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Using the Effelsberg 100-m telescope, sensitive measurements of the H2Omegamaser in NGC 3079 are presented. During 2000 - 2001, `high velocity'features are seen that are red-shifted up to 225 km/s with respect to thesystemic velocity of the galaxy (about 1120 km/s). Symmetrically bracketing thesystemic velocity, the H2O emission covers a velocity range of 450 km/s withonly one potential narrow gap (20 km/s) near the systemic velocity itself.Velocity drifts of individual components are not convincingly detected. It isshown that the presence of red-shifted emission and the absence of detectablevelocity drifts are not inconsistent with the existence of a rotatingcircumnuclear maser disk at the very center of the galaxy. Significantdifferences in the overall line profile compared to NGC 4258 and a complexmorphology of the radio continuum leave, however, space for scepticism.Comment: 4 pages, including 3 figures. Astronomy and Astrophysics Letters,  accepte

Red-shifted H2O emission in NGC 3079: More evidence for a pc-scale circumnuclear torus?

Red-shifted H₂O emission in NGC 3079: More evidence for a pc-scale circumnuclear torus?