Gravitational collapse in molecular cloud cores around ultracompact H II regions - Two candidates

Details Gravitational collapse in molecular cloud cores around ultracompact H II regions - Two candidates Gravitational collapse in molecular cloud cores around ultracompact H II regions - Two candidates

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323l.117k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 323, Dec. 15, 1987, p. L117-L121.

Astronomy and Astrophysics

Astrophysics

55

Gravitational Collapse, H Ii Regions, Interstellar Matter, Molecular Clouds, Nebulae, Star Formation, High Resolution, Ionized Gases, Red Shift, Velocity Distribution, Very Large Array (Vla)

Scientific paper

Observations of NH3(1, 1) obtained with 10-arcsec resolution in the molecular cores surrounding two ultracompact H II regions, W3(OH) and G34.3+0.2, are reported. Both sources show extended emission components with velocity gradients consistent with rotation and absorption components that are redshifted with respect to the emission, suggesting gravitational infall. The velocity structure in both sources, and the density and temperature structure in W3(OH), appear similar to that around the previously observed H II region, G10.6-0.4, which is well modeled by a centrally condensed, and centrally heated, molecular core gravitationally collapsing onto the H II region. It is suggested that velocity and temperature structures similar to those seen in W3(OH), G34.3+0.2, and G10.6-0.4 may be a useful signature of gravitational collapse.

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