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The structure and kinematics of the DR21 region

Richardson, K. J.; White, Glenn J.; Phillips, J. P. and Avery, L. W. (1986). The structure and kinematics of the DR21 region. Monthly Notices of the Royal Astronomical Society, 219 pp. 167–190.

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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.

Item Type: Journal Item
Copyright Holders: 1986 Royal Astronomical Society
ISSN: 1365-2966
Keywords: astronomical spectroscopy; cosmic dust; interstellar gas; astronomical photometry; carbon monoxide; formyl ions; hydrocyanic acid; kinematics; molecular spectra; submillimeter waves
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 33517
Depositing User: G. J. White
Date Deposited: 04 May 2012 08:48
Last Modified: 14 Dec 2018 03:05
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