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Published September 2007 | Published
Journal Article Open

The XMM-Newton Wide-Field Survey in the COSMOS Field. I. Survey Description


We present the first set of XMM-Newton EPIC observations in the 2 deg^2 COSMOS field. The strength of the COSMOS project is the unprecedented combination of a large solid angle and sensitivity over the whole multiwavelength spectrum. The XMM-Newton observations are very efficient in localizing and identifying active galactic nuclei (AGNs) and clusters, as well as groups of galaxies. One of the primary goals of the XMM-Newton Cosmos survey is to study the coevolution of active galactic nuclei as a function of their environment in the cosmic web. Here we present the log of observations, images, and a summary of first research highlights for the first pass of 25 XMM-Newton pointings across the field. In the existing data set we have detected 1416 new X-ray sources in the 0.5-2, 2-4.5, and 4.5-10 keV bands to an equivalent 0.5-2 keV flux limit of 7 × 10^(-16) erg cm^(-2) s^(-1). The number of sources is expected to grow to almost 2000 in the final coverage of the survey. From an X-ray color-color analysis we identify a population of heavily obscured, partially leaky or reflecting absorbers, most of which are likely to be nearby, Compton-thick AGNs.

Additional Information

© 2007 American Astronomical Society. Received 2006 April 24; accepted 2006 September 28. This work is based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and the US (NASA). In Germany, the XMM-Newton project is supported by the Bundesministerium fur Bildung und Forschung/Deutsches Zentrum fur Luft und Raumfahrt, and the Max-Planck Society. Part of this work was supported by the Deutsches Zentrum fur Luft- und Raumfahrt, DLR project numbers 50 OR 0207 and 50 OR 0405. We gratefully acknowledge the contributions of the entire COSMOS collaboration consisting of more than 100 scientists. More information on the COSMOS survey is available at http://www.astro.caltech.edu /cosmos. This research has made use of the NASA/IPAC Extragalactic Database (NED) and the SDSS spectral archive. We thank Guinevere Kauffmann and Jarle Brinchmann for help with the object No. 2608. We acknowledge helpful comments from an anonymous referee.

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