EXTENSIVE [C I] MAPPING TOWARD THE ORION-A GIANT MOLECULAR CLOUD

We have carried out wide-field (0.17 deg super(2)) and high-angular resolution (21".3 ~0.04 pc) observations in the [CI] 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 [CI] emis...

Full description

Saved in:
Bibliographic Details
Published in:Astrophysical journal. Letters 2013-09, Vol.774 (2), p.1-7
Main Authors: SHIMAJIRI, YOSHITO, Sakai, Takeshi, Tsukagoshi, Takashi, Kitamura, Yoshimi, MOMOSE, MUNETAKE, Saito, Masao, Oshima, Tai, Kohno, Kotaro, Kawabe, Ryohei
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CARBON MONOXIDE
CLOUDS
DENSITY
EMISSION
GIANT STARS
MAPPING
Mathematical models
Molecular clouds
MOLECULES
PHOTONS
RESOLUTION
Shells
TELESCOPES
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We have carried out wide-field (0.17 deg super(2)) and high-angular resolution (21".3 ~0.04 pc) observations in the [CI] 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 [CI] emission are similar to those of the super(12)CO (J = 1-0) emission by Shimajiri et al. in 2011; the total intensity ratio of the [CI] to CO emission ranges from 0.05 to 0.2. The optical depth of the [CI] emission is found to be 0.1-0.75, suggesting optically thin emission. The column density of the [CI] emission is estimated to be (1.0-19) x 10 super(17) cm super(-2). These results are consistent with the results of the previous [CI] 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 [CI] emission coincide with those of the super(12)CO emission, inconsistent with the prediction by the plane-parallel PDR model. In addition, the [CI] distribution in the Orion A cloud is found to be more similar to those of the super(13)CO (J = 1-0), C super(18)O (J = 1-0), and H super(13)CO super(+) (J = 1-0) lines than that of the super(12)CO (J = 1-0) line, suggesting that the [CI] emission is not limited to the cloud surface, but is tracing the dense, inner parts of the cloud.
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/774/2/L20