Volume 373, Number 1, July I 2001
|Page(s)||63 - 99|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 July 2001|
The second ROSAT PSPC survey of M 31 and the complete ROSAT PSPC source list *
Max-Planck-Institut für extraterrestrische Physik, Postfach 1603, 85740 Garching, Germany
2 Astrophysikalisches Institut, An der Sternwarte 16, 14482 Potsdam, Germany
3 CSR and Department of Physics, Massachusetts Institute of Technology, Room 37-627, Cambridge, MA 02139, USA
4 Canada-France-Hawaii Telescope, 65-1238 Mamalahoa Hwy, Kamuela, HI 96743, USA
5 Astronomical Institute "Anton Pannekoek" , University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
6 Physics Department, University of Alabama in Huntsville, Huntsville, AL 35899, USA
Corresponding author: R. Supper, email@example.com
Accepted: 2 April 2001
This paper reports the results of the analysis of the second ROSAT PSPC survey of M 31 performed in summer 1992. We compare our results with those of the first survey, already published in Supper et al.([CITE]). Within the ~ field of view, 396 individual X-ray sources are detected in the second survey data, of which 164 are new detections. When combined with the first survey, this result in a total of 560 X-ray sources in the field of M 31. Their (0.1 keV-2.0 keV) fluxes range from to , and of these 560 sources, 55 are tentatively identified with foreground stars, 33 with globular clusters, 16 with supernova remnants, and 10 with radio sources and galaxies (including M 32). A comparison with the results of the Einstein M 31 survey reveals 491 newly detected sources, 11 long term variable sources, and 7 possible transient sources. Comparing the two ROSAT surveys, we come up with 34 long term variable sources and 8 transient candidates. For the M 31 sources, the observed luminosities range from to . The total (0.1 keV-2.0 keV) luminosity of M 31 is , distributed approximately equally between the bulge and disk. Within the bulge region, the luminosity of a possible diffuse component combined with faint sources below the detection threshold is . An explanation in terms of hot gaseous emission leads to a maximum total gas mass of .
Key words: galaxies: fundamental parameters / galaxies: individual: M 31 / galaxies: spiral / X-rays: galaxies
© ESO, 2001
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