Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....66..155l&link_type=abstract
Astronomy and Astrophysics, vol. 66, no. 1-2, May 1978, p. 155-160.
Astronomy and Astrophysics
Astrophysics
56
Interstellar Gas, Molecular Spectra, Nebulae, Astronomical Spectroscopy, Formaldehyde, Gas Density, H Ii Regions, Hydrocyanic Acid, Hydroxyl Emission
Scientific paper
The discovery of a dense molecular cloud associated with the Sharpless H II region S 106 is reported. The cloud is studied on the basis of millimeter-wave observations of the emission lines due to CO at 115 GHz, (C-13)O at 110 GHz, ionized HCO at 89 GHz, HCN at 86 GHz, H2CO at 140 GHz, and OH at 1612 and 1720 GHz, as well as a 6-cm absorption spectrum of H2CO and the 18-cm absorption spectrum of OH. Maps of integrated line-profile isocontours are presented for the various emissions, and column densities are estimated for the species observed. A large-scale picture of the S 106 complex is proposed in which a large (approximately 15 pc in diameter) and massive (about 26,000 solar masses) molecular cloud slowly rotates about an axis with position angle 30 deg, a denser part of this cloud is responsible for the hydrocarbon emissions, and far-IR radiation from dust surrounding or embedded in the H II region may pump the OH molecules out of thermal equilibrium.
Encrenaz Pierre J.
Kazes Ilya
Le Squeren Anne-Marie
Lucas Robert
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