Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.276...57c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 276, Issue 1, pp. 57-73.
Astronomy and Astrophysics
Astronomy
46
Masers, Stars: Formation, Ism: Molecules, Infrared: Ism: Continuum, Radio Lines: Ism
Scientific paper
The results of the analysis of the occurrence of 22.2-GHz H_2O maser emission in a sample of 1409 IRAS sources north of declination -30 deg associated with star-forming regions are presented. Our sample contains all the IRAS sources that satisfy Emerson criteria for selecting molecular cores associated with the earliest evolutionary stages of the star-forming process. In a previous paper, we have reported the results of the observations of about one third of the sample. In the present paper the observations of the remaining IRAS sources are presented: 18 of them are newly detected maser sources. The results show that 20 per cent of all IRAS sources that satisfy the Wood & Churchwell criteria have H_2O water masers. This is in agreement with the assumption that these criteria select objects that are connected with the early phases of the evolution of high-mass star-forming regions. Moreover, about one third of the whole sample selected according to Emerson criteria contains IRAS sources that are not associated with massive star-forming processes, but probably with molecular cores in low-mass star-forming regions.
Attolini M. R.
Caselli Paola
Codella Claudio
Palumbo Giorgio G. C.
Pareschi Giovanni
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