activity
20242026
most citedImpact of Geant4's Electromagnetic Physics Constructors on Accuracy and Performance of Simulations for Rare Event Searches

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astro-ph.HE2025

FRB 20250316A: A Brilliant and Nearby One-Off Fast Radio Burst Localized to 13 parsec Precision

FRB Collaboration, Thomas C. Abbott, Daniel Amouyal +83

Precise localizations of a small number of repeating fast radio bursts (FRBs) using very long baseline interferometry (VLBI) have enabled multiwavelength follow-up observations rev…

astro-ph.HE2025

X-ray emission from helium star+black hole binaries as probes of tidally induced spin-up of second-born black holes

Koushik Sen, Aleksandra Olejak, Sambaran Banerjee

Tidally induced spin-up of stripped helium stars in short-period (<\,1\,d) binaries with black holes has been presented as one of the possible mechanisms to reproduce the high-spin…

astro-ph.HE2024

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

Whispering in the dark: Faint X-ray emission from black holes with OB star companions

Koushik Sen, Ileyk El Mellah, Norbert Langer +3

Context. Recent astrometric and spectroscopic surveys of OB stars have revealed a few stellar-mass black holes (BHs) with orbital periods as low as 10 days. No X-ray counterpart ha…

astro-ph.HE2024

Unified properties of supermassive black hole winds in radio-quiet and radio-loud AGN

S. Mestici, F. Tombesi, M. Gaspari +2

Powerful supermassive black hole (SMBH) winds in the form of ultra-fast outflows (UFOs) are detected in the X-ray spectra of several active galactic nuclei (AGN) seemingly independ…