Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-25
Astrophys.J. 624 (2005) L49-L52
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astrophysical Journal Letters
Scientific paper
10.1086/430270
We present high resolution (0.''12 x 0.''079) observations of the ultracompact HII region G10.6-0.4 in 23 GHz radio continuum and the NH3(3,3) line. Our data show that the infall in the molecular material is largely spherical, and does not flatten into a molecular disk at radii as small as 0.03 pc. The spherical infall in the molecular gas matches in location and velocity the infall seen in the ionized gas. We use a non-detection to place a stringent upper limit on the mass of an expanding molecular shell associated with pressure driven expansion of the HII region. These data support a scenario in which the molecular accretion flow passes through an ionization front and becomes an ionized accretion flow onto one or more main sequence stars, not the classical pressure-driven expansion scenario. In the continuum emission we see evidence for externally ionized clumps of molecular gas, and cavities evacuated by an outflow from the central source.
Ho Paul T. P.
Keto Eric
Sollins Peter K.
Zhang Qizhou
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