Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...18512206a&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #122.06; Bulletin of the American Astronomical Society, Vol. 26, p.1522
Astronomy and Astrophysics
Astronomy
Scientific paper
We have completed a series of high-resolution radio recombination line (RRL) observations toward G10.62. This ultracompact (UC) H II region, one of the brightest IRAS point sources, is thought to be ionized by an O4 - 05.5 star embedded in molecular cloud. Keto, Ho and Haschick (1988) have proposed a collapsing core model for the surrounding molecular gas based on high spatial resolution observations in NH3. Our subarcsecond-resolution RRL observations probe the dynamics of the central ionized medium. We observe velocity structure in the ionized gas similar to that observed in NH3, and the H65alpha line is dynamically broadened throughout the nebula. The core density is greater than 10(5) cm(-3) , and its temperature is approximately 8000K, compared to 6000K in the nearby diffuse cometary H II region, perhaps implying quenching of coolants in very dense H II regions. We also observe impact broadening in the H110alpha line toward the core.
Afflerbach A.
Churchwell Edward
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