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The Radio-FIR Correlation in the Milky Way

Published online by Cambridge University Press:  02 January 2013

J. Zhang ,
A. Hopkins ,
P. J. Barnes ,
M. Cagnes ,
Y. Yonekura  and
Y. Fukui
J. Zhang
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
A. Hopkins*
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia
P. J. Barnes
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia Astronomy Department, University of Florida, Gainesville, FL 32611, USA
M. Cagnes
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
Y. Yonekura
Affiliation:
Faculty of Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
Y. Fukui
Affiliation:
Department of Astrophysics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
*
FCorresponding author. Email: ahopkins@aao.gov.au
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Abstract

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We investigate the scale on which the correlation arises between the 843 MHz radio and the 60 μm far-infrared (FIR) emission from star forming regions in the Milky way. The correlation, which exists on the smallest scales investigated (down to ≈ 4 pc), becomes noticeably tight on fields of size 30′, corresponding to physical scales of ≈ 20–50 pc. The FIR to radio flux ratio on this scale is consi stent with the radio emission being dominated by thermal emission. We also investigate the location dependence of qmean, a parameter measuring the mean FIR to radio flux ratio, of a sample of star forming regions. We show that qmean displays a modest dependence on galactic latitude. If this is interpreted as a dependence on the intensity of star formation activity, the result is consistent with studies of the Large Magellanic Cloud (LMC) and other near by galaxies that show elevated values for q in regions of enhanced star formation.

Keywords

Galaxy: generalgalaxies: evolutiongalaxies: spiralgalaxies: starburstinfrared: galaxiesradio continuum: galaxies
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 27 , Issue 3 , 2010 , pp. 340 - 346
Copyright
Copyright © Astronomical Society of Australia 2010

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