THE UNIFIED SEYFERT SCHEME AND THE ORIGIN OF THE COSMIC X-RAY-BACKGROUND

Authors
MADAU P GHISELLINI G FABIAN AC
Citation
P. Madau et al., THE UNIFIED SEYFERT SCHEME AND THE ORIGIN OF THE COSMIC X-RAY-BACKGROUND, Monthly Notices of the Royal Astronomical Society, 270(2), 1994, pp. 120000017-120000021
Citations number
51
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Monthly Notices of the Royal Astronomical Society → ACNP
ISSN journal
00358711
Volume
270
Issue
2
Year of publication
1994
Pages
120000017 - 120000021
Database
ISI
SICI code
0035-8711(1994)270:2<120000017:TUSSAT>2.0.ZU;2-E
Abstract
We discuss a simple model for the cosmic X-ray background (XRB), based on the unified Seyfert scheme. We show that a mixture of unabsorbed t ype 1 and absorbed type 2 Seyferts, integrated in redshift back to z = 3.5, can simultaneously reproduce the spectrum of the XRB from 1 to 1 50 keV and the source counts in both the soft and hard X-ray bands. Th e presence of numerous, heavily obscured sources with hard spectra at a flux level of 10(-12) erg cm(-2) s(-1) is indicated as a test of the model, in view of forthcoming ASCA observations.