Multiwavelength study of 230 IRAS FSC galaxies |
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Authors: | A Hovhannisyan L A Sargsyan A M Mickaelian D W Weedman |
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Institution: | (1) Astronomy 105-24, Caltech, Pasadena, Ca 91125, USA |
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Abstract: | A sample of 230 galaxies has been compiled based on their IRAS FSC fluxes to study their multiwavelength properties and carry
out comparative analyses with other similar samples. To understand the nature of these galaxies, a comparison with a sample
of bright ULIRGs having fluxes at 60 μm fν > 1 Jy and 14 optically faint IRAS FSC galaxies is presented. This comparison shows that galaxies found by IRAS are not always
strong infrared sources and that the objects from the sample of ULIRGs represent a sample of extreme galaxies, which are very
powerful infrared sources. We have confirmed the consistency between Star Formation Rates (SFRs) calibrated based on luminosities
of the PAH feature at 7.7 μm and radio 1.4 GHz flux densities. We have estimated the extinction for our 230 objects using
SFRs calibrated from the PAH feature compared to ultraviolet flux, which shows that only 1% of the ultraviolet continuum typically
escapes extinction by dust within a starburst. |
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