Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983stin...8417076a&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
Flux Density, Orion Nebula, Radio Astronomy, Variability, Water Masers, Linear Polarization, Molecular Clouds, Very Long Base Interferometry
Scientific paper
In August 1979 the build up of a new water maser source in Orion began and because of its proximity, became the strongest source in the sky. The maser was first detected in a VLBI experiment. The 1/8 km s feature belongs to a group of maser sources expanding with a velocity of 1/18 km s from a center that coincides with the infrared source IRc2. During the period of maximum activity, between October 1979 and August 1980, the flux density reached the value of 2.3 million Jy. The high degree of linear polarization (30 to 60%) put some constraints on the physical parameters of the maser. The discovery of a new rapidly recurring outburst in October-November 1983 with time scales of variation shorter than 5 hours is reported. Single dish observations of this source during the past four years are presented and a model of the flaring region that is consistent with the results of interferometric observations is discussed.
Abraham Zulema
Cancoro C. O. A.
del Ciampo L. F.
Vilas-Boas Jose W. S.
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