期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 774, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/774/2/L20
关键词
atomic data; ISM: clouds; ISM: individual objects (Orion-A giant molecular cloud); photon-dominated region (PDR)
资金
- JSPS KAKENHI [90610551]
- project gSTARFICHh [ANR-11-BS56-010]
- Grants-in-Aid for Scientific Research [25247016, 23103001] Funding Source: KAKEN
We have carried out wide-field (0.17 deg(2)) and high-angular resolution (21 ''.3 similar to 0.04 pc) observations in the [C I] line toward the Orion-A giant molecular cloud with the Atacama Submillimeter Telescope Experiment 10 m telescope in the On-The-Fly mode. The overall features of the [C I] emission are similar to those of the (CO)-C-12 (J = 1-0) emission by Shimajiri et al. in 2011; the total intensity ratio of the [C I] to CO emission ranges from 0.05 to 0.2. The optical depth of the [C I] emission is found to be 0.1-0.75, suggesting optically thin emission. The column density of the [C I] emission is estimated to be (1.0-19) x 10(17) cm(-2). These results are consistent with the results of the previous [C I] observations with a low-angular resolution of 2'.2. In the nearly edge-on photon-dominated regions (PDRs) and their candidates of the Orion Bar, DLSF, M 43 Shell, and Region D, the distributions of the [C I] emission coincide with those of the (CO)-C-12 emission, inconsistent with the prediction by the plane-parallel PDR model. In addition, the [C I] distribution in the Orion A cloud is found to be more similar to those of the (CO)-C-13 (J = 1-0), (CO)-O-18 (J = 1-0), and (HCO+)-C-13 (J = 1-0) lines than that of the (CO)-C-12 (J = 1-0) line, suggesting that the [C I] emission is not limited to the cloud surface, but is tracing the dense, inner parts of the cloud.
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