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19912026
Showing 2025 · astro-ph.HEShow all

41 papers · 2 filters

astro-ph.HE2025★ 1 cited

Wind-mediated Eddington-limited emission in a Black Hole Tidal Disruption Event

Paola Martire, Elena Maria Rossi, Nicholas Chamberlain Stone +3

Observations of tidal disruption events (TDEs) have already produced tens of strong candidate flares, and their number will greatly increase with upcoming wide field surveys. Never…

astro-ph.HE2025

Constraints on the Population of Common Sources of Gravitational Waves and High-Energy Neutrinos with IceCube During the Third Observing Run of the LIGO and Virgo Detectors

Doğa Veske, Zsuzsa Márka, Albert Zhang

The discovery of joint sources of high-energy neutrinos and gravitational waves has been a primary target for the LIGO, Virgo, KAGRA, and IceCube observatories. The joint detection…

astro-ph.HE2025★ 8 cited

The Radius of PSR J0437-4715 from NICER Data

M. C. Miller, A. J. Dittmann, I. M. Holt +12

Neutron star Interior Composition Explorer (NICER) data have been used to estimate the masses and radii of the rotation-powered millisecond pulsars PSR J00300451, PSR J074066…

astro-ph.HE2025★ 3 cited

Multiple outflows and delayed ejections revealed by early imaging of novae

Elias Aydi, John D. Monnier, Antoine Mérand +39

Novae are thermonuclear eruptions on accreting white dwarfs in interacting binaries. Although most of the accreted envelope is expelled, the mechanism -- impulsive ejection, multip…

astro-ph.HE2025

Superluminal Wave Activation at Relativistic Magnetized Shocks

Jens F. Mahlmann, Logan Eskildsen, Arno Vanthieghem +2

Fast radio bursts (FRBs) are extremely energetic radio transients, some are generated in magnetar magnetospheres and winds. Despite a growing number of observations, their emission…

astro-ph.HE2025

New and updated timing models for seven young energetic X-ray pulsars, including the Big Glitcher PSR J0537-6910

Wynn C. G. Ho, Lucien Kuiper, Cristobal M. Espinoza +6

We present new timing models and update our previous ones for the rotational evolution of seven young energetic pulsars, including four of the top five in spin-down luminosity Edot…

astro-ph.HE2025

Self-confinement of relativistic pair beams in magnetized interstellar plasmas: the case of pulsar X-ray filaments

Luca Orusa, Lorenzo Sironi

The observation of filamentary X-ray structures near bow-shock pulsar wind nebulae (PWNe) -- such as the Guitar, Lighthouse, and PSR J20304415 nebulae -- and of slow-diffusion r…

astro-ph.HE2025

Deep Learning Analysis of Ions Accelerated at Shocks

Paxson Swierc, Damiano Caprioli, Luca Orusa +1

We study the application of deep learning techniques to the analysis and classification of ions accelerated at collisionless shocks in hybrid (kinetic ions--fluid electrons) simula…

astro-ph.HE2025★ 3 cited

Search for GeV-scale Dark Matter from the Galactic Center with IceCube-DeepCore

The IceCube Collaboration, R. Abbasi, M. Ackermann +431

Models describing dark matter as a novel particle often predict that its annihilation or decay into Standard Model particles could produce a detectable neutrino flux in regions of…

astro-ph.HE2025★ 2 cited

Acceleration of Heavy Ions at Non-Relativistic Collisionless Shocks

Damiano Caprioli, Luca Orusa, Miha Cernetic +2

We investigate the process of Diffusive Shock Acceleration (DSA) of particles with mass number to charge number ratios , e.g., partially-ionized heavy ions. To this end, w…

astro-ph.HE2025★ 2 cited

Unveiling the soft X-ray source population towards the inner Galactic disk with XMM-Newton

Tong Bao, Gabriele Ponti, Frank Haberl +5

Across the Galactic disk lies a diverse population of X-ray sources, with the fainter end remaining poorly understood due to past survey sensitivity limits. We aim to classify and…

astro-ph.HE2025★ 3 cited

Constraints on Axion-Like Particles from VERITAS Observations of a Flaring Radio Galaxy in the Perseus Cluster

C. B. Adams, A. Archer, P. Bangale +62

Background: Axion-like particles (ALPs) are hypothetical particles that emerge in numerous theoretical extensions to the Standard Model. Their coupling to electromagnetic field imp…

astro-ph.HE2025★ 12 cited

Evidence for Neutrino Emission from X-Ray-bright Active Galactic Nuclei with IceCube

