EDP Sciences
Free access
Volume 382, Number 2, February I 2002
Page(s) 522 - 536
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20011615

A&A 382, 522-536 (2002)
DOI: 10.1051/0004-6361:20011615

The XMM-Newton serendipitous survey

II. First results from the AXIS high galactic latitude medium sensitivity survey
X. Barcons1, F. J. Carrera1, M. G. Watson2, R. G. McMahon3, B. Aschenbach4, M. J. Freyberg4, K. Page2, M. J. Page5, T. P. Roberts2, M. J. L. Turner2, D. Barret6, H. Brunner7, M. T. Ceballos1, R. Della Ceca8, P. Guillout9, G. Hasinger4, 7, T. Maccacaro8, S. Mateos1, C. Motch9, I. Negueruela9, J. P. Osborne2, I. Pérez-Fournon10, A. Schwope7, P. Severgnini11, G. P. Szokoly7, N. A. Webb6, P. J. Wheatley2 and D. M. Worrall12

1  Instituto de Física de Cantabria (CSIC-UC), 39005 Santander, Spain
2  Department of Physics and Astronomy, University of Leicester, LE1 7RH, UK
3  Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
4  Max-Planck Institut für Extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany
5  Mullard Space Science Laboratory, UCL, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK
6  Centre d'Étude Spatiale des Rayonnements, 9 avenue du Colonel Roche, 31028 Toulouse Cedex 04, France
7  Astrophysikalishes Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
8  Osservatorio Astronomico di Brera, via Brera 28, 20121 Milano, Italy
9  Observatoire Astronomique de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France
10  Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
11  Dipartimento di Astronomia e Scienza dello Spazio, Università di Firenze, Largo E. Fermi 5, 50125 Firenze, Italy
12  Department of Physics, University of Bristol, Royal Fort, Tyndall Avenue, Bristol, BS8 1TL, UK

(Received 15 October 2001 / Accepted 7 November 2001 )

We present the first results on the identifications of a medium sensitivity survey (X-ray flux limit $2\times 10^{-14}\, {\rm
erg}\, {\rm cm}^{-2}\, {\rm s}^{-1}$ in the 0.5-4.5 keV band) at high galactic latitude ( ${{\mid}b{\mid}}>20^{\circ}$) carried out with the XMM-Newton X-ray observatory within the AXIS observing programme. This study is being conducted as part of the XMM-Newton Survey Science Centre activities towards the identification of the sources in the X-ray serendipitous sky survey. The sample contains 29 X-ray sources in a solid angle of $0.26\deg^2$ (source density $113\pm 21$ sources  $\deg^{-2}$), out of which 27 (93%) have been identified. The majority of the sources are broad-line AGN (19), followed by narrow emission line X-ray emitting galaxies (6, all of which turn out to be AGN), 1 nearby non-emission line galaxy ( NGC 4291 ) and 1 active coronal star. Among the identified sources we find 2 broad-absorption line QSOs ( $z\sim 1.8$ and $z\sim 1.9$), which constitute ~10% of the AGN population at this flux level, similar to optically selected samples. Identifications of a further 10 X-ray sources fainter than our survey limit are also presented.

Key words: X-rays: general, galaxies, stars -- galaxies: active

Offprint request: X. Barcons, barcons@ifca.unican.es

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© ESO 2002