Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...542l.143f&link_type=abstract
The Astrophysical Journal, Volume 542, Issue 2, pp. L143-L146.
Astronomy and Astrophysics
Astronomy
44
Ism: H Ii Regions, Ism: Clouds, Radio Continuum: Ism
Scientific paper
We report the density structure of the ultracompact (UC) H II regions G35.20-1.74, G9.62+0.19-E, and G75.78+0.34-H2O. The density profiles are derived from radio continuum emission at wavelengths from 6 to 0.3 cm. In the case of G35.20-1.74, a cometary UC H II region with a core and a tail, the spectrum of the core varies as Sν~ν0.6, implying that the density structure is ne~r-2. The emission from the tail has a flatter spectrum, indicating that the density gradient is also negative but shallower. For the case of G9.62+0.19, which is an H II region complex with several components, the spectrum of the region designated component E is Sν~ν0.95, corresponding to ne~r-2.5. The steepest spectral index, Sν~ν1.4, is for the super UC H II region G75.78+0.34-H2O its density stratification may be as steep as ne~r-4. The actual density gradient may be smaller, owing to an exponential (rather than a power-law) density distribution or to the effects of finite spatial extent. The contribution from dust emission and some of the possible implications of these density distributions are briefly discussed.
Franco Jose
Garcia-Segura Guillermo
Hofner Peter
Kurtz Stan
Martos Marco
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