Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144...27k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 1, March 1985, p. 27-36. Research supported by the Stichting Astronom
Astronomy and Astrophysics
Astronomy
61
Absorption Spectra, Astronomical Maps, Hydrogen Clouds, Neutral Gases, Radio Sources (Astronomy), Spin Temperature, Brightness Temperature, Gas Density, Mass Distribution, Microwave Emission, Microwave Spectra
Scientific paper
High resolution H I emission and absorption data in the field of 3C147 have been obtained by combining observations from both the Westerbork and the 100 m Effelsberg telescopes. The H I brightness temperature distribution is clumpy. The absorption features can be identified with small scale (3arcmin to 6arcmin) features having brightness temperatures in the range 4 to 10K. These clumps have excitation temperatures between 34 and 74K. Their sizes are 0.5 to 1 pc, densities 20 to 50 cm-3 and the H I masses 0.03 to 0.5 M_sun;, assuming a distance of 500 pc. The clumps of absorbing H I gas are associated with extended warm halos which dominate the observed H I emission. The fact that the absorbing gas is concentrated in small scale clumps provides severe constraints for the interpretation of previously determined apparent spin temperatures.
Goss William Miller
Kalberla Peter M. W.
Schwarz Ulrich J.
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