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The Radio-Infrared Correlation within Galaxies

  • George Helou
  • Michael D. Bicay
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 160)

Abstract

A comparison of the distributions of 60μm infrared and 20cm radio continuum emission within spiral galaxies reveals a broad correlation between the two, which is modulated by a slow decrease in the 60μm-to-20cm ratio with increasing radius. Using these results, we propose a physical model for understanding the tight correlation between far-infrared and non-thermal radio luminosities in star-forming galaxies. This approach suggests that the basic constraint implied by the correlation is a tight coupling between the sources of the dust-heating photons and those of cosmic-ray electrons. Among spiral galaxies, we require in addition a universal relation whereby magnetic field strength scales with gas density to a power l/3≤β≤2/3.

Keywords

Star Formation Spiral Galaxy Tight Coupling Disk Galaxy Star Formation Activity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • George Helou
    • 1
  • Michael D. Bicay
    • 1
  1. 1.Infrared Processing and Analysis Center and Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaUSA

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