Evolutionary synthesis of the radio and far infrared emission in starbursts

Details Evolutionary synthesis of the radio and far infrared emission in starbursts Evolutionary synthesis of the radio and far infrared emission in starbursts

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9220464m&link_type=abstract

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Computer Science

Dwarf Galaxies, Emission Spectra, Far Infrared Radiation, H Ii Regions, Radio Waves, Spiral Galaxies, Indexes (Ratios), Magellanic Clouds, Star Formation Rate, Starburst Galaxies, Stellar Evolution, Stellar Luminosity

Scientific paper

The correletion between the radio and far infrared luminosities in a sample of 230 objects with active star formation (H II regions, blue compact galaxies, and spiral galaxies) were reanalyzed. The correlation extends to the low luminosity end, holding over more than 7 decades. The dispersion in the ratio (R) between radio and far infrared emission is always within a factor 4, but different classes of objects show significant differences in R, which is lowest for H II regions and highest for interacting spirals and Blue Compact Dwarf Galaxies (BCDG's). Simple evolutionary synthesis models can reproduce generally well the observed values of R and of the radio spectral index. The thermal radio excess found in LMC (Lower Magellanic Cloud) H II regions and BCDG's suggests that the ionizing flux emitted by a metal deficient cluster of young massive stars is significantly higher than at solar metallicities. In spiral galaxies, it is assumed that the nonthermal radio emission is between one and two orders of magnitude higher than the emission expected from single isolated supernova remnants, indicating that supernova explosions would have to inject a larger amount of energy to cosmic rays electrons than previously thought.

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