Observations of X-ray sources in M31

Details Observations of X-ray sources in M31 Observations of X-ray sources in M31

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234l..45v&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 234, Nov. 15, 1979, p. L45-L49.

Astronomy and Astrophysics

Astrophysics

103

Andromeda Galaxy, Globular Clusters, X Ray Sources, Astrophysics, Galactic Nuclei, Luminosity

Scientific paper

Sixty-nine unresolved X-ray sources and seven diffuse or confused source regions have been observed in M31 with the Einstein Observatory. The typical limiting sensitivities in the 0.5-4.5 keV band were 9 x 10 to the 36th ergs/s. There are 21 sources in a compact inner bulge, seven globular clusters, 40 sources categorized as Population I, and 8 sources near globular clusters but with position errors large enough so that four chance coincidences would be expected. The Population I sources are associated with bright visible objects, and with neutral hydrogen, dust, and other Population I tracers. Luminosity distributions of these classes are given. The nucleus of M31 is coincident with a 10 to the 38th ergs/s X-ray source at approximately the 90% confidence level.

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