An XMM-Newton view of the serendipitous sources in the PKS0312-770 field

Free access article

Issue		A&A Volume 376, Number 2, September II 2001


Page(s)		387 - 392
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20011015

A&A 376, 387-392 (2001)
DOI: 10.1051/0004-6361:20011015

An XMM-Newton view of the serendipitous sources in the PKS0312-770 field

D. H. Lumb¹, M. Guainazzi² and P. Gondoin¹

¹ XMM-Newton SOC, Space Science Dept., ESA, ESTEC, 2200AG Noordwijk, The Netherlands
² XMM-Newton SOC, Space Science Dept., ESA, Villafranca Satellite Tracking Station, 28080 Madrid, Spain

(Received 11 May 2001 / Accepted 5 July 2001 )

Abstract
We describe an XMM-Newton observation of the PKS0312-770 field, which facilitates the spectral analysis of serendipitous sources previously detected by CHANDRA. The combination of larger effective area and longer exposure duration allows a significant increase in detected photons, and a lower limit in source detection sensitivity. In particular the hard X-ray normal galaxy unveiled by Fiore et al. (2000) is most likely explained as a moderately absorbed ( $N_{\rm H} \sim 10^{22}$ cm^-2) AGN. We detect 52 sources (45 previously unreported) at a limiting flux of ~ $2\times 10^{-15}$ ergs cm^-2 s^-1 in the 0.5-2 keV band. The Log N-Log S curve is consistent with that derived from by XMM-Newton observations of the Lockman Hole field. The flux determinations allow to check for any inconsistency between the calibrations of the two observatories, which is discussed.

Offprint request: D. H. Lumb, dlumb@astro.estec.esa.nl

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