| Authors | Cappelluti, N.; Brusa, M.; Hasinger, G.; Comastri, A.; Zamorani, G.; Finoguenov, A.; Gilli, R.; Puccetti, S.; Miyaji, T.; Salvato, M.; Vignali, C.; Aldcroft, T.; Böhringer, H.; Brunner, H.; Civano, F.; Elvis, M.; Fiore, F.; Fruscione, A.; Griffiths, R. E.; Guzzo, L.; Iovino, A.; Koekemoer, A. M.; Mainieri, V.; Scoville, N. Z.; Shopbell, P.; Silverman, J.; Urry, C. M. |
| Abstract | 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 deg2 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 deg2.
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 deg2) 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> 1042 erg/s) although they do not show any clear signature of nuclear activity in the optical spectrum. Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institut National des Sciences de l'Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at TERAPIX. Full Table [see full text] is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/497/635 |
