Journal
ASTRONOMY & ASTROPHYSICS
Volume 476, Issue 1, Pages 373-382Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20077804
Keywords
masers; radio lines : ISM; ISM : molecules
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Context. Water vapor emission at 22 GHz from masers associated with star- forming regions is highly variable. Aims. We present a database of up to 20 years of monitoring of a sample of 43 masers within star- forming regions. The sample covers a large range of luminosities of the associated IRAS source and is representative of the entire population of H2O masers of this type. The database forms a good starting point for any further study of H2O maser variability. Methods. The observations were obtained with the Medicina 32-m radiotelescope, at a rate of 4-5 observations per year. Results. To provide a database that can be easily accessed through the web, we give for each source: plots of the calibrated spectra, the velocity-time-flux density plot, the light curve of the integrated flux, the lower and upper envelopes of the maser emission, the mean spectrum, and the rate of the maser occurrence as a function of velocity. Figures for just one source are given in the text for representative purposes. Figures for all the sources are given in electronic form the appendix. A discussion of the main properties of the H2O variability in our sample will be presented in a forthcoming paper.
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