Dark cloud chemistry in initially H-rich regions

Rawlings, J.M.C., Hartquist, T.W., Williams, D.A. and Falle, S.A.E.G. (2002) Dark cloud chemistry in initially H-rich regions. Astronomy and Astrophysics, 391 (2). pp. 681-687. ISSN 0004-6361

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Abstract

The chemistry in dark regions of dense cores is explored as a function of the initial abundance ratio of H to H 2, on the assumption that some cores form on a timescale and are younger than the time required for the H :H 2 ratio to attain its equilibrium value. Observational diagnostics of non-equilibrium values of the initial H :H 2 ratio are identified. In initially H-rich material, the abundances of OH, NH 3, CN, and HNC are for some time higher than they are in initially H-poor material. In initially H-poor regions, the abundances of CO, species containing multiple carbon atoms in each molecule, and CS are larger for an (observationally significant) period than in initially H-rich material.

Item Type:	Article
Copyright, Publisher and Additional Information:	© ESO 2002
Keywords:	ISM, clouds, molecules, astrochemistry, molecular processes
Academic Units:	The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Mathematics (Leeds) > Applied Mathematics (Leeds)
Depositing User:	Repository Assistant
Date Deposited:	02 Jun 2006
Last Modified:	08 Feb 2013 17:02
Published Version:	http://dx.doi.org/10.1051/0004-6361:20020825
Status:	Published
Publisher:	EDP Sciences
Refereed:	Yes
Identification Number:	10.1051/0004-6361:20020825
URI:	http://eprints.whiterose.ac.uk/id/eprint/1253

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