1. The nature of the unresolved extragalactic soft CXB
- Author
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Cappelluti, N., Ranalli, P., Roncarelli, M., Arevalo, P., Comastri, G. Zamorani A., Gilli, R., Rovilos, E., Vignali, C., Allevato, V., Finoguenov, A., Miyaji, T., Nicastro, F., Georgantopoulos, I., and Kashlinsky, A.
- Subjects
Astrophysics - Cosmology and Extragalactic Astrophysics ,Astrophysics - Galaxy Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
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
7.5 and compared it with SMBH evolution models., Comment: 15 pages, 9 figures, accepted by MNRAS - Published
- 2012
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