Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338l..53b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 338, March 15, 1989, p. L53-L56. Research supported by NASA.
Astronomy and Astrophysics
Astronomy
45
Continuous Radiation, Extragalactic Radio Sources, Galactic Structure, Infrared Sources (Astronomy), Spiral Galaxies, Cosmic Rays, Infrared Astronomy Satellite, Radio Emission
Scientific paper
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.
Bicay Michael D.
Condon James J.
Helou George
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