Supermassive Black Hole Accretion History Inferred from a Large Sample of Chandra Hard X-ray Sources

We describe the optical, near-infrared, and radio properties of a sample of hard (2 − 7 keV) X-ray sources detected in a deep Chandra observation of the field surrounding the Abell 370 cluster. We combine these data with similar observations of the Chandra Deep Field-North and the Hawaii Survey Field SSA13 to obtain a sample of 69 hard X-ray sources (45 are… CONTINUE READING