High-frequency carbon recombination line as a probe to study the environment of Ultra-compact HII regions
Abstract
The far-ultra violet (6 - 13.6 eV) photons from the OB stars in Ultra-compact HII regions (UCHs) produce photo-dissociation regions (PDRs) at the interface between the ionized and the natal molecular material. In this paper, we show that carbon recombination lines (CRLs) at frequencies greater than a few GHz are detectable from these PDRs and such observations can be used to: (1) estimate the physical properties of the PDR material; (2) study the kinematics of the PDR material relative to the HII region gas; (3) constrain the magnetic fields in the vicinity of UCHs and (4) address the lifetime problem of UCHs.
- Publication:
-
Triggered Star Formation in a Turbulent ISM
- Pub Date:
- 2007
- DOI:
- 10.1017/S1743921307002578
- Bibcode:
- 2007IAUS..237..469R
- Keywords:
-
- HII regions;
- ISM: magnetic fields;
- radio lines: ISM;
- stars: formation