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Title:
The infrared-to-radio ratio within NGC 5236 (M83) and NGC 6946
Authors:
Bicay, M. D.; Helou, G.; Condon, J. J.
Affiliation:
AA(California Institute of Technology, Pasadena), AB(California Institute of Technology, Pasadena), AC(National Radio Astronomy Observatory, Charlottesville, VA)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 338, March 15, 1989, p. L53-L56. Research supported by NASA. (ApJL Homepage)
Publication Date:
03/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Continuous Radiation, Extragalactic Radio Sources, Galactic Structure, Infrared Sources (Astronomy), Spiral Galaxies, Cosmic Rays, Infrared Astronomy Satellite, Radio Emission
DOI:
10.1086/185399
Bibliographic Code:
1989ApJ...338L..53B

Abstract

A detailed comparison of the distribution of 60-micron IR and 20-cm radio continuum emission within NGC 5236 (M83) and NGC 6946 is presented. In the disks of both galaxies, a slow decrease of the 60-micron-to-20-cm ratio with increasing radius is observed. Values of this ratio within the central regions are enhanced by roughly a factor of 3 with respect to the outer disks, whereas the corresponding enhancement in radio surface brightness is at least a factor of 20. The 100-micron-to-20-cm ratio shows a similar but shallower gradient. To account for these observations, it is suggested that spiral galaxies are characterized by an IR disk with a shorter scale length than that of the radio continuum disk, the latter being smeared as a result of cosmic-ray propagation.

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