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The 60 micron to 20 centimeter infrared-to-radio ratio within spiral galaxies
Bicay, M. D.; Helou, G.
AA(JPL; California Institute of Technology, Pasadena), AB(JPL; California Institute of Technology, Pasadena)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 362, Oct. 10, 1990, p. 59-73. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Disk Galaxies, Extragalactic Radio Sources, Infrared Photometry, Infrared Sources (Astronomy), Spiral Galaxies, Continuous Radiation, Far Infrared Radiation, Infrared Astronomy Satellite, Random Walk
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A detailed comparison is presented of the distribution of 60 micron IR and 20 cm radio continuum emission within 25 galaxies, mostly disk spirals. Local maxima in the thermal IR and nonthermal radio emission are found to be spatially coincident on scales of less than about 0.4 kpc in the nearest sample galaxies. The IR-red disk in normal spirals appears to be characterized by a shorter scale length than that of the radio continuum disk, suggesting that the IR-to-radio ratio should decrease as a function of radius. A model that successfully accounts for the observations is introduced which is based on the assumptions of steady-state star formation activity within the disk on kpc scales and a tight coupling between the origins of the dust-heating radiation and the radio-emitting cosmic-ray electrons. The underlying source is described as an exponential disk. The results also suggest that a random walk process cannot by itself describe the temporal evolution of cosmic rays.

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