Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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FREQUENCY DISTRIBUTION OF HII REGIONS RADII AS A DISTANCE INDICATOR

  • ISMAIL H. A. (Astronomy Dept., National Research Institute of Astronomy and Geophysics) ;
  • ALAWY A. E. (Astronomy Dept., National Research Institute of Astronomy and Geophysics) ;
  • TAKEY A. S. (Astronomy Dept., National Research Institute of Astronomy and Geophysics) ;
  • ISSA I. A. (Astronomy Dept., National Research Institute of Astronomy and Geophysics) ;
  • SELIM H. H. (Astronomy Dept., National Research Institute of Astronomy and Geophysics)
  • Published : 2005.03.01
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Abstract

The frequency distribution of HII regions radii in our galaxy has been investigated. The correlation between the number of these regions and their radii has been re-determined, and could be represented by an exponential function. The size distribution of the HII regions in 10 spiral galaxies has been derived and combined with that of our galaxy to derive the distances of these galaxies. It has been found that the distances derived are in a good agreement with the published ones. The interstellar extinction in the galaxies has no influence on the distance estimate when using this geometrical method.

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References

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