Rotating and expanding ultracompact H II regions

Details Rotating and expanding ultracompact H II regions Rotating and expanding ultracompact H II regions

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..553g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 15, 1986, p. 553-563.

Astronomy and Astrophysics

Astronomy

64

H Ii Regions, Interstellar Gas, Radio Sources (Astronomy), Star Formation, Continuous Spectra, Line Spectra, Radio Spectra, Recombination Reactions, Spectral Line Width

Scientific paper

The H76α radio recombination line from two ultracompact H II regions, G34.3+0.2 and G45.07+0.13, is mapped with an angular resolution of 0arcsec.4 using the VLA. The line center velocity of G34.3+0.2 shows a remarkably gradual shift across the source by ≡23 km s-1. The radio continuum appearance of G34.3+0.2 might be explained as the H II region being embedded in a dense molecular slab and experiencing the "champagne" phase of its evolution. Further, the velocity structure of G34.3+0.2 suggests that the circumstellar molecular slab or disk is rotating around a central object, probably a cluster of stars. 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-1 with respect to the central star.

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