ROSAT X-ray sources in the field of the LMC. II. Statistics of background AGN and X-ray binaries
Abstract
About 200 X-ray sources from a sample of spectrally hard ROSAT PSPC sources, given in the catalog of Haberl & Pietsch (1999), and observed in a ~ 60 square degree field of the LMC during several archival pointed observations with a wide range of exposure times have been reanalyzed. For these sources accurate count rates and hardness ratios have been recalculated. In comparison to Haberl & Pietsch (1999) we used merged data from all available observations and we derived average source parameters by investigating each source individually. From a simulation powerlaw spectral tracks have been derived in the H R1 - H R2 plane and ~ 170 sources have been classified as background X-ray sources or as LMC X-ray binaries. 80% of the spectrally hard X-ray sources with more than 50 observed counts have been found to be consistent with background X-ray sources and 20% with LMC X-ray binaries (53 sources with AGN and 15 with X-ray binaries). The discovery of a new supersoft source RX J0529.4-6713 at the southern H I boundary of the supergiant shell LMC 4 is reported. We find two new candidate X-ray binary systems which are associated with the optical bar of the LMC and additional candidate X-ray binaries which are associated with supergiant shells. Tables 1 and 3 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http:/cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/388/100
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 2002
- DOI:
- 10.1051/0004-6361:20020480
- arXiv:
- arXiv:astro-ph/0204076
- Bibcode:
- 2002A&A...388..100K
- Keywords:
-
- galaxies: Magellanic Clouds;
- galaxies: individual: LMC;
- galaxies: active;
- galaxies: ISM;
- X-rays: galaxies;
- X-rays: stars;
- Astrophysics
- E-Print:
- 13 pages, accepted for publication in A&