Size distributions of H II regions in galaxies. I - Irregular galaxies

Details Size distributions of H II regions in galaxies. I - Irregular galaxies Size distributions of H II regions in galaxies. I - Irregular galaxies

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88.1323h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 88, Sept. 1983, p. 1323-1329.

Astronomy and Astrophysics

Astronomy

45

Galactic Structure, H Ii Regions, Size Distribution, Astrometry, Astronomical Photography, Exponential Functions, H Alpha Line, Luminosity

Scientific paper

The size distributions for the H II regions of 18 irregular and related galaxies are determined from Hα plates. Almost without exception the integral diameter distribution fits an exponential law of the form previously deduced by van den Bergh (1981). The slopes are not correlated with observational or instrumental parameters, and are thus intrinsic to the galaxies. They show a strong correlation with galaxy luminosity in the sense that the less luminous galaxies have the steeper slopes. Six galaxies in the sample have significantly anomalous largest H II regions, a fact that suggests that giant H II regions are a separate class of objects that are formed by a different mechanism from that normally governing H II region sizes.

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