We review the properties and behavior of 20 X-ray binaries that contain a dynamically-
confirmed black hole, 17 of which are transient systems. During the past decade, many of …

Relativistic reflection features are commonly observed in the X-ray spectra of accreting black
holes. In the presence of high quality data and with the correct astrophysical model, X-ray …

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 …

The current interests in the universe motivate us to go beyond Einstein's General theory of
relativity. One of the interesting proposals comes from a new class of teleparallel gravity …

In this work, we attempt to find an anisotropic solution for a compact star generated by
gravitational decoupling in f (Q)-gravity theory having a null complexity factor. To do this, we …

According to the no-hair theorem, all astrophysical black holes are fully described by their
masses and spins. This theorem can be tested observationally by measuring (at least) three …

Stellar-mass black holes and neutron stars represent extremes in gravity, density, and
magnetic fields. They therefore serve as key objects in the study of multiple frontiers of …

Kerr black holes are among the most intriguing predictions of Einstein's general relativity
theory,. These rotating massive astrophysical objects drag and intermix their surrounding …

We investigate how the total radio luminosity of AGN-powered radio sources depends on
their accretion luminosity and the central black hole mass. Our studies cover about 7 orders …

We present an analysis of the observed broad iron line feature and putative warm absorber
in the long 2001 XMM-Newton observation of the Seyfert 1.2 galaxy MCG-06-30-15. The …