Reverberation map** of active galactic nuclei: From X-ray corona to dusty torus

EM Cackett, MC Bentz, E Kara - Iscience, 2021‏ - cell.com
The central engines of active galactic nuclei (AGNs) are powered by accreting supermassive
black holes, and while AGNs are known to play an important role in galaxy evolution, the key …

Observational constraints on black hole spin

CS Reynolds - Annual Review of Astronomy and Astrophysics, 2021‏ - annualreviews.org
The spin of a black hole is an important quantity to study, providing a window into the
processes by which a black hole was born and grew. Furthermore, spin can be a potent …

The nuclear spectroscopic telescope array (NuSTAR) high-energy X-ray mission

FA Harrison, WW Craig, FE Christensen… - The Astrophysical …, 2013‏ - iopscience.iop.org
ABSTRACT The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on
2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates in …

The ATHENA X-ray integral field unit (X-IFU)

D Barret, TL Trong, JW Den Herder… - … 2016: Ultraviolet to …, 2016‏ - spiedigitallibrary.org
The X-ray Integral Field Unit (X-IFU) on board the Advanced Telescope for High-ENergy
Astrophysics (Athena) will provide spatially resolved high-resolution X-ray spectroscopy …

An embedded X-ray source shines through the aspherical AT 2018cow: revealing the inner workings of the most luminous fast-evolving optical transients

R Margutti, BD Metzger, R Chornock… - The Astrophysical …, 2019‏ - iopscience.iop.org
We present the first extensive radio to γ-ray observations of a fast-rising blue optical
transient, AT 2018cow, over its first∼ 100 days. AT 2018cow rose over a few days to a peak …

Extremal Kerr black holes as amplifiers of new physics

GT Horowitz, M Kolanowski, GN Remmen, JE Santos - Physical Review Letters, 2023‏ - APS
We show that extremal Kerr black holes are sensitive probes of new physics. Stringy or
quantum corrections to general relativity are expected to generate higher-curvature terms in …

Improved reflection models of black hole accretion disks: treating the angular distribution of X-rays

J García, T Dauser, A Lohfink, TR Kallman… - The Astrophysical …, 2014‏ - iopscience.iop.org
ABSTRACT X-ray reflection models are used to constrain the properties of the accretion
disk, such as the degree of ionization of the gas and the elemental abundances. In …

A global view of the inner accretion and ejection flow around super massive black holes-Radiation-driven accretion disk winds in a physical context

M Giustini, D Proga - Astronomy & Astrophysics, 2019‏ - aanda.org
Context. Understanding the physics and geometry of accretion and ejection around super
massive black holes (SMBHs) is important to understand the evolution of active galactic …

The role of the reflection fraction in constraining black hole spin

T Dauser, J Garcia, ML Parker… - Monthly Notices of the …, 2014‏ - academic.oup.com
In many active galaxies, the X-ray reflection features from the innermost regions of the
accretion disc are relativistically distorted. This distortion allows us to measure parameters of …

Testing black hole candidates with electromagnetic radiation

C Bambi - Reviews of Modern Physics, 2017‏ - APS
Astrophysical black hole candidates are thought to be the Kerr black holes of general
relativity, but there is not yet direct observational evidence that the spacetime geometry …