Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.2056e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, June 1991, p. 2056-2077. Research supported by Margaret Cullinan Wray Charitabl
Astronomy and Astrophysics
Astronomy
27
Active Galactic Nuclei, Emission Spectra, Far Infrared Radiation, Hydrogen, Spiral Galaxies, Interstellar Gas, Markarian Galaxies, Star Formation, Statistical Analysis
Scientific paper
A sample of 252 S0 galaxies is used to study the relationship between H I content and far-IR emission. Logarithms of the H I content versus the far-IR emission are employed statistically to develop a best-fit linear regression line which is compared to a slope of approximately unity. The slopes are different for S0 and SB0 galaxies versus S0/a and SB0/a galaxies. The distribution of the 60-100 micron flux ratio is not significantly affected by the presence or absence of bars nor by the differences between the S0 and S0/a systems. The flux ratio is higher than the critical value of Helou in 34 percent of the cases, and the value holds when nuclear emission is taken into account. In cases where the critical value is exceeded, most far-IR emissions are expected to be due to star formation. S0 galaxies are generally found to have a normal ISM, except where the systems have accreted their H I gas. Systems with disproportionate FIR emission can be considered galaxies that are experiencing enhanced star formation or that have had their H I gas swept away.
Eskridge Paul B.
Pogge Richard W.
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