Cappelluti, N. and Brusa, M. and Hasinger, G. and Comastri, A. and Zamorani, G. and Finoguenov, A. and Gilli, R. and Puccetti, S. and Miyaji, T. and Salvato, M. and Vignali, C. and Aldcroft, T. and Böhringer, H. and Brunner, H. and Civano, F. and Elvis, M. and Fiore, F. and Fruscione, A. and Griffiths, R. E. and Guzzo, L. and Iovino, A. and Koekemoer, A. M. and Mainieri, V. and Scoville, N. Z. and Shopbell, P. and Silverman, J. and Urry, M. (2009) The XMM-Newton wide-field survey in the COSMOS field - The point-like X-ray source catalogue. Astronomy and Astrophysics, 497 (2). pp. 635-648. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20090812-132642949
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Context. The COSMOS survey is a multiwavelength survey aimed to study the evolution of galaxies, AGN and large scale structures. Within this survey XMM-COSMOS a powerful tool to detect AGN and galaxy clusters. The XMM-COSMOS is a deep X-ray survey over the full 2 deg^2 of the COSMOS area. It consists of 55 XMM-Newton pointings for a total exposure of ~1.5 Ms with an average vignetting-corrected depth of 40 ks across the field of view and a sky coverage of 2.13 deg^2. Aims. We present the catalogue of point-like X-ray sources detected with the EPIC CCD cameras, the log N − log S relations and the X-ray colour–colour diagrams. Methods. The analysis was performed using the XMM-SAS data analysis package in the 0.5–2 keV, 2–10 keV and 5–10 keV energy bands. Source detection has been performed using a maximum likelihood technique especially designed for raster scan surveys. The completeness of the catalogue as well as log N − log S and source density maps have been calibrated using Monte Carlo simulations. Results. The catalogs contains a total of 1887 unique sources detected in at least one band with likelihood parameter det_ml > 10. The survey, which shows unprecedented homogeneity, has a flux limit of ~1.7×10^(−15) erg cm^(−2) s^(−1), ~9.3×10^(−15) erg cm^(−2) s^(−1) and ~1.3×10^(−14) erg cm^(−2) s^(−1) over 90% of the area (1.92 deg^2) in the 0.5–2 keV, 2–10 keV and 5–10 keV energy band, respectively. Thanks to the rather homogeneous exposure over a large area, the derived log N − log S relations are very well determined over the flux range sampled by XMM-COSMOS. These relations have been compared with XRB synthesis models, which reproduce the observations with an agreement of ~10% in the 5–10 keV and 2–10 keV band, while in the 0.5–2 keV band the agreement is of the order of ~20%. The hard X-ray colors confirmed that the majority of the extragalactic sources in a bright subsample are actually type I or type II AGN. About 20% of the sources have a X-ray luminosity typical of AGN (L_X > 10^(42) erg/s) although they do not show any clear signature of nuclear activity in the optical spectrum.
|Additional Information:||© ESO 2009. Received 13 August 2008. Accepted 14 January 2009.Part of this work was supported by the German Deutsche Forschungsgemeinschaft, DFG project number Ts 17/2–1.In Germany the XMM-Newton project is supported by the Bundesministerium für Wirtshaft und Techologie/Deutsches Zentrum für Luft und Raumfahrt and the Max-Planck society. N.C. and A.F. were partially supported from a NASA grant NNX07AV03G to UMBC. In Italy, the XMM-COSMOS project is supported by PRIN/MIUR under grant 2006-02-5203 and ASI-INAF grants I/023/05/00, I/088/06. Part of this work was supported by the German Deutsche Forschungsgemeinschaft,DFG Leibniz Prize (FKZ HA 1850/28-1). N.C. gratefully acknowledges Ezequiel Treister for providing his prediction of the XRB log N − log S. The entire COSMOS collaboration is gratefully acknowledged. N.C. acknowledges UNAM-Ensenada for the hospitality during his visit.|
|Subject Keywords:||galaxies: active large scale structure of Universe X rays: diffuse background X rays: galaxies|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||12 Aug 2009 22:13|
|Last Modified:||26 Dec 2012 11:11|
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