Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251l...1m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. L1-L4. Research supported by Universitaet Bonn.
Astronomy and Astrophysics
Astronomy
21
Absorption Spectra, H Lines, Magellanic Clouds, Radio Telescopes, Sky Surveys (Astronomy), Astronomical Observatories, Brightness Temperature, Galactic Evolution, Interstellar Gas, Milky Way Galaxy
Scientific paper
Twenty-one-cm emission and absorption-line observations were carried out with the Parkes 64-m radio telescope and the Australia Telescope Compact Array, respectively, towards extragalactic radio continuum background sources in the area of the Magellanic Clouds and Stream. The H I emission indicates strong clumping on angular scale-sizes less than or equal to the 15-arcmin beam of the Parkes radio telescope. No H I absorption was found down to an optical-depth limit of tau equal to or less than 0.002. Comparing average absorption properties, the Magellanic System has less absorbing material than the Galaxy and M 31. If clumping is ignored, lower limits to the spin temperature of up to 600 K are found for the gas in the outer halo and in the bridge region of the Magellanic Clouds.
Greisen Eric W.
Haynes Raymond F.
Herbstmeier Uwe
Kalberla Peter M. W.
Mebold Ulrich
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