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Title: XMM-Newton observation of the lockman hole. I. The X-ray data
Authors: Hasinger, G.
Brunner, H.
Hashimoto, Y.
Szokoly, G. P.
Altieri, B.
Scharte, N.
Arnaud, M.
Ferrando, P.
Barcons, X.
Mateos, S.
Bergeron, J.
Dadina, M.
Dennerl, K.
Finoguenov, A.
Trümper, J.
Griffiths, R. E.
Miyaji, T.
Ptak, A. F.
Jansen, F. A.
Lumb, D. H.
Mason, K. O.
Page, M. J.
McMahon, R. G.
Paerels, F.
Sasseen, T. P.
Turner, M.
Warwick, R. S.
Watson, M. G.
First Published: Jan-2001
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2001, 365 (1)
Abstract: 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.
DOI Link: 10.1051/0004-6361:20000046
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2001 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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