Volume 476, Number 1, December II 2007
|Page(s)||373 - 664|
|Section||Online catalogs and data|
|Published online||02 October 2007|
Water maser variability over 20 years in a large sample of star-forming regions: the complete database*
INAF – Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy e-mail: email@example.com
2 INAF – Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy
3 INAF – Istituto di Radioastronomia, Sez. di Firenze, Largo E. Fermi 5, 50125 Firenze, Italy
4 Dipartimento di Astronomia, Università degli Studi di Firenze, Largo E. Fermi 2, 50125 Firenze, Italy
Accepted: 3 July 2007
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.
Key words: masers / radio lines: ISM / ISM: molecules
© ESO, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.