The X-ray background and the evolution of AGN

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dc.creatorPompilio, Fulvio
dc.creatorLa Franca, Fabio
dc.creatorMatt, Giorgio
dc.date1999-09-23
dc.date.accessioned2026-07-25T21:16:34Z
dc.descriptionWe discuss the constraints on the AGN evolution from the cosmic X-ray background and source counts. A synthesis model to fit the X-ray background is presented. In the model, the spectrum of type 2 AGN has been modeled including Compton down--scattering within the absorbing material. Besides, we introduced a dependence on redshift of the relative number of obscured sources and found a decrease of the fraction of type 2 AGN at redshifts larger than 2.
dc.description8 pages, 7 figures, accepted for pubblication in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/9909390
dc.identifierhttp://arxiv.org/abs/astro-ph/9909390
dc.identifier.urihttps://dspace.dare.co.zw/handle/123456789/77962
dc.subjectAstrophysics
dc.titleThe X-ray background and the evolution of AGN
dc.typetext

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