Ammonia Absorption toward the Ultracompact H II Regions G45.12+0.13 and G45.47+0.05

Details Ammonia Absorption toward the Ultracompact H II Regions G45.12+0.13 and G45.47+0.05 Ammonia Absorption toward the Ultracompact H II Regions G45.12+0.13 and G45.47+0.05

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...514..899h&link_type=abstract

The Astrophysical Journal, Volume 514, Issue 2, pp. 899-908.

Astronomy and Astrophysics

Astronomy

9

Ism: H Ii Regions, Ism: Individual (G45.12+0.13, G45.47+0.05), Ism: Molecules, Stars: Formation

Scientific paper

We present observations of the 1.3 cm continuum and NH_3(2,2) and (4,4) inversion lines toward the two ultracompact H II regions G45.12+0.13 and G45.47+0.05 with a resolution of about 3^''. In G45.12+0.13 we find that the continuum emission from the ultracompact core is embedded in a larger region with an extent of about 20^''x10^''. Compact absorption in the NH_3(2,2) and (4,4) lines is detected against the bright continuum core. The ammonia data indicate T_rot=78 K and N(NH_3)=1.4x10^16 cm^-2. The molecular gas traced by the NH_3 absorption is blueshifted by about 5 km s^-1 with respect to the ionized gas and the bulk of the molecular gas in the region. Possibly the ammonia absorption traces the molecular gas at the base of an outflow which originates very close to the ultracompact H II region. In the case of G45.47+0.05, we measure a deconvolved size of 1.5"x0.8" for the region of 1.3 cm continuum emission. We detect extended emission in the NH_3(2,2) line in the vicinity of the ionized gas. Compact absorption is detected in both the (2,2) and (4,4) line against the 1.3 cm continuum. The absorption line data indicate T_rot=59 K and N(NH_3)=1.8x10^17 cm^-2. The ammonia absorption occurs at a velocity redshifted by about 3.5 km s^-1 with respect to the emission. This supports the hypothesis of a remnant infalling molecular core onto the ultracompact H II region.

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