The GASS HI Survey And FIR Emission From The Magellanic Stream

Details The GASS HI Survey And FIR Emission From The Magellanic Stream The GASS HI Survey And FIR Emission From The Magellanic Stream

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1417j&link_type=abstract

American Astronomical Society, AAS Meeting #211, #14.17; Bulletin of the American Astronomical Society, Vol. 39, p.762

Astronomy and Astrophysics

Astronomy

Scientific paper

The new Galactic All Sky Survey (GASS) measured 21cm neutral hydrogen using the Parkes Multibeam instrument at high velocity resolution over all declinations south of the equator. We use a preliminary reduction of these data to study the correlation between HI and far-infrared emission (as derived from the IRIS reprocessing of the IRAS 100-micron survey) across the Southern Hemisphere, and particularly in the Magellanic Stream. While the Magellanic Stream is prominent in HI, it is essentially invisible in the FIR with a FIR emissivity per HI atom at most one tenth that of Galactic disk gas. The low FIR emissivity of the Magellanic Stream allows to trace it in maps of the FIR/HI ratio as a shadow across the sky, even where its HI is blended with local around V(lsr) = 0.

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