A statistical analysis of the Einstein normal galaxy sample. I - Spiral and irregular galaxies

Details A statistical analysis of the Einstein normal galaxy sample. I - Spiral and irregular galaxies A statistical analysis of the Einstein normal galaxy sample. I - Spiral and irregular galaxies

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...296..430f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 296, Sept. 15, 1985, p. 430-457.

Astronomy and Astrophysics

Astrophysics

86

Irregular Galaxies, Spiral Galaxies, Statistical Analysis, X Ray Sources, Astronomical Observatories, Galactic Nuclei, Samples, Star Distribution

Scientific paper

The results of a statistical analysis of 48 spiral and irregular galaxies observed with the Einstein Observatory are reported. It is found that the X-ray luminosity is not directly correlated with the mass of the galaxies, but is strongly correlated with the blue luminosity. This suggests that most X-ray sources, including low-mass binaries, are binary systems belonging to both old disk and young arm Population I components. A real bulge population of X-ray sources exists that can contribute significantly to the X-ray luminosity of early-type spirals. The X-ray emission from a sample of 29 relatively isolated, normal elliptical and S0 galaxies is also studied, and the results are compared to those for the above sample to investigate the origin of the X-ray emission in early-type galaxies and the possible emission mechanisms. The influence of a powerful radio source and the onset of nuclear activity are also examined.

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