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Title:
The Radio-FIR Correlation in the Milky Way
Authors:
Zhang, J.; Hopkins, A.; Barnes, P. J.; Cagnes, M.; Yonekura, Y.; Fukui, Y.
Affiliation:
AA(Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia), AB(Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia; Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia ), AC(Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia; Astronomy Department, University of Florida, Gainesville, FL 32611, USA), AD(Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia), AE(Faculty of Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan), AF(Department of Astrophysics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan)
Publication:
Publications of the Astronomical Society of Australia, Volume 27, Issue 3, pp. 340-346. (PASA Homepage)
Publication Date:
09/2010
Origin:
PASA
Astronomy Keywords:
Galaxy: general, galaxies: evolution, galaxies: spiral, galaxies: starburst, infrared: galaxies, radio continuum: galaxies
Abstract Copyright:
(c) 2010 Astronomical Society of Australia
DOI:
10.1071/AS08072
Bibliographic Code:
2010PASA...27..340Z

Abstract

We investigate the scale on which the correlation arises between the 843MHz radio and the 60mum far-infrared (FIR) emission from star forming regions in the Milky way. The correlation, which exists on the smallest scales investigated (down to ~4pc), becomes noticeably tight on fields of size 30', corresponding to physical scales of ~20-50pc. The FIR to radio flux ratio on this scale is consistent 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 nearby galaxies that show elevated values for q in regions of enhanced star formation.
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