Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146..325k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 2, May 1985, p. 325-336.
Astronomy and Astrophysics
Astrophysics
17
Hydrogen Clouds, Interstellar Gas, Line Spectra, Molecular Clouds, Radio Spectra, Ammonia, Carbon Monoxide, Data Processing, Emission Spectra, Formyl Ions, Mass Distribution, Stellar Evolution
Scientific paper
The molecular cloud S 147/S 153, taken as an example of typical giant molecular cloud with a moderate star formation activity, has been mapped in several molecular lines [12CO(1-0), 13CO(1-0), HCO+(1-0), 12CO(2-1), 13CO(2-1), NH3(1,1), and NH3(2,2)] with different spatial resolutions (≡5arcmin, ≡1arcmin.4, and ≡0arcmin.7). The diffuse envelope shows a very smooth density structure and a velocity gradient strongly suggestive of an overall rotation of the cloud, even at the resolution of 1arcmin.4 towards the cloud core seen in 13CO. On the other hand, the NH3 emission, although mapped with a resolution only twice better, presents at least 3 different condensations in the cloud core, with a velocity pattern unrelated to the large scale gradient in the cloud. A detailed analysis of this NH3 emission suggests that the condensations are composed of many small turbulent clumps of mass ≡1 M_sun; and size ≡0.1 pc.
Guilloteau Stéphane
Kahane Claudine
Lucas Robert
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