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Water Maser Emission from the Active Nucleus in M51
Yoshiaki Hagiwara, Christian Henkel, Karl. M. Menten +1
22 GHz water vapor `kilomaser' emission is reported from the central region of the Whirlpool galaxy M 51 (NGC 5194). The red-shifted spectral features (Vlsr ~ 560 km/s), flaring du…
VLBA Observations and Effelsberg Monitoring of a Flaring Water Maser in Mrk 348
A. B. Peck, H. Falcke, C. Henkel +1
We report on single-dish monitoring as well as extremely high angular resolution observations of the flaring H2O maser in the Seyfert 2 galaxy Mrk 348. The H2O line is redshifted b…
A Flaring Megamaser in Mrk 348
A. B. Peck, H. Falcke, C. Henkel +4
We report new observations of the H2O megamaser in the Seyfert 2 galaxy Mrk 348. Following our initial detection in 2000 March using the Effelsberg 100 m telescope, re-analysis of…
Host galaxies and nuclear structure of AGN with H_2O megamasers as seen with HST
Heino Falcke, Christian Henkel, Andrew S. Wilson +1
We present results of an HST survey in Halpha and continuum filters of a sample of H_2O megamaser galaxies compiled by Braatz et al., all of which contain AGN. These observations a…