THE FIRST OPTICAL VALIDATION OF AN X-RAY LINE-EMITTING OBJECT: A DETECTION IN THE XMM-NEWTON OBSERVATION OF THE CHANDRA DEEP FIELD-SOUTH

摘要

We present the first optical validation of an X-ray line-emitting object (XLEO) discovered in the XMM-Newton observation of the Chandra Deep Field-South. The object is an active galactic nucleus at z_x ～ 0.66. An optical spectrum of the source indeed confirms and refines (z_0 = 0.665) the redshift obtained from the X-ray line. The X-ray and optical properties of the source are presented and discussed.