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2009MNRAS.399..861L - Mon. Not. R. Astron. Soc., 399, 861-877 (2009/October-3)
Too large and overlooked{quest} extended free-free emission towards massive star formation regions.
LONGMORE S.N., BURTON M.G., KETO E., KURTZ S. and WALSH A.J.
Abstract (from CDS):
We consider the implications that a significant number of these extended Hii regions may have been missed by previous surveys of massive star formation regions. If the original sample of 21 sources is representative of the population as a whole, the fact that six contain previously undetected extended free-free emission suggests a large number of regions have been mis-classified. Rather than being very young objects prior to UCHii region formation, they are, in fact, associated with extended Hii regions and thus significantly older. In addition, inadvertently ignoring a potentially substantial flux contribution (up to ∼0.5Jy) from free-free emission has implications for dust masses derived from sub-mm flux densities. The large spatial scales probed by single-dish telescopes, which do not suffer from spatial filtering, are particularly susceptible and dust masses may be overestimated by up to a factor of ∼2.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): stars: early-type - stars: evolution - stars: formation - ISM: evolution - Hii regions - radio continuum: ISM - radio lines: ISM
Simbad objects: 11
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