A Spectral Line Survey of the Ultracompact HII Region G34.3+0.15. II: 155.3--165.3 GHz

Details A Spectral Line Survey of the Ultracompact HII Region G34.3+0.15. II: 155.3--165.3 GHz A Spectral Line Survey of the Ultracompact HII Region G34.3+0.15. II: 155.3--165.3 GHz

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jkas...34..167k&link_type=abstract

Journal of the Korean Astronomical Society, vol. 34, no. 3, pp. 167-179

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4

Hii Region, Ism: Individual (G34.3+0.15), Ism: Molecules, Ism: Abundances, Stars: Formation, Radio Lines: Ism

Scientific paper

A molecular line survey towards the UC HII region G34.3+0.15 from 155.3 to 165.3 GHz has been conducted with the TRAO 14-m radio telescope. Combined with our previous observations from 84.7 to 115.6 GHz and 123.5 to 155.3 GHz (Paper I), the spectral coverage of this survey in G34.3+0.15 now runs from 85 to 165 GHz. From these latest observations, a total of 18 lines from 6 species were detected. These include four new lines corresponding to Delta J=0, Delta K=1 transitions of the CH3OH E--type species, and two new lines corresponding to transitions from SO2 and HC3N. These 6 new lines are rm CH3OH [1(1)-1(0) E], CH3OH [2(1)-2(0) E], rm CH3OH [3(1)-3(0) E], CH3OH [4(1)-4(0) E], SO2 [14(1,13)-14(0,14)] and HC3N [18-17]. We applied a rotation diagram analysis to derive rotation temperatures and column densities from the methanol transitions detected, and combined with NRAO 12-m data from Slysh et al.(1999). Applying a two-component fit, we find a cold component with temperature 13-16 K and column density 3.3-3.4E+14/cm2, and a hot component with temperature 64-83 K and column density 9.3E+14 - 9.7E+14/cm2. On the other hand, applying just a one-component fit yields temperatures in the 47-62 K range and column densities from 7.5-1.1E+15/cm2.

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