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, firstname.lastname@example.org
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.