Astron. Astrophys. Suppl. Ser. 147, 75-91
ROSAT HRI catalogue of X-ray sources in the SMC region
M. Sasaki, F. Haberl, and W. Pietsch
Send offprint request: M. Sasaki;
Max-Planck-Institut für extraterrestrische Physik,
Giessenbachstraße, 85748 Garching, Germany
Received March 24; accepted August 22, 2000
During the operational phase of the ROSAT satellite between 1990 and
1998 the X-ray telescope pointed 71 times to the Small Magellanic
Cloud (SMC) for observations with the High Resolution Imager
(HRI), covering a field of 5
From these data a
catalogue of 121 discrete X-ray sources was derived. By
cross-correlating the source catalogue with the SIMBAD data base and
the TYCHO catalogue, the systematic positional error of the HRI source
positions could be reduced. In total the X-ray position for 99 HRI
sources was corrected yielding positional errors between 1
The HRI catalogue was also cross-correlated with the catalogues derived
from the ROSAT Position Sensitive Propotional Counter (PSPC) pointings
(Kahabka et al. 1999; Haberl et al. 2000). For 75 HRI sources PSPC
counterparts were found and thus hardness ratios are given.
With the help of the information obtained from the
cross-correlations 56 HRI sources were identified with
objects of known or proposed nature.
Four foreground stars, six supernova remnants, four supersoft sources,
12 X-ray binaries, and one AGN were detected by the HRI.
Based on the existence of a likely optical counterpart
or properties like hardness ratio and X-ray to optical flux ratio,
further 15 HRI sources were classified into different source types.
Key words: catalogs -- galaxies: magellanic clouds --
galaxies: stellar content --
X-rays: galaxies -- X-rays: stars
Copyright The European Southern Observatory (ESO)