2010-09-10

finding AGN

At group meeting today, Renbin Yan (NYU) talked about finding AGN by X-ray and optical criteria. He has an optical color criterion that can replace the NII to H-alpha part of the BPT diagram; it works surprisingly well. He also showed that some supposed classes of AGN that are X-ray bright or X-ray faint are just the undetected edges of a broad distribution.

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