NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T08:12:45 PDT
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For refcode 1997A&A...322...29N:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1997A&A...322...29N A radio continuum survey of Shapley-Ames galaxies at {lambda}2.8cm. III. The radio-far infrared correlation. Niklas S. Received 28 May 1996/Accepted 22 July 1996 Abstract. Radio flux densities of Shapley-Ames galaxies at {lambda}2.8cm from Niklas et al.(1995a, Paper I) and at {lambda}20cm from Condon (1987, 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_ is proportional to L_FIR_^1.09+/-0.04^ and P_20cm_ is proportional 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_ is proportional 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. Key words: galaxies: spiral - infrared: galaxies - radio continuum: galaxies - ISM: cosmic rays
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