We present high angular resolution observations obtained with the Owens Valley mm-array of CH_3CN(J=6--5) and C(18) O(J=1--0), and 2.7mm continuum toward the cometary HII region G29.96--0.02. We find a strong continuum source located at the apex of the cometary HII region, coincident with NH_3(4,4) and 22GHz water maser emission. This region is interpreted as a new center of massive star formation, in an evolutionary phase prior to the development of a visible HII region. Here we discuss preliminary models for the continuum emission from this source. The CH_3CN(J=6--5) line is coincident with the continuum source mentioned above. We derive the physical properties of the molecular gas and comment on a possible abundance enhancement of CH_3CN. Our C(18) O observations trace the more extended molecular core associated with this region of massive star formation. Based on a comparison with recent NIR observations of G29.96--0.02, we derive constraints on the distribution of molecular and ionized gas along the line of sight.
American Astronomical Society Meeting Abstracts #188
- Pub Date:
- May 1996