Distance estimate of M31 based on the size distribution of Hii regions and dark clouds |
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| Authors: | I A Issa |
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| Institution: | (1) Helwan Institute of Astronomy and Geophysics, Egypt;(2) Tokyo Astronomical Observatory, University of Tokyo, Japan |
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| 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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