output
19922026
most citedFirst Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way

1.9k citations

Showing 2025 · astro-ph.HEShow all

14 papers · 2 filters

astro-ph.HE2025★ 4 cited

Probing jet base emission of M87* with the 2021 Event Horizon Telescope observations

Saurabh, Hendrik Müller, Sebastiano D. von Fellenberg +282

We investigate the presence and spatial characteristics of the jet base emission in M87* at 230 GHz, enabled by the enhanced uv coverage in the 2021 Event Horizon Telescope (EHT) o…

astro-ph.HE2025★ 1 cited

Aql X-1 from dawn 'til dusk: the early rise, fast state transition and decay of its 2024 outburst

A. Marino, F. Coti Zelati, K. Alabarta +36

Transient Low-Mass X-ray Binaries (LMXBs) are usually first detected by all-sky X-ray monitors when they enter new outbursts, typically at X-ray luminosities above 10…

astro-ph.HE2025★ 20 cited

Horizon-scale variability of M87* from 2017--2021 EHT observations

The Event Horizon Telescope Collaboration

We report three epochs of polarized images of M87* at 230\,GHz using data from the Event Horizon Telescope (EHT) taken in 2017, 2018, and 2021. The baseline coverage of the 2021 ob…

astro-ph.HE2025★ 12 cited

GRB 250702B: Discovery of a Gamma-Ray Burst from a Black Hole Falling into a Star

Eliza Neights, Eric Burns, Chris L. Fryer +52

Gamma-ray bursts are the most luminous electromagnetic events in the universe. Their prompt gamma-ray emission has typical durations between a fraction of a second and several minu…

astro-ph.HE2025

An unusual type-I X-ray burst from the neutron star X-ray binary IGR J17591-2342: a double-photospheric-radius-expansion burst?

Sudip Bhattacharyya, Akshay Singh, Andrea Sanna

Type-I X-ray bursts observed from neutron stars originate from intermittent unstable thermonuclear burning of accreted matter on these stars. Such bursts, particularly those reachi…

astro-ph.HE2025★ 4 cited

Origin of the ring ellipticity in the black hole images of M87*

Rohan Dahale, Ilje Cho, Kotaro Moriyama +273

We investigate the origin of the elliptical ring structure observed in the images of the supermassive black hole M87*, aiming to disentangle contributions from gravitational, astro…

astro-ph.HE2025★ 1 cited

High energy time lags of Gamma Ray Bursts

C. Maraventano, G. Ghirlanda, L. Nava +5

Positive lags between the arrival time of different photon energies are commonly observed in Gamma-Ray Bursts (GRBs), where soft photons lag behind harder ones. However, some GRBs…

astro-ph.HE2025★ 2 cited

NICER observations of type-I X-ray bursts from the ultra-compact X-ray binary M15 X-2

María Alejandra Díaz Teodori, Jari J. E. Kajava, Celia Sánchez-Fernández +3

Type-I X-ray bursts are thermonuclear explosions caused by the unstable burning of accreted material on the surface of neutron stars. We report the detection of seven type-I X-ray…

astro-ph.HE2025★ 2 cited

Identification and characterisation of the gamma-ray counterpart of the transitional pulsar candidate CXOU J110926.4-650224

A. Manca, F. Coti Zelati, J. Li +9

Transitional millisecond pulsars (tMSPs) represent a crucial link between the rotation-powered and accretion-powered states of binary pulsars. During their active X-ray state, tMSP…

astro-ph.HE2025★ 11 cited

A new pulsating neutron star in the Ultraluminous X-ray source NGC 4559 X7?

F. Pintore, C. Pinto, G. Rodriguez-Castillo +17

Ultraluminous X-ray sources (ULX) are extragalactic objects with X-ray luminosities above the Eddington limit for a 10 Msun black hole (BH). ULXs may host super-Eddington accreting…

astro-ph.HE2025★ 4 cited

On testing in-vacuo dispersion with the most energetic neutrinos: KM3-230213A case study

Giovanni Amelino-Camelia, Giacomo D'Amico, Giuseppe Fabiano +4

The phenomenology of in-vacuo dispersion, an effect such that quantum properties of spacetime slow down particles proportionally to their energies, has been a very active research…

astro-ph.HE2025★ 6 cited

Disk reflection and energetics from the accreting millisecond pulsar SRGA J144459.2-604207

Christian Malacaria, Alessandro Papitto, Sergio Campana +11

Accreting millisecond pulsars (AMSPs) are excellent laboratories to study reflection spectra and their features from an accretion disk truncated by a rapidly rotating magnetosphere…

astro-ph.HE2025★ 10 cited

The putative center in NGC 1052

Anne-Kathrin Baczko, Matthias Kadler, Eduardo Ros +284

Many active galaxies harbor powerful relativistic jets, however, the detailed mechanisms of their formation and acceleration remain poorly understood. To investigate the area of je…

astro-ph.HE2025★ 6 cited

Energy-resolved pulse profile changes in V 0332+53: Indications of wings in the cyclotron absorption line profile

Antonino D'Aì, Dimitrios K. Maniadakis, Carlo Ferrigno +15

We aim to investigate the energy-resolved pulse profile changes of the accreting X-ray pulsar V 0332+53, focusing in the cyclotron line energy range, using the full set of availabl…