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IRAS observations of optically selected galaxies. I - The properties of the UGC redshift sample (1989)

Rice, Walter ; Bothun, Gregory D. ; Lonsdale, Carol J.

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Publication Date: 2011-08-19

Description: The FIR properties of more than 2400 optically selected galaxies in the Uppsala General Catalog are examined. The galaxies were detected by IRAS at 60 and 100 microns and have measured redshifts. A simple radiative transfer model is presented to study the nature of dust-heating sources. It is shown that for many normal disk galaxies, dust heated by old disk stars competes with dust heated by UV photons from newly formed stars. It is found that the 60-micron/100-micron flux density ratio may be used as an indicator of the dominant dust-heating source. Scaling relations with galaxy size and mass are presented which make it possible to estimate the contributions of any cirrus-like component to the total FIR luminosity.

Keywords: ASTROPHYSICS

Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 341; 129-150

Format: text

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