Abstract
The size distribution of dark clouds and of H II regions were used to derive a distance of 440±22 kpc for M31. Some galactic H II regions and dark clouds were combined with the same ingredients in M31 to study the mass spectrum of both phenomena. A gas to dust ratio of 1000∶1 has been derived for M31. Radii of the classical H II regions as derived in this work using distance of 440 kpc agrees with the galactic classical H II region radii.
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Issa, I.A. Distance estimate of M31 based on the size distribution of Hii regions and dark clouds. Astrophys Space Sci 113, 317–323 (1985). https://doi.org/10.1007/BF00650966
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DOI: https://doi.org/10.1007/BF00650966