All's Knot Quiet on the Recombination Front

Details All's Knot Quiet on the Recombination Front All's Knot Quiet on the Recombination Front

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.233..195r&link_type=abstract

Astrophysics and Space Science, Volume 233, Issue 1-2, pp. 195-198

Astronomy and Astrophysics

Astrophysics

3

Scientific paper

Molecular clouds are clumpy on length scales down to the limits of observational resolution. At least some ultracompact Hii regions (UCH iiR) may result from the interaction of a young early type star and this type of cloud. The clumps can act as reservoirs of ionized gas distributed within the Hii region. These models reproduce the relatively long lifetimes implied by the population statistics of UCH iiR. We present line profile and emission measure plots based on the simplest case where the flow remains supersonic through to a recombination front. The morphology agrees with the shell-like UCH iiR as classified by Churchwell. The predicted line profiles are broad and double peaked with a separation of about 50 km s-1 for the example given.

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