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Paper: Carbon in photon dominated regions: C II/C I/CO observations of NGC 2024
Volume: 73, Airborne Astronomy Symposium on the Galactic Ecosystem: From Gas to Stars to Dust
Page: 79
Authors: Jaffe, Dan T.; Plume, R.
Abstract: We present observations of the large-scale distribution of the major forms of carbon, neutral and singly ionized atomic carbon and carbon monoxide, in the NGC 2024/Orion B cloud. The overall extent and morphology of the different types of emission are similar, consistent with a picture in which the atomic carbon lies on the UV-illuminated surfaces of molecular clumps throughout the cloud. However, emission from ionized carbon extends considerably farther to the west than the CO emission. Integrated over the region mapped in the 158 mu m (C II) line, about half of the gas-phase carbon is in a form other than CO.
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