Atomic Carbon and CO Isotope Emission in the Vicinity of DR15

Details Atomic Carbon and CO Isotope Emission in the Vicinity of DR15 Atomic Carbon and CO Isotope Emission in the Vicinity of DR15

2001-05-30

arxiv.org/abs/astro-ph/0105526v1

Astrophys.J. 623 (2005) 889-896

Astronomy and Astrophysics

Astrophysics

11 pages Latex, 6 figures, Accepted for publication in The Astrophysical Journal

Scientific paper

10.1086/321536

We present observations of the 3P1-3P0 fine structure transition of atomic carbon [CI], the J=3-2 transition of CO, as well as of the J=1-0 transitions of 13CO and C18O toward DR15, an HII region associated with two mid-infrared dark clouds (IRDCs). The 13CO and C18O J=1-0 emissions closely follow the dark patches seen in optical wavelength, showing two self-gravitating molecular cores with masses of 2000 Msun and 900 Msun, respectively, at the positions of the catalogued IRDCs. Our data show a rough spatial correlation between [CI] and 13CO J=1-0. Bright [CI] emission occurs in relatively cold gas behind the molecular cores, neither in highly excited gas traced by CO J=3-2 emission nor in HII region/molecular cloud interface. These results are inconsistent with those predicted by standard photodissociation region (PDR) models, suggesting an origin for interstellar atomic carbon unrelated to photodissociation processes.

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