Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...398l..33w&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 398, no. 1, p. L33-L36.
Astronomy and Astrophysics
Astronomy
10
Far Infrared Radiation, Infrared Sources (Astronomy), Radio Galaxies, Starburst Galaxies, Carbon Monoxide, Luminosity, Radio Emission, Star Formation
Scientific paper
The linear size distribution of 218 galaxies in the IRAS infrared bright galaxy sample is studied by examining new measurements of the 1.49 Hz radio continuum emitting regions. We find that the radio surface brightness varies over a wide range at a given luminosity, but its median scales approximately as luminosity to the power of 6/5. Consequently, the median effective radio size of galaxies in a given luminosity range actually decreases with increasing luminosity, especially among galaxies with LFIR greater than 10 exp 11 solar luminosities. The close correlation between FIR and radio fluxes of these star-forming galaxies then leads to a picture contrary to earlier theoretical predictions that the sizes of FIR emitting regions should increase with luminosity. We propose that such a steep increase of surface brightness in luminous galaxies is a direct result of a high interstellar medium density and an enhanced radiation density of the heating photons driven by more active star formation.
Helou George
Wang Zhong
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