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Paper: X-ray Source Counts in the XMM-COSMOS Survey
Volume: 380, At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys
Page: 171
Authors: Cappelluti, N.; Hasinger, G.; Brusa, M.; Comastri, A.; Zamorani, G.; Boehringer, H.; Brunner, H.; Civano, F.; Finoguenov, A.; Fiore, F.; Gilli, R.; Griffiths, R.E.; Mainieri, V.; Matute, I.; Miyaji, T.; Silverman, J.
Abstract: We present the analysis of the source counts in the XMM-COSMOS survey using data of the first year of XMM-Newton observations. The survey covers ∼2 deg2 within the region of sky bounded by 9h57.5m < R.A. < 10h03.5m; 1d27.5m < DEC < 2d57.5m with a total net integration time of 504 ks. Using a maximum likelihood algorithm we detected a total of 1390 sources in at least one band. Using Monte Carlo simulations to estimate the sky coverage we produced the logN-logS relations. These relations have been then derived in the 0.52 keV, 210 keV and 510 keV energy bands, down to flux limits of 7.210−16 erg cm−2 s−1, 4.010−15 erg cm−2 s−1 and 9.710−15 erg cm−2 s−1, respectively. These relations have been compared to previous X-ray surveys and to the most recent X-ray background model finding an excellent agreement. The slightly different normalizations observed in the source counts of COSMOS and previous surveys can be largely explained as a combination of low counting statistics and cosmic variance introduced by the large scale structure.
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