Probing Bright-Rimmed Clouds Through Ammonia Inversion Transitions

Details Probing Bright-Rimmed Clouds Through Ammonia Inversion Transitions Probing Bright-Rimmed Clouds Through Ammonia Inversion Transitions

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21333703f&link_type=abstract

American Astronomical Society, AAS Meeting #213, #337.03; Bulletin of the American Astronomical Society, Vol. 41, p.399

Astronomy and Astrophysics

Astronomy

Scientific paper

The last few years have yielded a wealth of new observations of bright-rimmed clouds (BRCs). A multi-wavelength approach to the study of these potential triggered star-forming regions has revealed a population of dynamically active intermediate- to high-mass early-phase protostars. Careful analysis of these sources may directly link their formation to the expansion of the HII regions around which they are located.
We present observations of the NH3 (J,K) = (1,1) and (2,2) inversion transitions which show that the majority of the observed clouds are sites of dynamical activity. The observed dynamical activity is currently poorly defined, although there may be suggestions that it is linked to the external ionisation of the BRCs.
We compare and contrast these ammonia observations with earlier radio observations of the ionised boundary layer separating the HII region from the molecular gas surrounding the embedded cores and with IR observations of the associated photon dominated region. The NH3 observations support the conclusions of Morgan et al. (2008) and earlier indications by Sugitani et al. (1991) and Yamaguchi et al. (1999) that BRCs are generally hosts to intermediate- to high-mass protostars.

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