A radio continuum survey of Shapley-Ames galaxies at λ2.8cm. III. The radio-far infrared correlation.

Details A radio continuum survey of Shapley-Ames galaxies at λ2.8cm. III. The radio-far infrared correlation. A radio continuum survey of Shapley-Ames galaxies at λ2.8cm. III. The radio-far infrared correlation.

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...322...29n&link_type=abstract

Astronomy and Astrophysics, v.322, p.29-37

Astronomy and Astrophysics

Astrophysics

20

Galaxies: Spiral, Infrared: Galaxies, Radio Continuum: Galaxies, Ism: Cosmic Rays

Scientific paper

Radio flux densities of Shapley-Ames galaxies at λ2.8cm from Niklas et al. (1995A&AS..114...21N, Paper I) and at λ20cm from Condon (1987ApJS...65..485C, C87) have been used to investigate the radio-far infrared (FIR) correlation at two different radio wavelengths. The correlation between monochromatic radio and the FIR luminosity was found to be non-linear (P_2.8cm_{prop.to}L_FIR_^1.09+/-0.04^ and P_20cm_{prop.to}L_FIR_^1.23+/-0.05^). Galaxies with Seyfert activity often exhibit enhanced radio emission compared to the FIR. Interacting and Starburst Galaxies do not show significant deviations from the correlation. For 74 galaxies with separated thermal and non-thermal radio emission the thermal radio luminosity was found to be proportional to the FIR luminosity. At both frequencies the non-thermal radio luminosity is non-linearly connected to the FIR luminosity (P_nth_{prop.to}L_FIR_^1.25+/-0.08^). From the ratio P_th_/L_FIR_ one can conclude that =~30% of the FIR emission can be attributed to dust associated with massive star-forming regions.

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