An analysis of the FIR/RADIO continuum correlation in the small Magellanic cloud

Leverenz, Howard, and Filipovic, Miroslav D. (2013) An analysis of the FIR/RADIO continuum correlation in the small Magellanic cloud. Astrophysics and Space Science, 343 (1). pp. 301-317.

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Abstract

The local correlation between far-infrared (FIR) emission and radio-continuum (RC) emission for the Small Magellanic Cloud (SMC) is investigated over scales from 3 kpc to 0.01 kpc. Here, we report good FIR/RC correlation down to similar to 15 pc. The reciprocal slope of the FIR/RC emission correlation (RC/FIR) in the SMC is shown to be greatest in the most active star forming regions with a power law slope of similar to 1.14 indicating that the RC emission increases faster than the FIR emission. The slope of the other regions and the SMC are much flatter and in the range of 0.63-0.85. The slopes tend to follow the thermal fractions of the regions which range from 0.5 to 0.95. The thermal fraction of the RC emission alone can provide the expected FIR/RC correlation. The results are consistent with a common source for ultraviolet (UV) photons heating dust and Cosmic Ray electrons (CRe(-)s) diffusing away from the star forming regions. Since the CRe(-)s appear to escape the SMC so readily, the results here may not provide support for coupling between the local gas density and the magnetic field intensity.

Item ID: 25047
Item Type: Article (Research - C1)
ISSN: 1572-946X
Keywords: galaxies: individual (Small Magellanic Cloud), galaxies: ISM, infrared: galaxies, radio continuum: galaxies
Date Deposited: 20 Feb 2013 09:12
FoR Codes: 02 PHYSICAL SCIENCES > 0201 Astronomical and Space Sciences > 020103 Cosmology and Extragalactic Astronomy @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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