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2001MNRAS.326...36W - Mon. Not. R. Astron. Soc., 326, 36-56 (2001/September-1)
Mid-infrared observations of methanol maser sites and ultracompact HII regions: signposts of high-mass star formation.
WALSH A.J., BERTOLDI F., BURTON M.G. and NIKOLA T.
Abstract (from CDS):
Based on an average infrared spectral energy distribution, we deduce that the MIR objects are luminous enough that they should also produce a strong ionizing radiation. Some sources are consistent with stars of later spectral type, but not all can be. A number of maser sites show no detectable radio continuum emission associated with MIR emission, despite a powering source luminous enough potentially to produce an UC Hii region. Since no signs of an UC Hii region are detected here, these maser sites might be produced during a very early stage of stellar evolution.
We present objects that show evidence of outflow activity stemming from a maser site, exhibiting CO and/or CS line profiles indicative of outflows coincident with the MIR source. These cases are promising examples of maser sites signposting the earliest stages of high-mass star formation.
Abstract Copyright: The Royal Astronomical Society
Journal keyword(s): masers - stars: formation - Hii regions - infrared: ISM
Nomenclature: Table 1: [WBB2001] NN (Nos 1-55).
Simbad objects: 100