Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995yera.conf....2c&link_type=abstract
The XXVIIth Young European Radio Astronomers Conference, ed. D.A. Green and W. Steffen, in association with Cambridge University
Astronomy and Astrophysics
Astronomy
Scientific paper
The nature of 160 IRAS sources has been investigated through a search for water maser emission at 22.2 GHz. These IRAS sources have been selected using the Wood & Churchwell (1989) colour criteria to identify high-mass star forming regions. Out of the whole sample 11 water masers have been detected, 2 for the first time. Therefore, our detection rate is very low: 7%. There is a strong dependence of the detection rate on the intensity at IRAS 60-micron flux density: it decreases from 24% for sources brighter than 100 Jy to 1% for weaker sources. If one considers only the bright sources, the detection rate does not depend on the IRAS colours. However, there is a net distinction for the weak sources: the detection rate is 11% for sources with [60-25] micron colour greater than 0.61 and 1% for the rest. These results, combined with those found in previous surveys, indicate that it is very unlikely that the population of weak IRAS sources with shallow far-infrared continuum spectra is associated with high-mass star forming regions. As a consequence, the population of O-type stars estimated from the number of IRAS sources located inside the Wood & Churchwell (1989) colour box may be overestimated.
Codella Claudio
Palla Francesco Palla
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