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: firstname.lastname@example.org
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.