G10.62 and G29.96: VLA Radio Recombination Line Observations of Ultracompact H II Regions

Details G10.62 and G29.96: VLA Radio Recombination Line Observations of Ultracompact H II Regions G10.62 and G29.96: VLA Radio Recombination Line Observations of Ultracompact H II Regions

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.3012a&link_type=abstract

American Astronomical Society, 184th AAS Meeting, #30.12; Bulletin of the American Astronomical Society, Vol. 26, p.907

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We present a non-LTE analysis of high spatial resolution observations in the radio recombination lines H110alpha , H76alpha , H66alpha , and H42alpha of the ultracompact H II regions G10.62-0.38 and G29.96-0.02. The regions are of core-halo and cometary morphology, respectively. We find electron temperatures higher than predicted from the Galactic electron temperature gradient observed by Shaver in classical H II regions. We also observe inhomogeneity in electron density. Although collisional broadening depresses line amplitudes at H110alpha , the other lines are closer to LTE. Various models have been suggested for the regions: for G10.62, Keto and Ho have proposed a collapsing core; for G29.96, Van Buren and Mac Low suggest a bow shock. We re-evaluate the models in light of the new data.

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