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XMM-Newton observation of the lockman hole. I. The X-ray data

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journal contribution
posted on 24.10.2012, 09:22 by G. Hasinger, H. Brunner, Y. Hashimoto, G. P. Szokoly, B. Altieri, N. Scharte, M. Arnaud, P. Ferrando, X. Barcons, S. Mateos, J. Bergeron, M. Dadina, K. Dennerl, A. Finoguenov, J. Trümper, R. E. Griffiths, T. Miyaji, A. F. Ptak, F. A. Jansen, D. H. Lumb, K. O. Mason, M. J. Page, R. G. McMahon, F. Paerels, T. P. Sasseen, M. Turner, R. S. Warwick, M. G. Watson
We report on the first deep X-ray survey with the XMM-Newton observatory during the performance verification phase. The field of the Lockman Hole, one of the best studied sky areas over a very wide range of wavelengths, has been observed. A total of $\sim$100 ksec good exposure time has been accumulated. Combining the images of the European Photon Imaging Camera (EPIC) detectors we reach a flux limit of 0.31, 1.4 and $2.4 10^{-15} {\rm erg} {\rm cm}^{-2} {\rm s}^{-1}$, respectively in the 0.5-2, 2-10, and 5-10 keV band. Within an off-axis angle of 10 arcmin we detect 148, 112 and 61 sources, respectively. The log(N)-log(S) relation in the three bands is compared with previous results. In particular in the 5-10 keV band these observations present the deepest X-ray survey ever, about a factor 20 more sensitive than the previous BeppoSAX observations. Using X-ray spectral diagnostics and the set of previously known, spectroscopically identified ROSAT sources in the field, the new sources can be classified. XMM-Newton detects a significant number ($\sim$40% ) of X-ray sources with hard, probably intrinsically absorbed X-ray spectra, confirming a prediction of the population synthesis models for the X-ray background.



Astronomy & Astrophysics, 2001, 365 (1)


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