output
19922026
Showing 2021 · astro-ph.HEShow all

104 papers · 2 filters

astro-ph.HE2021★ 13 cited

A MeerKAT, e-MERLIN, H.E.S.S. and Swift search for persistent and transient emission associated with three localised FRBs

James O. Chibueze, M. Caleb, L. Spitler +156

We report on a search for persistent radio emission from the one-off Fast Radio Burst (FRB) 20190714A, as well as from two repeating FRBs, 20190711A and 20171019A, using the MeerKA…

astro-ph.HE2021★ 15 cited

H.E.S.S. follow-up observations of Binary Black Hole Coalescence events during the second and third Gravitational Waves observing runs of Advanced LIGO and Advanced Virgo

H. E. S. S. collaboration, :, H. Abdalla +151

We report on the observations of four well-localized binary black hole (BBH) mergers by the High Energy Stereoscopic System (H.E.S.S.) during the second and third observing runs of…

astro-ph.HE2021★ 11 cited

Limit on intergalactic magnetic field from ultra-high-energy cosmic ray hotspot in Perseus-Pisces region

Andrii Neronov, Dmitri Semikoz, Oleg Kalashev

Telescope Array collaboration has reported an evidence for existence of a source of ultra-high-energy cosmic ray (UHECR) events in Perseus-Pisces supercluster. We show that the mer…

astro-ph.HE2021★ 263 cited

Strong-field Gravity Tests with the Double Pulsar

M. Kramer, I. H. Stairs, R. N. Manchester +27

Continued observations of the Double Pulsar, PSR J0737-3039A/B, consisting of two radio pulsars (A and B) that orbit each other with a period of 2.45hr in a mildly eccentric (e=0.0…

astro-ph.HE2021★ 12 cited

Simulations of Stochastic Long-Term Variability in Leptonic Models for External-Compton and Synchrotron Self-Compton Dominated Blazars

Hannes Thiersen, Michael Zacharias, Markus Böttcher

In this work we investigate the nature of multi-wavelength variability of blazars from a purely numerical approach. We use a time-dependent one-zone leptonic blazar emission model…

astro-ph.HE2021★ 3 cited

Exploring the MeV Sky with a Combined Coded Mask and Compton Telescope: The Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO)

Elena Orlando, Eugenio Bottacini, Alexander Moiseev +33

The sky at MeV energies is currently poorly explored. Here we present an innovative mission concept that builds on and improves past and currently proposed missions at such energie…

astro-ph.HE2021★ 2 cited

Researching of magnetic cutoff for local sources of charged particles in the halo of the Galaxy

M. Yu. Khlopov, A. O. Kirichenko, A. G. Mayorov

Models of highly inhomogeneous baryosynthesis of the baryonic asymmetric Universe allow for the existence of macroscopic domains of antimatter, which could evolve in a globular clu…

astro-ph.HE2021★ 8 cited

A NuSTAR observation of the eclipsing binary system OAO 1657-415: The revival of the cyclotron line

Enzo A. Saavedra, Federico A. Fogantini, Jorge A. Combi +2

OAO 1657-415 is an accreting X-ray pulsar with a high mass companion that has been observed by several telescopes over the years, in different orbital phases. Back in 1999, observa…

astro-ph.HE2021★ 4 cited

Detectability of large correlation length inflationary magnetic field with Cherenkov telescopes

Alexander Korochkin, Andrii Neronov, Guilhem Lavaux +2

Magnetic fields occupying the voids of the large scale structure may be a relic from the Early Universe originating from either Inflation or from cosmological phase transitions. We…

astro-ph.HE2021★ 7 cited

Studying the influence of external photon fields on blazar spectra using a one-zone hadro-leptonic time-dependent model

Michael Zacharias

The recent associations of neutrinos with blazars require the efficient interaction of relativistic protons with ambient soft photon fields. However, along side the neutrinos gamma…

astro-ph.HE2021★ 53 cited

Noise analysis in the European Pulsar Timing Array data release 2 and its implications on the gravitational-wave background search

A. Chalumeau, S. Babak, A. Petiteau +49

The European Pulsar Timing Array (EPTA) collaboration has recently released an extended data set for six pulsars (DR2) and reported evidence for a common red noise signal. Here we…

astro-ph.HE2021★ 41 cited

Search for Gravitational Waves Associated with Gamma-Ray Bursts Detected by Fermi and Swift During the LIGO-Virgo Run O3b

