Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...18512207h&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #122.07; Bulletin of the American Astronomical Society, Vol. 26, p.1522
Astronomy and Astrophysics
Astronomy
3
Scientific paper
We report the discovery a bipolar molecular outflow centered on the ultracompact HII (UCHII) region G45.12+0.13 that we have mapped in the CO 2->1, 3->2, 6->5, (13) CO 2->1 and C(18) O 2->1 transitions at the Caltech Submillimeter Observatory. The north-south bipolar structure appears consistently in all of the (12) CO lines as well as in the (13) CO line. At a distance of 9.5 kpc, the outflow is 3.0 pc in length with a characteristic velocity of 7.0 km s(-1) and a dynamical timescale of 2.1 times 10(5) yr. Since the dynamical age of the UCHII region under the strong shock approximation is only 2.6 times 10(4) yr, these measurements imply that ~ 90% of the molecular outflow expansion occurred prior to the birth of the UCHII region. Alternatively, the discrepancy in timescales could be taken as additional evidence for the inhibited expansion of UCHII regions first proposed by Wood & Churchwell (1989) on statistical grounds.
Hunter Todd Russell
Menten Karl. M.
Phillips Thomas G.
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