H2O masers associated with dense molecular clouds and ultracompact H II regions. 2: The extended sample

Details H2O masers associated with dense molecular clouds and ultracompact H II regions. 2: The extended sample H2O masers associated with dense molecular clouds and ultracompact H II regions. 2: The extended sample

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...280..599p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 280, no. 2, p. 599-608

Astronomy and Astrophysics

Astrophysics

47

H Ii Regions, Interstellar Masers, Molecular Clouds, Radio Spectra, Star Formation, Water Masers, Color, Histograms, Luminosity, Spectrum Analysis

Scientific paper

We present water maser observations towards a sample of candidate compact molecular cores selected on the basis of their far-infrared colors according to the criteria specified in a previous paper (Palla et al. 1991). We have extended our initial sample to objects with flux at 60 micrometers below 100 Jy. Our results confirm the existence of a sharp cutoff in H2O detections for log(base 10) (F25/F12) less than 0.57. We demonstrate that sources above this threshold are likely to be associated with ultracompact H II regions, whereas the rest of the sample is probably made of high mass (proto) stars with only a minor contamination of young H II regions.

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