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1632

We search for gravitational-wave signals associated with gamma-ray bursts detected by the Fermi and Swift satellites during the second half of the third observing run of Advanced L…

astro-ph.HE2021★ 31 cited

Radio and X-ray observations of giant pulses from XTE J1810-197

M. Caleb, K. Rajwade, G. Desvignes +6

We present the results of two years of radio and X-ray monitoring of the magnetar XTE J1810197 since the radio re-activation in late 2018. Single pulse analysis of radio observa…

astro-ph.HE2021★ 18 cited

The Variability of the Black-Hole Image in M87 at the Dynamical Time Scale

Kaushik Satapathy, Dimitrios Psaltis, Feryal Ozel +235

The black-hole images obtained with the Event Horizon Telescope (EHT) are expected to be variable at the dynamical timescale near their horizons. For the black hole at the center o…

astro-ph.HE2021★ 96 cited

All-sky search for gravitational wave emission from scalar boson clouds around spinning black holes in LIGO O3 data

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1669

This paper describes the first all-sky search for long-duration, quasi-monochromatic gravitational-wave signals emitted by ultralight scalar boson clouds around spinning black hole…

astro-ph.HE2021★ 74 cited

Searches for Gravitational Waves from Known Pulsars at Two Harmonics in the Second and Third LIGO-Virgo Observing Runs

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1694

We present a targeted search for continuous gravitational waves (GWs) from 236 pulsars using data from the third observing run of LIGO and Virgo (O3) combined with data from the se…

astro-ph.HE2021★ 26 cited

The population of merging compact binaries inferred using gravitational waves through GWTC-3

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1634

We report on the population properties of compact binary mergers inferred from gravitational-wave observations of these systems during the first three LIGO-Virgo observing runs. Th…

astro-ph.HE2021★ 43 cited

MRI-driven dynamos in protoneutron stars

Alexis Reboul-Salze, Jérôme Guilet, Raphaël Raynaud +1

Magnetars are highly magnetized neutron stars that can produce X-ray and soft gamma-ray emissions and that have a dipole of G to G. A promising mechanism for ex…

astro-ph.HE2021★ 34 cited

Multi-messenger-Athena Synergy White Paper

L. Piro, M. Ahlers, A. Coleiro +30

In this paper we explore the scientific synergies between Athena and some of the key multi-messenger facilities that should be operative concurrently with Athena. These facilities…

astro-ph.HE2021★ 282 cited

Common-red-signal analysis with 24-yr high-precision timing of the European Pulsar Timing Array: Inferences in the stochastic gravitational-wave background search

S. Chen, R. N. Caballero, Y. J. Guo +49

We present results from the search for a stochastic gravitational-wave background (GWB) as predicted by the theory of General Relativity using six radio millisecond pulsars from th…

astro-ph.HE2021★ 29 cited

What can be learnt from UHECR anisotropies observations? Paper I : large-scale anisotropies and composition features

D. Allard, J. Aublin, B. Baret +1

We investigate the implications of the current data regarding large scale anisotropies, and examine to what extent they can be used to constrain the origin of UHECRs and the astrop…

astro-ph.HE2021★ 54 cited

A snapshot of the oldest AGN feedback phases

M. Brienza, T. W. Shimwell, F. de Gasperin +19

Active Galactic Nuclei (AGN) inject large amounts of energy into their host galaxies and surrounding environment, shaping their properties and evolution. In particular, AGN jets in…

astro-ph.HE2021★ 5 cited

Possible Detection of X-Ray Emitting Circumstellar Material in the Synchrotron-Dominated Supernova Remnant RX J 1713.7-3946

Dai Tateishi, Satoru Katsuda, Yukikatsu Terada +4

We report on a discovery of an X-ray emitting circumstellar material knot inside the synchrotron dominant supernova remnant (SNR) RX J1713.7-3946. This knot was previously thought…

astro-ph.HE2021★ 13 cited

Searching for TeV gamma-ray emission from SGR\,1935+2154 during its 2020 X-ray and radio bursting phase

H. E. S. S. Collaboration, :, H. Abdalla +251

Magnetar hyperflares are the most plausible explanation for fast radio bursts (FRB) -- enigmatic powerful radio pulses with durations of several milliseconds and high brightness te…