By Didier Barret and M.Cappi

Active Galactic Nuclei (AGN) display complex X-ray spectra which exhibit

By Franco Vazza

In "Detecting shocked intergalactic gas with X-ray and radio observations” (A&A

By Elias Kammoun

The origin of the cosmic X-ray background (CXB) is still under debate

By Christopher S. Reynolds

The spin of a black hole retains the memory of how