AST/RO Observations of [CI] in Galactic H II Regions

Details AST/RO Observations of [CI] in Galactic H II Regions AST/RO Observations of [CI] in Galactic H II Regions

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.5810h&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #58.10; Bulletin of the American Astronomical Society, Vol. 30, p.905

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present the results of a study of atomic carbon ({() 3P_1 ->() 3P_0}) emission from Southern Hemisphere H \ II regions using the Antarctic Submillimeter Telescope and Remote Observatory (AST/RO). One part of our H \ II region sample consists of 49 compact, relatively isolated members of the Wilson et al. (1970) hydrogen radio recombination line (RRL) emission catalogue. Most [C \ I ] spectra of the sample show multiple emission components, and every H \ II region has associated [C \ I ] emission near the RRL velocity. The mean linewidth of these [C \ I ] components is 6.8 +/- 3.0 km s(-1) ; this cannot be explained by thermal broadening and indicates that turbulent broadening is important. RRL-associated [C \ I ] emission components are brighter than those not associated with H \ II regions, which suggests that the [C \ I ] intensities are dominated by local heating. The second part of our sample consists of 11 H \ II regions from the Caswell and Haynes (1987) radio recombination line catalogue. We have observed fine-structure C(+) (157 mu m) emission using the Long Wavelength Spectrometer (LWS) on board the ISO satellite. We have also observed both CO J=4-3 and [C \ I ] emission using AST/RO, and H_{91alpha }, H_{92alpha } RRLs using the 140-foot radiotelescope at NRAO Greenbank. We discuss the physical properties of the H \ II regions based on the different tracers of ionized, neutral, and molecular gas in the sample. This research was supported by the National Science Foundation under a cooperative agreement with the Center for Astrophysical Research in Antarctica (CARA), grant number NSF OPP 89-20223. CARA is a National Science Foundation Science and Technology Center.

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