The Ultracompact HII-region G45.07+0.13: An Ionized Bipolar Outflow?

Details The Ultracompact HII-region G45.07+0.13: An Ionized Bipolar Outflow? The Ultracompact HII-region G45.07+0.13: An Ionized Bipolar Outflow?

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..306l&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

Computer Science

Scientific paper

We present continuum and hydrogen recombination line observations of the ultracompact HII-region G45.07+0.13 at cm-wavelengths with the VLA, as well as molecular line observations of the surrounding neutral gas at 3 mm with the BIMA-array. We show that the bright inner region of G45.07+0.13 has a bipolar structure, which is well aligned with and has a velocity gradient in the same sense as the larger-scale bipolar molecular outflow seen in 13CO. We discuss the possibility that G45.07+0.13 is an ionized bipolar outflow. The bipolar structure may reflect the preferential expansion of an ionized stellar wind or the stellar UV ionization front along the less dense polar direction of the surrounding molecular gas core, partially or nearly entirely evacuated in this direction by the passage of a bipolar outflow. Alternatively, the stellar UV may be lighting up a genuine, ongoing bipolar outflow.

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