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We analyze the 2-10 keV luminosity distribution of 36 X-ray sources in the Local Group having known or estimated distances and find that there exists a luminosity cutoff of approximately 10 ergs 1 in agreement with the theoretical (Eddington) limit for the luminosity of an approximately 1 M0 star. Furthermore, among the complete sample of high-luminosity sources, there appears to be a statistically significant group of X-ray "standard candles" at (within < 0.8 mag) the critical luminosity. This finding (which is in agreement with the self-consistent mass flow accretion models) presents the possibility that X-ray sources may be used as extragalactic distance indicators in the next generation of X-ray astronomy experiments. Subject headings: luminosities - X-ray sources
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Margon et al. (1973) studied this question.
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