Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.8417d&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #84.17; Bulletin of the American Astronomical Society, Vol. 26, p.1459
Astronomy and Astrophysics
Astronomy
Scientific paper
The bipolar HII region K3-50A has been observed in the radio recombination lines (RRLs) H92alpha and He92alpha with the Very Large Array, and in the Bralpha recombination line with the United Kingdom Infrared Telescope. The spatial and spectral resolutions of the two observations are 2.3\arcsec and 7 km s(-1) for the RRLs and 1.3\arcsec and 19 km s(-1) for Bralpha . Velocity gradients consistent with rotation ( ~ 20 km s(-1) pc(-1) ) and an outflow parallel to the rotation axis ( ~ 150 km s(-1) pc(-1) ) are observed in the ionized gas. Furthermore, Bralpha emission is detected from regions (perpendicular to the ionized outflow) where there is no radio continuum emission. This Bralpha emission is most likely due to IR photons which are scattered from dust in a disk that directs the outflow. This hypothesis is supported by existing interferometric HCO(+) (J=1->0) observations of the surrounding molecular material (Vogel & Welch 1983) which appear to show a rotating, flattened molecular disk. Together, these data allow a self-consistent picture of K3-50A to be constructed in which a rotating molecular disk directs a bipolar ionized outflow.
Cecil Gerald
de Pree Chris
Geballe Theodore
Goss William Miller
Mehringer David
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