1998/09/07 by A. Comastri, Comastri, A.
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics (astro-ph) #FOS: Physical sciences #Gamma-ray bursts and supernovae #Particle Detector Development and Performance #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9809077
4 pages, 3 figures, Latex macros memsait.sty, epsf.sty, to be pubblished in the proceedings of the conference "Dal nano- al Tera-eV: tutti i colori degli AGN", third Italian conference on AGNs, Roma, May 18-21 1998, Memorie S.A.It
arxiv created 1998/09/07 · openalex publication_date 1998/09/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The recent deep X-ray surveys at both soft (0.5--2 keV) and hard (2--10 keV) energies have greatly extended our knowledge of the X-ray source density and spectral shapes at relatively faint fluxes adding further evidence on the fact that discrete sources, mainly AGNs, are responsible for the X-ray background (XRB) emission over a broad energy range. In addition the first complete optically identified samples of soft X-ray sources are becoming available allowing to test the XRB AGN synthesis models in the light of recent results. In this paper I will briefly compare the model predictions with some new observational data.