| Issue |
A&A
Volume 373, Number 1, July I 2001
|
|
|---|---|---|
| Page(s) | 63 - 99 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20010495 | |
| Published online | 15 July 2001 | |
The second ROSAT PSPC survey of M 31 and the complete ROSAT PSPC source list *
1
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, ros@mpe.mpg.de
Received:
6
February
2001
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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