DR 21(OH), a cluster in the making. 1: Observations in carbon monosulphide and methanol

Details DR 21(OH), a cluster in the making. 1: Observations in carbon monosulphide and methanol DR 21(OH), a cluster in the making. 1: Observations in carbon monosulphide and methanol

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286..555r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 286, no. 2, p. 555-564

Astronomy and Astrophysics

Astronomy

9

Carbon Compounds, Interstellar Chemistry, Interstellar Matter, Line Spectra, Methyl Alcohol, Radio Astronomy, Radio Spectra, Star Formation, Sulfides, Extremely High Frequencies, Local Thermodynamic Equilibrium, Millimeter Waves

Scientific paper

The star formation region DR 21(OH) was observed in the J=5-4 transitions of CS and C34S, and in several J=5-4 transitions of methanol. High velocity wings are detected in CS towards the main DR 21(OH) peak, extending over 80 km/s. They are very faint, and the outer wings are detected only at the center position. Since the outflow is not seen in the CO J=1-0 or 2-1 transitions, the CS observations suggest that this is a young, compact, dense and hot outflow. Many of the known NH3 cores are also seen in CS and methanol. Three known submm-continuum sources, DR 21(OH)S, DR 21(OH)SW, and DR 21(OH)NW, are suprisingly faint in the CS J=5-4 line, probably because the gas, though sufficiently dense, is too cold to fully excite the CS J=5-4 transition. They are, however, strong in methanol. An additional source, DR 21(OH)SE, is strong in CS but weak in methanol. The methanol lines were interpreted with an local thermodynamic equilibrium (LTE) analysis to estimate rotational temperatures and column densities at the main peaks, and the results discussed in the context of chemical models.

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