Large-Scale Observations of Neutral Atomic Carbon in Giant Molecular Clouds and the Galactic Center.

Details Large-Scale Observations of Neutral Atomic Carbon in Giant Molecular Clouds and the Galactic Center. Large-Scale Observations of Neutral Atomic Carbon in Giant Molecular Clouds and the Galactic Center.

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt........17p&link_type=abstract

Thesis (PH.D.)--THE UNIVERSITY OF TEXAS AT AUSTIN, 1995.Source: Dissertation Abstracts International, Volume: 56-10, Section: B,

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In this dissertation we present the first large -scale (~ 30^ ' x 30^') observations of the ^3P_1 to^3P_0 transition of neutral carbon in five molecular clouds with nearby UV sources; Cep A, NGC 2024, S140, W3, and M17, and from the Galactic Center (a 2^circ strip). We have obtained beam-matched observations of the J = 2 to1 transition of ^ {13}CO, 12CO, and C18O. The overall extent and morphology of the different types of emission are similar, consistent with a picture in which the (C I) emission arises from the outermost clumps in the clouds. The average visual extinction through the rm Co/CO structure is < Av> ~10, implying that the overall rm Co/CO emitting structures (~0.6 pc) are much larger than the individual density condensations (~ 0.1 pc). In the bulk of the clouds, rm N(Co)/N(CO)~0.3, although if we include the C^+ column density, CO accounts for less than about half of the gas-phase carbon. Atomic carbon emission contributes significantly to the cooling of the dense ISM rm(I([ CI] ^3P_1to^3P_0)/COJ=2to1) ~1). The large ^ {13}CO/C18O abundances (~20) seen at the edges of molecular clouds is due to isotope selective photodissociation of C18O. To obtain the data we have built a re-imaging device for the Caltech Submillimeter Observatory, which converts the 10.4m telescope into a small (<1m) off-axis telescope with a 3^' beam. Because the design avoids having sunlight strike the CSO's primary, we can observe during the day when the full, 10.4 meter telescope is not otherwise usable.

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