Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...177...63v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 177, no. 1-2, May 1987, p. 63-70.
Astronomy and Astrophysics
Astrophysics
44
Galactic Evolution, Hydrogen, Neutral Gases, Spiral Galaxies, Astronomical Maps, Interstellar Gas, Radial Velocity, Star Formation
Scientific paper
Neutral hydrogen synthesis maps and optical surface photometry are presented for two very red yet H I rich galaxies from the sample of Schommer and Bothun (1983), and for a red but unusually H I poor spiral in the Virgo cluster. Despite the very different integrated H I properties of these galaxies, they exhibit very similar average H I surface densities. The average H I surface densities are low compared to the average for galaxies of the same morphological type and H mass/B luminosity. This low surface density probably accounts for the anomalously low star formation rates, and hence red colors in these galaxies. This result indicates that spatially-resolved observations are needed to investigate the relationship between the gaseous contents and star formation in galaxies. The evolutionary history of the red H I rich galaxies, and their observed high mass-to-light ratios, remain difficult to explain unambiguously.
Bothun Gragory D.
Kennicutt Robert C.
Skillman Evan D.
van der Hulst J. M.
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