Volume 365, Number 1, January 2001
First Results from XMM-Newton
|Page(s)||L45 - L50|
|Published online||15 January 2001|
XMM-Newton observation of the Lockman Hole*
I. The X-ray data
Astrophysikalisches Institut Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany
2 Operations Centre, European Space Agency, Vilspa, Apartado 50727, 28080 Madrid, Spain
3 CEA/DSM/DAPNIA/Service d'Astrophysique, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France
4 Instituto de Fisica (Consejo Superior de Investigaciones Cientificas-Universidad de Cantabria), 39005 Santander, Spain
5 European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, Germany
6 TeSRE-CNR, Via Gobetti 101, 40129 Bologna, Italy
7 Max-Planck-Institut für extraterrestrische Physik, 85740 Garching, Germany
8 Department of Physics, Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh, PA 15213, USA
9 Space Science Dept., European Space Agency, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
10 MSSL, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK
11 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
12 Columbia Astrophysics Laboratory, Columbia University, 538 West 120th Street, New York, NY 10027, USA
13 Department of Physics, University of California at Santa Barbara, Santa Barbara, CA 93110, USA
14 X-ray Astronomy Group, Department of Physics and Astronomy, Leicester University, Leicester LE1 7RH, UK
Corresponding author: G. Hasinger, firstname.lastname@example.org
Accepted: 24 October 2000
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 ~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 , 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 (~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.
Key words: surveys / galaxies: active / galaxies: quasars: general / Cosmology: diffuse radiation / X-ray: galaxies / X-rays: general
© ESO, 2001
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