A CENSUS OF X-RAY NUCLEAR ACTIVITY IN NEARBY GALAXIES
A CENSUS OF X-RAY NUCLEAR ACTIVITY IN NEARBY GALAXIES
We have studied the X-ray nuclear activity of 187 nearby (distance < 15 Mpc) galaxies observed with Chandra/ACIS. We found that 86 of them have a point-like X-ray core, consistent with an accreting black hole (BH). We argue that the majority of them are nuclear BHs, rather than X-ray binaries. …