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High-frequency carbon recombination line as a probe to study the environment of Ultra-compact HII regions

Published online by Cambridge University Press:  01 August 2006

D. Anish Roshi
D. Anish Roshi*
Affiliation:
Raman Research Institute, Sadashivanagar, Bangalore 560080, India email: anish@rri.res.in
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Abstract

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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.

Keywords

HII regionsISM: magnetic fieldsradio lines: ISMstars: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S237: Triggered Star Formation in a Turbulent ISM , August 2006 , pp. 469
Copyright
Copyright © International Astronomical Union 2007

References

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Roshi, D. A., Goss, W. M., Anantharamaiah, K. R., & Jeyakumar, S. 2005, ApJ 626, 253CrossRefGoogle Scholar