R. Abbasi, M. Ackermann, J. Adams +429

Recently, IceCube reported neutrino emission from the Seyfert galaxy NGC 1068. Using 13.1 years of IceCube data, we present a follow-up search for neutrino sources in the northern…

astro-ph.HE2025★ 3 cited

Luminous Fast Blue Optical Transients as "Failed" Gravitational-wave Sources: Helium CoreBlack Hole Mergers Following Delayed Dynamical Instability

Jakub Klencki, Brian D. Metzger

Binaries in which a massive donor star undergoes an extended ( kyr) phase of stable mass transfer onto a black hole (BH) accretor offer a promising channel for creating LI…

astro-ph.HE2025★ 2 cited

The very faint X-ray transient Swift J174610-290018 at the Galactic center

Giovanni Stel, Gabriele Ponti, Nathalie Degenaar +17

Very Faint X-ray Transients (VFXTs) are a class of X-ray binary systems that exhibit occasional outbursts with peak X-ray luminosities (L_X< 1e36 erg s^-1) much lower than typical…

astro-ph.HE2025★ 1 cited

Characterizing the host galaxies and delay times of Ca-rich gap transients vs 91bg-like SNe and normal Type Ia SNe

Peter Scherbak, Abigail Polin, Mansi Kasliwal +4

Calcium-rich gap transients are a faint, fast-evolving class of supernovae that show strong nebular Ca emission lines. Their progenitor systems are uncertain, but they are often as…

astro-ph.HE2025★ 1 cited

New determination of the neutrino hadronic production cross sections from GeV to beyond PeV energies

Luca Orusa, Mattia Di Mauro, Fiorenza Donato

The flux of astrophysical neutrinos is now measured with unprecedented accuracy and over several decades of energy spectrum. Their origin traces back to hadronic collisions between…

astro-ph.HE2025

Testing Magnetic Field Configurations in Spider Pulsar PSR J1723-2837 with IXPE

Michela Negro, Haocheng Zhang, Niccolò Di Lalla +4

We present the first X-ray polarimetry observations of a redback millisecond pulsar binary, PSR J1723-2837, with the Imaging X-ray Polarimetry Explorer (IXPE). We conduct a spectro…

astro-ph.HE2025★ 5 cited

Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS

LAT Collaboration, S. Abdollahi, L. Baldini +586

Dwarf spheroidal galaxies (dSphs) are excellent targets for indirect dark matter (DM) searches using gamma-ray telescopes because they are thought to have high DM content and a low…

astro-ph.HE2025

Simulation-Based Inference for Direction Reconstruction of Ultra-High-Energy Cosmic Rays with Radio Arrays

Oscar Macias, Zachary Mason, Matthew Ho +3

Ultra-high-energy cosmic-ray (UHECR) observatories require unbiased direction reconstruction to enable multi-messenger astronomy with sparse, nanosecond-scale radio pulses. Explici…

astro-ph.HE2025★ 3 cited

What determines the -ray luminosities of classical novae?

Peter Craig, Elias Aydi, Laura Chomiuk +25

Classical novae in the Milky Way have now been well-established as high-energy GeV -ray sources. In novae with main-sequence companions, this emission is believed to result from…

astro-ph.HE2025

Multi-wavelength Study of HESS J0632+057: New Insights into Pulsar-Disk Interaction

Jaegeun Park, Hongjun An, Chanho Kim +60

We present an analysis of new multi-wavelength observations of the TeV gamma-ray binary HESS J0632+057, conducted using SALT, Swift, NuSTAR, and VERITAS in 2023--2024. By combining…

astro-ph.HE2025★ 33 cited

Relativistic Magnetic Reconnection in Astrophysical Plasmas: A Powerful Mechanism of Nonthermal Emission

Lorenzo Sironi, Dmitri A. Uzdensky, Dimitrios Giannios

Magnetic reconnection -- a fundamental plasma physics process, where magnetic field lines of opposite polarity annihilate -- is invoked in astrophysical plasmas as a powerful mecha…

astro-ph.HE2025★ 3 cited

Einstein Probe discovery of the short period intermediate polar EP J115415.8-501810

Y. Xiao, M. Ge, N. Rea +21

The X-ray transient source EP240309a/EP\,J115415.8501810 was first detected by the Wide-Field X-ray Telescope (WXT) on board Einstein Probe (EP) during the commissioning phase.…