An online tool for fitting the X-ray background and estimating the contribution of Compton-thick AGN
Abstract
We investigate the constraints that can be placed on the fraction of Compton-thick AGN in the Universe from the modeling of the spectrum of the diffuse X-ray background (XRB) in the 3-100 keV band in combination with the number counts in the 10-40 keV band. We estimate an intrinsic Compton-thick fraction of 15±5 % (1sigma ) among all AGN, averaged over all luminosities. At the flux limit of the NUSTAR mission ( ∼10-14 erg cm-2 s-1 , 10-40 keV) this translates to about half a Compton-thick source per field of view.
- Publication:
-
Memorie della Societa Astronomica Italiana
- Pub Date:
- 2013
- Bibcode:
- 2013MmSAI..84..679A
- Keywords:
-
- X-rays: diffuse background;
- X-rays:general