The spatial distribution of H II regions in NGC 4321

Details The spatial distribution of H II regions in NGC 4321 The spatial distribution of H II regions in NGC 4321

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..132a&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 132-139.

Astronomy and Astrophysics

Astrophysics

21

Astronomical Models, Galactic Structure, H Ii Regions, Spatial Distribution, Spiral Galaxies, Virgo Galactic Cluster, Astronomical Photography, Density Wave Model, H Alpha Line, Radial Distribution

Scientific paper

A catalog of 286 H II regions in the giant Sc Virgo Cluster spiral galaxy NGC 4321 is used to analyze some aspects of this galaxy's spiral structure. The H II region distribution is rectified to face-on by least-squares fitting to a logarithmic spiral, and the radial distribution, the across-arm distribution, and the along-arm distribution of H II regions are determined. Comparison of the circular distribution with a simple shock wave model of the density wave theory does not clearly support the model. Arm 1 shows no obvious structure, and arm 2, although it has a clear peak, does not show the expected asymmetrical distribution. Agreement is reasonably good, however, with the somewhat more elaborate density wave model of Bash. Tests for clumping of the H II regions were negative.

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