Abstract
In nearby and distant active galactic nuclei (AGNs), water (mega)masers can be used to determine the accretion disk geometry and precise black hole masses, and standard-candles-independent distances to the host galaxy (disk-masers), to provide important information about the evolution of jets (jet-masers), and to trace the velocity and geometry of nuclear winds (outflow-masers). In the following, we report on the main outcome of our recent study, performed with the VLBA and EVN networks, of the water gigamaser in TXS2226-184. Our analysis indicates an association of the maser emission with a luminous radio knot in the nuclear region of the galaxy, seemingly part of a large scale radio jet, hence supporting a jet/outflow nature of the maser. In addition, we present new multi-frequency radio-continuum EVN observations of the innermost region of TXS2226-184 aimed at gaining a clearer picture of the nuclear individual components of the AGN and determining a more precise location of the supermassive black hole SMBH.
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