Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26as...83..211c&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 83, no. 2, May 1990, p. 211-223.
Astronomy and Astrophysics
Astrophysics
38
H Ii Regions, Luminosity, Spatial Distribution, Spiral Galaxies, Charge Coupled Devices, Electron Density (Concentration), Emission Spectra, H Alpha Line, Telescopes
Scientific paper
From H-alpha CCD observations taken with the 4.2-m William Herschel Telescope, a catalog of 456 H II regions of the inner zone of the spiral galaxy NGC 4321 has been compiled. The radial distribution, the distribution of diameters, and the luminosity function for the arm and the interarm H II regions are presented, together with the spatial dependence of the product of the filling factor and the electron density of the H II regions. Newly discovered H-alpha emission features are shown surrounding the nuclear zone, which itself seems to be an H-alpha emitter.
Beckman John E.
Cepa Jordi
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