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19922026
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1,540 papers · 1 filter

astro-ph.HE2026

Gravitational Wave Modeling of White-Dwarf--Compact-Object Binaries and Observational Outlook

Tristan S. Weaver, David Radice, Donghui Jeong +1

We investigate the end stages of circular white-dwarf--compact-object binaries by developing a novel integrator implementing mass transfer and 2.5-order Post-Newtonian kinematics.…

astro-ph.HE2026

Long-period radio transient PSR J0901-4046 is not an Isolated White Dwarf Pulsar

Maxim Lyutikov, Mukremin Kilic, Alexander Wolszczan +1

We report the {\it Chandra} non-detection of PSR J09014046, a seconds long-period radio transient (LPT). For a distance of 467 pc, the upper limit on X-ray luminosity…

astro-ph.HE2026

Radio Follow Up of a Sub-threshold GRB in the Sky Localization Area of GW241125

Natalie Gottschlich, Alessandra Corsi, S. Bradley Cenko +5

Since the Fermi satellite's identification of a candidate -ray burst (GRB) temporally coincident with GW150914, several tentative, and often debated, associations between electr…

astro-ph.HE2026★ 1 cited

Strong X-ray Variability of I Zwicky 1: Obscuration from Clumpy Accretion-Disk Winds

Jian Huang, Bin Luo, W. N. Brandt +2

Obscuration from clumpy accretion-disk winds has been invoked to explain the extreme X-ray weakness and X-ray variability observed in a substantial fraction of super-Eddington accr…

astro-ph.HE2026★ 1 cited

Hyperaccreting Neutron Stars inside Massive Envelopes: The Implausibility of Thorne-Żytkow Objects

Patrick Chi-Kit Cheong, David Radice, Christopher L. Fryer

The evolution of neutron stars (NSs) embedded within massive stellar envelopes is a critical phase in binary stellar evolution, potentially leading to the formation of Thorne-Żytko…

astro-ph.HE2026

Search for TeV emission from spider millisecond pulsars with HAWC

R. Alfaro, E. Anita-Rangel, M. Araya +90

Millisecond pulsars (MSPs) are observed to emit multi-wavelength radiation, from radio to GeV. Spider MSPs, which interact with their low-mass companion in close orbit (orbital per…

astro-ph.HE2026

Gravitational Wave Measurement of the - Intrinsic Scatter at High Redshift

Cayenne Matt, Kayhan Gültekin, Gabriella Agazie +109

The observed GWB spectrum is higher in amplitude than model predictions by a factor of 2-3. Using a semi-analytic model, we evaluate the effect of a high-scatter supermassive black…

astro-ph.HE2026★ 1 cited

Gamma-ray Signatures of r-Process Radioactivity from the Collapse of Magnetized White Dwarfs

Tetyana Pitik, Yong-Zhong Qian, David Radice +1

We predict the gamma-ray line emission from -process nuclei synthesized in the ejecta of the accretion-induced collapse (AIC) of a magnetized, rapidly rotating white dwarf. Usin…

astro-ph.HE2026★ 1 cited

Multimessenger Characterization of High-Energy Neutrino Emission from the Brightest Neutrino-Active Galactic Nuclei

Jose Alonso Carpio, Ali Kheirandish, Kohta Murase

The observation of high-energy neutrinos from the direction of the nearby active galaxy, NGC 1068, was a major step in identifying the origin of high-energy cosmic neutrinos. The m…

astro-ph.HE2026

Interpreting Swift and NuSTAR Observations of the Low-Luminosity Active Galactic Nucleus NGC 4278 with Radiatively Inefficient Accretion Flows and Implications for Neutrino Emission

Abhishek Das, Qi Feng, Eleanor Young +3

We report the first NuSTAR hard X-ray observations of the low-luminosity active galactic nucleus NGC 4278. The source is clearly detected beyond 10 keV with a hard X-ray spectrum c…

astro-ph.HE2026★ 2 cited

ASKAP J005512.2-255834: A Luminous, Long-Lived Radio Transient at z = 0.1 -- an Orphan Afterglow or an off-nuclear TDE from an IMBH?

