Abstract
view Abstract Citations (21) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The spatial distribution of HII regions in NGC 4321. Anderson, S. ; Hodge, P. ; Kennicutt, R. C., Jr. Abstract 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. Publication: The Astrophysical Journal Pub Date: February 1983 DOI: 10.1086/160658 Bibcode: 1983ApJ...265..132A Keywords: Astronomical Models; Galactic Structure; H Ii Regions; Spatial Distribution; Spiral Galaxies; Virgo Galactic Cluster; Astronomical Photography; Density Wave Model; H Alpha Line; Radial Distribution; Astrophysics full text sources ADS | data products SIMBAD (1) NED (1)
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