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Date and Time of the Query: 2018-10-15 T14:20:21 PDT
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For refcode 2000ApJ...538..134T:
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2000ApJ...538..134T The Spatial Distribution of Atomic Carbon Emission in the Giant Molecular Cloud NGC 604-2 Christopher L. Taylor Ruhr-Universitdt Bochum, Astronomisches Institut Universitdtsstr. 150, D-44870 Bochum, Germany; and Five College Radio Astronomy Observatory, University of Massachusetts, Amherst, MA 01003; chris@fcrao1.astro.umass.edu and Christine D. Wilson McMaster University Department of Physics and Astronomy Hamilton, Ontario, L8S 4M1, Canada; wilson@physics.mcmaster.ca Received 1999 December 14; accepted 2000 February 25 ABSTRACT We have mapped a giant molecular cloud in the giant H II region NGC 604 in M33 in the 492 GHz ^3^P_1_ -> ^3^P_0_ transition of neutral atomic carbon using the James Clerk Maxwell Telescope. We find the distribution of the [C I] emission to be asymmetric with respect to the CO J = 1 -> 0 emission, with the peak of the [C I] emission offset toward the direction of the center of the H II region. In addition, the line ratio I_[C I]_/I_CO_ is highest (~0.2) facing the H II region and lowest (<~0.1) away from it. These asymmetries indicate an edge-on morphology where the [C I] emission is strongest on the side of the cloud facing the center of the H II region and not detected at all on the opposite side This suggests that the sources of the incident flux creating C from the dissociation of CO are the massive stars of the H II region. The lowest line ratios are similar to what is observed in Galactic molecular clouds, while the highest are similar to starburst galaxies and other regions of intense star formation. The column density ratio, N(C)/N(H_2_) is a few x 10^-6^, in general agreement with models of photodissociation regions. Subject headings: galaxies: individual (M33)-galaxies: ISM-H II regions- ISM: individual (NGC 604)-ISM: molecules-radio lines: ISM
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