Chown, M. P.; Beckman, J. E.; Cronin, N. J. and White, G. J.
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From a measurement of the J = 3→2 rotational emission line of hydrogen isocyanide, and a literature value for that J = 1→0 line (Snell, 1979), the excitation parameters for HNC in the direction of the molecular peak as determined by CO were derived. Kinetic temperatures for the optically thick CO and 13CO transitions are ~ 50 K, while that pertaining to HNC line formation is between 20 K and 5 K. The inference that the central temperature of the cloud is lower than that of its surface supports models in which the cloud is heated not from within, but by the O-B association to the northwest.
|Item Type:||Book Chapter|
|Copyright Holders:||1982 Not known|
|Keywords:||astronomical spectroscopy; gas heating; molecular clouds; carbon monoxide; density distribution; gas temperature|
|Academic Unit/Department:||Science > Physical Sciences
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||G. J. White|
|Date Deposited:||06 Jun 2012 13:32|
|Last Modified:||18 Jan 2016 14:13|
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