4 papers
Testing the Weak Equivalence Principle near black holes
Rittick Roy, Askar B. Abdikamalov, Dimitry Ayzenberg +3
Today we have quite stringent constraints on possible violations of the Weak Equivalence Principle from the comparison of the acceleration of test-bodies of different composition i…
Impact of the returning radiation on the analysis of the reflection spectra of black holes
Shafqat Riaz, Michal Szanecki, Andrzej Niedzwiecki +2
A fraction of the electromagnetic radiation emitted from the surface of a geometrically thin and optically thick accretion disk of a black hole returns to the disk because of the s…
Modeling bias in supermassive black hole spin measurements
Shafqat Riaz, Dimitry Ayzenberg, Cosimo Bambi +1
X-ray reflection spectroscopy (or iron line method) is a powerful tool to probe the strong gravity region of black holes, and currently is the only technique for measuring the spin…
Reflection spectra of thick accretion disks
Shafqat Riaz, Dimitry Ayzenberg, Cosimo Bambi +1
Relativistic reflection features are commonly observed in the X-ray spectra of stellar-mass and supermassive black holes and originate from illumination of the inner part of the ac…