Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283l..25w&link_type=abstract
Astronomy and Astrophysics, Vol. 283, NO. 3/MAR(III), P. L25, 1994
Astronomy and Astrophysics
Astrophysics
11
Interstellar Medium: Abundances - Clouds - Ic443
Scientific paper
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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