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Observation of X-Ray Emission from M31
Bowyer, Stuart; Margon, Bruce; Lampton, Michael; Cruddace, Ray
Astrophysical Journal, Vol. 190, pp. 285-290 (1974) (ApJ Homepage)
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We have observed X-ray emission from M31 in the 0.5-5.0 keV band, using rocket-borne proportional counters. The integrated flux corresponds to (2.2 l 0.6) x 1 0 ergs 1 at M3 1, and is confined chiefly to a region coinciding with the optical image of the galaxy. The spectrum has a slope similar to the bright Galactic X-ray sources. The intensity, spectral, and spatial data suggest that the bulk of X-ray emission from M3 1, and by inference from most normal galaxies, is due to a small group of highly luminous sources, in agreement with the Galactic X-ray luminosity function. Subject headings: galaxies, individual - spectra, X-ray - X-ray sources

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