Dmitry Prokhorov, Niccolò Bucciantini +99

Supernova remnants (SNRs) provide insights into cosmic-ray acceleration and magnetic field dynamics at shock fronts. Recent X-ray polarimetric measurements by the Imaging X-ray Pol…

astro-ph.HE2024★ 2 cited

Localisation of the non-thermal X-ray emission of PSR~J2229+6114 from its multi-wavelength pulse profiles

J. Pétri, S. Guillot, L. Guillemot +5

Pulsars are detected over the whole electromagnetic spectrum, from radio wavelengths up to very high energies, in the GeV-TeV range. Whereas the radio emission site for young pulsa…

astro-ph.HE2024★ 16 cited

Studying geometry of the ultraluminous X-ray pulsar Swift J0243.6+6124 using X-ray and optical polarimetry

Juri Poutanen, Sergey S. Tsygankov, Victor Doroshenko +108

Discovery of pulsations from a number of ULXs proved that accretion onto neutron stars can produce luminosities exceeding the Eddington limit by several orders of magnitude. The co…

astro-ph.HE2024★ 11 cited

Atmospheric muons measured with the KM3NeT detectors in comparison with updated numeric predictions

KM3NeT Collaboration

The measurement of the flux of muons produced in cosmic ray air showers is essential for the study of primary cosmic rays. Such measurements are important in extensive air shower d…

astro-ph.HE2024★ 18 cited

X-ray polarization measurement of the gold standard of radio-quiet active galactic nuclei : NGC 1068

F. Marin, A. Marinucci, M. Laurenti +102

We used the Imaging X-ray Polarimetry Explorer (IXPE) satellite to measure, for the first time, the 2-8 keV polarization of NGC 1068. We pointed IXPE for a net exposure time of 1.1…

astro-ph.HE2024★ 32 cited

Astronomy potential of KM3NeT/ARCA

S. Aiello, A. Albert, M. Alshamsi +275

The KM3NeT/ARCA neutrino detector is currently under construction at 3500 m depth offshore Capo Passero, Sicily, in the Mediterranean Sea. The main science objectives are the detec…

astro-ph.HE2024★ 33 cited

Detection of X-ray Polarization from the Blazar 1ES 1959+650 with the Imaging X-ray Polarimetry Explorer

Manel Errando, Ioannis Liodakis, Alan P. Marscher +142

Observations of linear polarization in the 2-8 keV energy range with the Imaging X-ray Polarimetry Explorer (IXPE) explore the magnetic field geometry and dynamics of the regions g…

astro-ph.HE2024★ 12 cited

First Study of the Supernova Remnant Population in the Large Magellanic Cloud with eROSITA

Federico Zangrandi, Katharina Jurk, Manami Sasaki +11

The study of the entire population of SNRs in a galaxy helps us to understand the underlying stellar populations, the environments, in which the SNRs are evolving, and the stellar…