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25 April 2024

» arxiv » astro-ph/9912261

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Large-scale mapping observations of the CI(3P1-3P0) and CO(J=3-2) lines toward the Orion A molecular cloud
Masafumi Ikeda ; Hiroyuki Maezawa ; Tetsuya Ito ; Gaku Saito ; Yutaro Sekimoto ; Satoshi Yamamoto ; Ken’ichi Tatematsu ; Yuji Arikawa ; Yoshiyuki Aso ; Takashi Noguchi ; Sheng-Cai Shi ; Keisuke Miyazawa ; Syuji Saito ; Hiroyuki Ozeki ; Hideo Fujiwara ; Masatoshi Ohishi ; Junji Inatani ;
Date:	14 Dec 1999
Journal:	ApJ. 527 (1999), L59
Subject:	astro-ph
Abstract:	Large scale mapping observations of the 3P1-3P0 fine structure transition of atomic carbon (CI, 492 GHz) and the J=3-2 transition of CO (346 GHz) toward the Orion A molecular cloud have been carried out with the Mt. Fuji submillimeter-wave telescope. The observations cover 9 square degrees, and include the Orion nebula M42 and the L1641 dark cloud complex. The CI emission extends over almost the entire region of the Orion A cloud and is surprisingly similar to that of 13CO(J=1-0).The CO(J=3-2) emission shows a more featureless and extended distribution than CI.The CI/CO(J=3-2) integrated intensity ratio shows a spatial gradient running from the north (0.10) to the south (1.2) of the Orion A cloud, which we interpret as a consequence of the temperature gradient. On the other hand, the CI/13CO(J=1-0) intensity ratio shows no systematic gradient. We have found a good correlation between the CI and 13CO(J=1-0) intensities over the Orion A cloud. This result is discussed on the basis of photodissociation region models.
Source:	arXiv, astro-ph/9912261
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