Mass without radiation: Heavily obscured AGNs, the X-ray background, and the black hole mass density

Author: Comastri A.   Gilli R.   Marconi A.   Risaliti G.   Salvati M.  

Publisher: Edp Sciences

E-ISSN: 1432-0746|574|issue|L10-L10

ISSN: 0004-6361

Source: Astronomy & Astrophysics, Vol.574, Iss.issue, 2015-02, pp. : L10-L10

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Abstract