The Radio-FIR correlation in the Milky Way

Details The Radio-FIR correlation in the Milky Way The Radio-FIR correlation in the Milky Way

2010-06-22

arxiv.org/abs/1006.4282v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 4 figures, accepted for publication by PASA

Scientific paper

We investigate the scale on which the correlation arises between the 843 MHz radio and the 60 micron 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 consistent with the radio emission being dominated by thermal emission. We also investigate the location dependence of q_mean, a parameter measuring the mean FIR to radio flux ratio, of a sample of star forming regions. We show that q_mean 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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