Ashna Gulati, Tara Murphy, David L. Kaplan +24

We report the discovery of a slowly evolving, extragalactic radio transient, ASKAP J005512.2--255834 (hereafter ASKAP J0055-2558), identified using the Australian SKA Pathfinder in…

astro-ph.HE2026★ 3 cited

Collapse of Magnetized White Dwarfs as site of Heavy Element Formation and Kilonova Signal

Tetyana Pitik, David Radice, Daniel Kasen +3

We present the first end-to-end calculation connecting the accretion-induced collapse (AIC) of a magnetized, rapidly rotating white dwarf to observable kilonova signatures, combini…

astro-ph.HE2026★ 1 cited

TDE 2025abcr: A Tidal Disruption Event in the Outskirts of a Massive Galaxy

Robert Stein, Jonathan Carney, Charlotte Ward +27

Tidal disruption events (TDEs) have traditionally been discovered in optical sky surveys through targeted searches of nuclear transients. However, it is expected that some TDEs wil…

astro-ph.HE2026

Physical origin of very-high-energy gamma rays from the low-luminosity active galactic nucleus NGC 4278 and implications for neutrino observations

Shilong Chen, Abhishek Das, B. Theodore Zhang +3

Relativistic jets in active galactic nuclei (AGNs) are known to accelerate particles to extreme energies, yet the physical origin of very-high-energy (VHE) emission from low-lumino…

astro-ph.HE2026

Predicting Multiwavelength Emission Associated with X-Ray Flares and Extended Emission of Gamma-Ray Bursts

Riki Matsui, Shigeo S. Kimura, Kohta Murase +1

Gamma-ray bursts (GRBs) are one of the most extreme transients in the universe, but their explosion and emission mechanism remains unclear. To investigate the nature of GRB jets, h…

astro-ph.HE2026★ 1 cited

Little Red Dots as Hidden Neutrino Sources

Riku Kuze, Kunihito Ioka, Kohta Murase +2

Little Red Dots (LRDs) are enigmatic, compact, red galaxies at high redshift, -, discovered by the James Webb Space Telescope. Broad emission lines in the absence of X-…

astro-ph.HE2026★ 1 cited

Exploring Composition Mixing in Kilonova Ejecta with Ray-by-ray Simulations

Ruocheng Zhai, David Radice, Fabio Magistrelli +2

Binary neutron star merger (BNSM) ejecta are considered a primary repository of -process nucleosynthesis and a source of the observed heavy-element abundances. We implement comp…

astro-ph.HE2025★ 1 cited

Classification of a New X-ray Catalog of Likely Counterparts to 4FGL-DR4 Unassociated Gamma-ray Sources Using a Neural Network

Kyle D. Neumann, Abraham D. Falcone, Stephen DiKerby +5

Our survey of the fourth Large Area Telescope catalog (4FGL) unassociated gamma-ray source regions using the X-Ray Telescope (XRT) and Ultraviolet/Optical Telescop…

astro-ph.HE2025

The first 10years of the HAWC Gamma-Ray Observatory: science results

Anna Lia Longinotti, HAWC Collaboration

The High-Altitude Water Cherenkov (HAWC) Observatory, located on the slopes of the Sierra Negra volcano in Mexico, began operations in March 2015. Over the past decade, HAWC has en…

astro-ph.HE2025

Particle Astrophysics with High and Ultrahigh Energy Neutrinos

Ke Fang, Kohta Murase

We summarize recent results of the observations of high (1 TeV-100 PeV) and ultrahigh ( PeV) energy neutrinos, including the detection of a diffuse cosmic high-energy neu…

astro-ph.HE2025★ 1 cited

Neutron star heating vs. HST observations

Luis E. Rodríguez, Andreas Reisenegger, Denis González-Caniulef +5

Passively cooling neutron stars (NSs) should reach undetectably low surface temperatures K in less than yr. However, HST observations have revealed likely thermal…

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★ 4 cited

Observation of In-ice Askaryan Radiation from High-Energy Cosmic Rays

ARA Collaboration, N. Alden, S. Ali +74

We present the first experimental evidence for in-ice Askaryan radiation -- coherent charge-excess radio emission -- from high-energy particle cascades developing in the Antarctic…

astro-ph.HE2025★ 3 cited

Evidence of Energy Injection in the Short and Distant GRB 250221A in a High Density Environment

Camila Angulo-Valdez, Rosa L. Becerra, Ramandeep Gill +29

We present the photometric and spectroscopic analysis of the short-duration GRB 250221A ( s), using a data set from the optical facilities COLIBRÍ, the Harlingt…