Volume 501, Number 1, July I 2009
|Page(s)||103 - 118|
|Published online||29 April 2009|
A deep XMM-Newton serendipitous survey of a middle-latitude area
II. New deeper X-ray and optical observations
INAF-IASF, Istituto di Astrofisica Spaziale e Fisica Cosmica “G.Occhialini”, via Bassini 15, 20133 Milano, Italy e-mail: email@example.com
2 Università di Pavia, Dipartimento di Fisica Teorica e Nucleare, via Ugo Bassi 6, 27100 Pavia, Italy
3 Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, RH56NT, Dorking, UK
4 European Southern Observatory, Karl Schwarzschild Str.2, 85748 Garching, Germany
5 Isaac Newton Group of Telescopes, Apartado de correos 321, 38700 Santa Cruz de La Palma Tenerife, Spain
6 Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany
7 IUSS – Istituto Universitario di Studi Superiori, Viale Lungo Ticino Sforza 56, 27100 Pavia, Italy
Accepted: 21 March 2009
Context. The radio-quiet neutron star 1E1207.4-5209 has been the target of several XMM-Newton observations, with a total exposure of ~350 ks. The source is located at intermediate galactic latitude (), i.e. in a sky region with an extremely interesting mix of both galactic and extra-galactic X-ray sources.
Aims. The aim of our work is to investigate the properties of both the intermediate-latitude galactic and extra-galactic X-ray source populations in the 1E1207.4-5209 field.
Methods. We performed a coherent analysis of the whole XMM-Newton observation data set to build a catalogue of serendipitous X-ray sources detected with high confidence and to derive information on the source flux, spectra, and time variability. In addition, we performed a complete multi-band (UBVRI) optical coverage of the field with the Wide Field Imager (WFI) of the ESO/MPG 2.2 m telescope (La Silla) to search for candidate optical counterparts to the X-ray sources, down to a V-band limiting magnitude of ~24.5.
Results. From the combined observation data set we detected a total of 144 serendipitous X-ray sources. We find evidence that the source distribution may be different from those computed either in the Galactic plane or at high galactic latitudes. Thanks to the refined X-ray positions and to the WFI observations, we found candidate optical counterparts for most of the X-ray sources in our compilation. For most of the brightest ones we proposed a likely classification based on both the X-ray spectra and the optical colours.
Conclusions. Our results indicate that at intermediate galactic latitude the X-ray source population is dominated by the extra-galactic component, but with a significant contribution from the galactic component in the soft energy band, below 2 keV.
Key words: galaxies: Seyfert / X-rays: general
© ESO, 2009
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