Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...147l...6d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 147, no. 1, June 1985, p. L6-L9.
Astronomy and Astrophysics
Astrophysics
257
Continuous Radiation, Far Infrared Radiation, Galactic Radiation, Radiant Flux Density, Radio Emission, Spiral Galaxies, Data Correlation, Nonthermal Radiation, Stellar Evolution
Scientific paper
Observations at 6.3 cm of a total of 91, mostly spiral, galaxies for which 60- and 100-micron densities had been published are the bases for a plotting of far-IR flux densities against radio ones which indicates that these quantities are closely correlated. This correlation has been further explored by plotting flux density ratio distributions for two sample galaxy subsets: optically and IR-bright nearby galaxies, and a complete IR subset of more distant galaxies. The radio/IR flux density ratio is the same for both subsets while the IR/blue flux density ratio differs by a factor of 3, implying that the relative intensity of the radio continuum and the far-IR emission is the same despite differences in present star formation activity. The predominantly nonthermal radio emission of spiral galaxies is therefore connected with the young stellar population.
de Jong Teije
Klein Ulf
Wielebinski Richard
Wunderlich E.
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