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CO and CI observations of shock excited gas in IC443C

White, Glenn J. (1994). CO and CI observations of shock excited gas in IC443C. Astronomy & Astrophysics, 283 L25-L28.

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The blast-wave at the edge of the supernova remnant IC443 is colliding with nearby quiescent gas. In this paper a multi-transition study of CO J = 1 - 0 → J = 4 - 3 is presented of one of these clouds, IC443C, and the detection of atomic carbon, CI, reported. The CO is optically thin with Tex ~ 45K, a measured isotopic ratio CO/13CO = 80, and N(CO) ~ 2 - 4 1017. Atomic carbon emission was detected for the first time in shocked gas only towards the IC443C C-shocked region, with an abundance ratio CI/CO ~ 1.3 - 2.9. CI is overabundant by one order of magnitude compared with quiescent molecular cloud cores, suggesting that shock(s), or an enhanced cosmic ray flux density, has increased the CI/CO ratio. A narrow CO absorption line towards the shocked region IC443G has Tex ~ 13-18K, and nH2 ~ 2-3 103 cm-3, which may be typical of conditions in the pre-shock gas.

Item Type: Journal Article
Copyright Holders: 1994 European Southern Observatory
ISSN: 1432-0746
Keywords: interstellar medium; abundances; clouds; IC443
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 32721
Depositing User: G. J. White
Date Deposited: 20 Feb 2012 14:19
Last Modified: 29 Feb 2016 08:27
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