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Title:
Co/ and DI Observations of Shock Excited Gas in IC443C
Authors:
White, G. J.
Publication:
Astronomy and Astrophysics, Vol. 283, NO. 3/MAR(III), P. L25, 1994 (A&A Homepage)
Publication Date:
03/1994
Origin:
KNUDSEN
Astronomy Keywords:
interstellar medium: abundances - clouds - IC443
Bibliographic Code:
1994A&A...283L..25W

Abstract

The blast-wave at the edge of the supernova remnant 1C443 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.

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