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Observations of water maser sources at Arcetri

  • Giovanni Comoretto (a1), Riccardo Valdettaro (a1), Francesco Palla (a1), Jan Brand (a2), Riccardo Cesaroni (a1), Marcello Felli (a1), Enzo Natale (a3), Francesco Palagi (a3), Dario Panella (a1) and Gianni Tofani (a1) (a3)...

Abstract

We present the current activity of the Arcetri group in the field of water masers. This is mainly represented by observations with the Medicina radiotelescope, whose main outcome has been the compilation of the Arcetri Catalog and the study of time variability of selected sources. The Arcetri Catalog update reports the results of the observations carried out from January 1993 to April 2000 on a sample of 300 sources. The global properties of the complete Arcetri Catalog (including Comoretto et al. 1990, and Brand et al. 1994) are discussed. Of the 1013 sources, 937 have an IRAS counterpart within 1 arcmin from the nominal position of the maser. We establish a classification scheme based on the IRAS flux densities which allows to distinguish between water masers associated with star forming regions and late-type stars. The time variability study shows a large variety of behaviors. Generally more luminous sources present less variable emission and spectral components over a wider velocity range.

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References

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Brand, J., Cesaroni, R., Caselli, P. et al. 1994, A&AS, 103, 541
Brand, J. Baldacci, L., Engels, D. 2001, in IAU Symp. 206, Cosmic masers, Migenes, V. and Reid, M.J. eds., ASP Conference Series (this conference)
Comoretto, G., Palagi, F., Cesaroni, F., Felli, M., et al. 1990, A&AS, 84, 179
Valdettaro, R., Palla, F., Brand, J. et al. 2001a, A&A, 368, 845
Valdettaro, R., Palla, F., Brand, J. et al. 2001b, in IAU Symp. 206, Cosmic masers, Migenes, V. and Reid, M. J. eds., ASP Conference Series (this conference)

Observations of water maser sources at Arcetri

  • Giovanni Comoretto (a1), Riccardo Valdettaro (a1), Francesco Palla (a1), Jan Brand (a2), Riccardo Cesaroni (a1), Marcello Felli (a1), Enzo Natale (a3), Francesco Palagi (a3), Dario Panella (a1) and Gianni Tofani (a1) (a3)...

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