Cool Gas in the Magellanic Stream

Details Cool Gas in the Magellanic Stream Cool Gas in the Magellanic Stream

2009-01-22

arxiv.org/abs/0901.3415v1

Astrophys.J.691:L115-L118,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Scientific paper

10.1088/0004-637X/691/2/L115

We present the first direct detection of cold atomic gas in the Magellanic Stream, through 21 cm line absorption toward a background radio source, J0119 - 6809, using the Australia Telescope Compact Array. Two absorption components were identified at heliocentric velocities 218.6 km/s and 227.0 km/s, with optical depths of tau ~ 0.02. The corresponding H I emission region has a column density in excess of 2 x 10^20 cm^{-2}. The inferred spin temperature of the emitting gas is ~70 K. We failed to find cool gas in observations of three other radio continuum sources. Although we have definitively detected cool gas in the Stream, its spin temperature is higher than similar components in the LMC, SMC and Bridge, and its contribution to the total H I density is probably lower. No corresponding 12CO(J = 1 -> 0) or dust appears to be associated with the cool gas, suggesting that the cloud is not forming stars.

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