Einstein X-ray observations of M101

Details Einstein X-ray observations of M101 Einstein X-ray observations of M101

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356..110t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 10, 1990, p. 110-118. Research supported by ASI.

Astronomy and Astrophysics

Astrophysics

26

Galactic Radiation, Spiral Galaxies, X Ray Sources, Brightness Distribution, Heao 2, Luminosity, Proportional Counters

Scientific paper

The Einstein X-ray observations of the face-on spiral galaxy M101 are presented. The global X-ray luminosity L(x) of M101 is about 1.2 x 10 to the 40th ergs/s for D = 7.2 Mpc, consistent with the expected X-ray luminosity of normal spiral galaxies of its optical magnitude. The X-ray emission is mostly due to very luminous individual sources, with L(x) greater than 10 to the 38th ergs/s each, most likely very massive accreting binary systems. The data suggest a deficiency of sources in the luminosity range of L(x) from about 10 to the 37th to about 10 to the 38th ergs/s, which would indicate that the luminosity distribution of the X-ray sources in M101 might be different from that of M31 or M33.

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