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The nature of the unresolved extragalactic soft CXB

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arxiv 1208.4105 v2 pith:C3NLJDBF submitted 2012-08-20 astro-ph.CO astro-ph.GAastro-ph.HE

N. Cappelluti , P. Ranalli , M. Roncarelli , P. Arevalo , G. Zamorani A. Comastri , R. Gilli , E. Rovilos , C. Vignali
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V. Allevato A. Finoguenov T. Miyaji F. Nicastro I. Georgantopoulos A. Kashlinsky
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In this paper we investigate the power spectrum of the unresolved 0.5-2 keV CXB with deep Chandra 4 Ms observations in the CDFS. We measured a signal which, on scales >30", is significantly higher than the Shot-Noise and is increasing with the angular scale. We interpreted this signal as the joint contribution of clustered undetected sources like AGN, Galaxies and Inter-Galactic-Medium (IGM). The power of unresolved cosmic sources fluctuations accounts for \sim 12% of the 0.5-2 keV extragalactic CXB. Overall, our modeling predicts that \sim 20% of the unresolved CXB flux is made by low luminosity AGN, \sim 25% by galaxies and \sim 55% by the IGM (Inter Galactic Medium). We do not find any direct evidence of the so called Warm Hot Intergalactic Medium (i.e. matter with 10^5K<T<10^7K and density contrast {\delta} <1000), but we estimated that it could produce about 1/7 of the unresolved CXB. We placed an upper limit to the space density of postulated X-ray-emitting early black hole at z>7.5 and compared it with SMBH evolution models.

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