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.

URL: http://adsabs.harvard.edu/abs/1986MNRAS.219..167R

Abstract

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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