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arXiv:astro-ph/0011341 (astro-ph)
[Submitted on 17 Nov 2000]

Title:Testing current synthesis models of the X-ray background

Authors:R. Gilli (Univ. Firenze, AIP), M. Salvati (Oss. Arcetri), G. Hasinger (AIP)
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Abstract: We present synthesis models of the X-ray background where the available X-ray observational constraints are used to derive information on the AGN population properties. We show the need for luminous X-ray absorbed AGNs, the QSO2s, in reproducing the 2-10 keV source counts at relatively bright fluxes. We compare a model where the evolution of absorbed AGNs is faster than that of unabsorbed ones, with a standard model where absorbed and unabsorbed AGNs evolve at the same rate. It is found that an increase by a factor of ~2 from z=0 to z~1.3 in the ratio between absorbed and unabsorbed AGNs would provide a significant improvement in the data description. Finally, we make predictions on the AGNs to be observed in deep X-ray surveys which contain information on the AGN space density at high redshift.
Comments: 11 pages with 8 figures, A&A accepted
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0011341
  (or arXiv:astro-ph/0011341v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0011341
Journal reference: Astron.Astrophys.366:407-417,2001
Related DOI: https://doi.org/10.1051/0004-6361%3A20000105

Submission history

From: Roberto Gilli [view email]
[v1] Fri, 17 Nov 2000 15:29:07 UTC (152 KB)
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