The radial distribution of H II regions in spiral galaxies

Details The radial distribution of H II regions in spiral galaxies The radial distribution of H II regions in spiral galaxies

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267..563h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 267, April 15, 1983, p. 563-570.

Astronomy and Astrophysics

Astrophysics

71

Galactic Structure, H Ii Regions, Nebulae, Radial Distribution, Spiral Galaxies, Astronomical Photometry, Spatial Distribution

Scientific paper

We have examined the radial distribution of H II regions in the rectified planes of 37 galaxies. They group themselves into three broad classes: those with continually decreasing density outward, those with oscillating density, and those with doughnut-shaped density distributions. Generally, the second class is made up largely of SB galaxies, and the last is mostly populated by early Hubble types. A correlation is also found with absolute magnitude, which increases along the sequence given above. Most galaxies' outer H II region distributions show an exponential decrease in density, with a slope that is strongly correlated with Hubble type and absolute magnitude. We also find a correlation between Hubble type and the size of H II region density fluctuations, in the sense that later Hubble types show smaller differences in H II region density.

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