A quantitative measure of orderly star formation in spiral galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Spatial Distribution, Spiral Galaxies, Star Formation, Galactic Structure, H Ii Regions, Visible Spectrum

Scientific paper

The positions of H II regions in spiral galaxies are an indicator of the recent loci of star-formation events. Analysis of these positions shows that the variance of their separations is a useful index of their degree of orderliness. For galaxies with well-organized arms, the ratio of the variance to the mean is large, while for galaxies without clearly-defined arms the ratio is close to the value for a random distribution of points. Values are given for ten galaxies for which sufficiently large numbers of measured H II region positions are available. For some cases the variation of the variance with radius is illustrated.

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