| Issue |
A&A
Volume 373, Number 2, July II 2001
|
|
|---|---|---|
| Page(s) | 438 - 446 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20010595 | |
| Published online | 15 July 2001 | |
The X-ray view of M 33 after ROSAT*
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, 85748 Garching, Germany
Corresponding author: F. Haberl, fwh@mpe.mpg.de
Received:
28
February
2001
Accepted:
14
April
2001
We present a catalogue of 184 X-ray sources within 50´of the nucleus of the local group spiral galaxy M 33. The catalogue is derived from an analysis of the complete set of ROSAT archival data pointed in the direction of M 33 and contains X-ray position, existence likelihood, count rates and PSPC spectral hardness ratios. To identify the sources the catalog was correlated with previous X-ray catalogues, optical and radio catalogues. In addition sources were classified according to their X-ray properties. We find seven candidates for supersoft X-ray sources, of which two may be associated with known planetary nebulae in M 33. The majority of X-ray detected supernova remnants is also detected at radio frequencies and seen in optical lines. The low overall X-ray detection rate of optically selected SNRs can probably be attributed to their expansion into interstellar matter of low density.
Key words: galaxies: individual: Messier 33 / galaxies: stellar content / stars: variables: general / X-rays: stars / catalogs
© ESO, 2001
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