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- W2007496650 abstract "We have observed the 158 μm2P3/2←2P1/2 fine-structure line of C II, the J = 9 → 8, 12 → 11, and 17 → 16 lines of 12CO, and the J = 9 → 8 rotational transition of 13CO in the molecular cloud and photodissociation region (PDR) associated with NGC 3576. The line profiles were fully resolved using a heterodyne spectrometer with better than 1 km s-1 resolution. The high-J CO emission arises from a spatially compact region near the infrared peak that is characterized by a kinetic temperature near 150 K and a density nH2 5 × 105 cm-3. The 12CO J = 9 → 8 line is found to be optically thick and arises from a more extended, cooler region with Tkin ~ 60 K. The increase in excitation temperature with the rotational level of CO suggests that the ionizing source is located behind much of the molecular cloud. Less than 1% of the molecular cloud material is found in the warm PDR and cloud interface region. The C II fine-structure line emission is intense over more than 4' × 4' and shows a central self-absorption feature at many locations. This absorption may represent a cooler or less dense component of ionized gas associated with the foreground molecular cloud." @default.
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- W2007496650 date "1997-08-01" @default.
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- W2007496650 title "Far‐Infrared Spectroscopy of C ii and High‐ J CO Emission from Warm Molecular Gas in NGC 3576" @default.
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- W2007496650 doi "https://doi.org/10.1086/313026" @default.
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