Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1279k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, Sept. 1984, p. 1279-1287.
Astronomy and Astrophysics
Astronomy
89
Astronomical Photometry, H Alpha Line, Spiral Galaxies, Star Clusters, Stellar Evolution, Cosmic Gases, Emission Spectra, Spectral Line Width, Star Formation Rate
Scientific paper
The authors have used large aperture Hα photometry of 65 spiral galaxies in the Cancer, Coma, and Abell 1367 clusters to compare the ionized-gas contents and star-formation rates in cluster and field spirals. Overall, the authors do not observe any significant deficiency of Hα emission in the cluster members. Emission strength correlates strongly with integrated galaxy colors, but only weakly with H I content. All three clusters contain several galaxies with unusually strong Hα emission, including several H I-poor objects in Coma and A1367. Thus, spirals which appear "anemic" in their morphology or exhibit weak Hα emission are not necessarily H I poor; conversely, H I poor spirals can show strong Hα emission, indicating relatively high current star-formation rates. Gas depletion time scales for some objects in the core of Coma are significantly shorter than the field, indicating rapid stellar and gaseous evolution.
Bothun Gragory D.
Kennicutt Robert C. Jr.
Schommer Robert A.
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