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High-resolution X-ray observations of the central region of M31 with the ROSAT satellite
Primini, F. A.; Forman, W.; Jones, C.
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 410, no. 2, p. 615-625. (ApJ Homepage)
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NASA/STI Keywords:
Andromeda Galaxy, Galactic Nuclei, Rosat Mission, Spaceborne Astronomy, X Ray Astronomy, X Ray Sources, Diffuse Radiation, Emission Spectra, Galactic Bulge, Point Sources, Spatial Distribution, Supernova Remnants
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A 48,000-sec observation of M31's central 34 arcmin, using the Rosat HRI, has led to the detection of 86 X-ray sources with luminosities above 1.4 x 10 exp 36 ergs/sec; of these, 18 sources are identified with globular clusters and two with SNRs. An extrapolation of the cumulative luminosity distribution to fainter luminosities indicates that only about 15-26 percent of the diffuse X-ray emission in the bulge is attributable to faint unresolved sources from this distribution. The spatial distribution and number density of X-ray sources in M31 appear to be very different from those of our Galaxy.

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