Water maser variability over 20 years in a large sample of star-forming regions: the complete database

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...

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Bibliographic Details
Published in:arXiv.org 2007-10
Main Authors: Felli, M, Brand, J, Cesaroni, R, Codella, C, Comoretto, G, S Di Franco, Massi, F, Moscadelli, L, Nesti, R, Olmi, L, Palagi, F, Panella, D, Valdettaro, R
Format: Article
Language:English
Subjects:
Emission
Flux density
Light curve
Star formation
Vapor emission
Water masers
Water vapor
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Summary: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 in the on-line appendix. A discussion of the main properties of the H2O variability in our sample will be presented in a forthcoming paper.
ISSN:2331-8422
DOI:10.48550/arxiv.0710.0790