The structure and kinematics of the DR21 region

Details The structure and kinematics of the DR21 region The structure and kinematics of the DR21 region

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..167r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, March 1, 1986, p. 167-190.

Astronomy and Astrophysics

Astronomy

29

Astronomical Spectroscopy, Cosmic Dust, Interstellar Gas, Astronomical Photometry, Carbon Monoxide, Formyl Ions, Hydrocyanic Acid, Kinematics, Molecular Spectra, Submillimeter Waves

Scientific paper

Observations of the DR21/DR21(OH) region have been made in the molecular lines CO J = 2-1, CO J = 3-2, HCN J = 4-3, HCO+ J = 4-3, H13CO+ J = 4-3 and CS J = 7-6, supplemented by continuum observations of DR21 and DR21(OH) at 350 μm and a 20 μm map of DR21. The CO observations show a high-velocity wing region around DR21, which is blue shifted with respect to the -3 km s-1 central velocity of the source, and may be due to an outflow. The CS, HCN, HCO+ and H13CO+ intensities, spatial extents and line profiles, in addition to the self-absorptions seen in some CO lines, can be understood on the basis of a simple 2-component model similar to that of Norman & Silk and consisting of dense (105 - 106cm-3) clumps surrounded by a less dense (≡103cm-3) interclump gas of higher temperature.

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