The M(17)SW molecular source - internally or externally heated?

Chown, M. P.; Beckman, J. E.; Cronin, N. J. and White, G. J. (1982). The M(17)SW molecular source - internally or externally heated? In: Beckman, J. E. and Phillips, J. P. eds. Submillimetre Wave Astronomy. Cambridge: Cambridge University Press, pp. 159–165.

URL:	http://adsabs.harvard.edu/abs/1982smwa.book..159C
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Abstract

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 Section
Copyright Holders:	1982 Not known
ISBN:	0-521-24733-0, 978-0-521-24733-7
Keywords:	astronomical spectroscopy; gas heating; molecular clouds; carbon monoxide; density distribution; gas temperature
Academic Unit/School:	Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID:	33798
Depositing User:	G. J. White
Date Deposited:	06 Jun 2012 13:32
Last Modified:	07 Dec 2018 10:06
URI:	http://oro.open.ac.uk/id/eprint/33798
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