Rotating and expanding ultracompact H II regions
Journal Article
·
· Astrophys. J.; (United States)
The H76-alpha recombination line and radio continuum emission was observed from two compact H II regions, G34.3+0.2 and G45.07+0.13. The line center velocity of G34.3+0.2 shows a remarkably gradual shift across the source by about 23 km/s. The corresponding velocity gradient of about 3 x 10 to the -11th/s is the largest observed to date among either young regions of star formation or dark interstellar clouds. The radio continuum appearance of G34.3+0.2 may result from the H II region being embedded in a dense molecular slab and experiencing the champagne phase of its evolution. The velocity and radio continuum structure of G45.07+0.13 suggest the existence of an ionized ring that is expanding at a velocity of 10 km/s with respect to the central star. 43 references.
- Research Organization:
- European Southern Observatory, Garching, West Germany; Universidad Nacional Autonoma de Mexico, Alvaro Obregon, Mexico; National Radio Astronomy Observatory, Socorro, NM
- OSTI ID:
- 6836550
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 309; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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