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In a skeptical vein - In a skeptical vein Kennicutt(in The...

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In a skeptical vein, Kennicutt (in The Interstellar Medium in Galaxies , Kluwer, 1990) points out that the same CO-FIR relation is also followed by a burning cigar, his Jeep, the Yellowstone forest fire, and the observable Universe. This may be another manifestation of the well-known astrophysical principle that big galaxies are big and little ones are little, so that differences among scale-linked properties are second-order effects. An example of mid-IR galaxy structure (which is thought from the few well-studied examples to be a good proxy for FIR appearance) is this 15-micron image of M51, from an ISO WWW press release . Many of the H II regions and young star clusters are prominent sources in the thermal grain emission, as one might expect. Perhaps more important is the small number of sources with no obvious optical counterpart, marking deeply obscured star-forming regions which don't appear in Hα or UV censuses. Recent Herschel observations have given comparable angular resolution in the far-IR, so a comparison of various grain populations at different temperatures is much easier:
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