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The Radio-FIR Correlation in the Milky Way

  • J. Zhang (a1), A. Hopkins (a1) (a2), P. J. Barnes (a1) (a3), M. Cagnes (a1), Y. Yonekura (a4) and Y. Fukui (a5)...

Abstract

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.

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Copyright

Corresponding author

FCorresponding author. Email: ahopkins@aao.gov.au

References

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