activity
20172026
most citedGravitational Test Beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole

347 citations · 538 across the 12 of their papers we have counts for

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Showing astro-ph.HEShow all

6 papers · 1 filter

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.HE2023★ 3 cited

The High Energy X-ray Probe (HEX-P): Bringing the Cosmic X-ray Background into Focus

Francesca Civano, Xiurui Zhao, Peter Boorman +29

Since the discovery of the cosmic X-ray background (CXB), astronomers have strived to understand the accreting supermassive black holes (SMBHs) contributing to its peak in the 10-4…

astro-ph.HE2023★ 1 cited

The High Energy X-ray Probe (HEX-P): Probing the physics of the X-ray corona in active galactic nuclei

E. Kammoun, A. M. Lohfink, M. Masterson +28

The hard X-ray emission in active galactic nuclei (AGN) and black hole X-ray binaries is thought to be produced by a hot cloud of electrons referred to as the corona. This emission…

astro-ph.HE2020★ 67 cited

Monitoring the Morphology of M87* in 2009-2017 with the Event Horizon Telescope

Maciek Wielgus, Kazunori Akiyama, Lindy Blackburn +26

The Event Horizon Telescope (EHT) has recently delivered the first resolved images of M87*, the supermassive black hole in the center of the M87 galaxy. These images were produced…

astro-ph.HE2020★ 26 cited

Observations of Four Nearby X-ray Faint AGN: Low Luminosity or Heavy Obscuration?

A. Annuar, D. M. Alexander, P. Gandhi +20

We present observations of four active galactic nuclei (AGN) located within 15 Mpc. These AGN, namely ESO 121-G6, NGC 660, NGC 3486 and NGC 5195, have observed X-ray lumin…

astro-ph.HE2017★ 38 cited

X-ray bolometric corrections for Compton-thick active galactic nuclei

M. Brightman, M. Baloković, D. R. Ballantyne +16

We present X-ray bolometric correction factors, (), for Compton-thick (CT) active galactic nuclei (AGN) with the aim of testing AGN torus models, prob…