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Paper: VLBA Observations and Effelsberg Monitoring of a Flaring Water Maser in Mrk 348
Volume: 249, The Central Kiloparsec of Starbursts and AGN: the La Palma Connection
Page: 321
Authors: Peck, A. B.; Falcke, H.; Henkel, C.; Menten, K. M.
Abstract: 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 by ~130 km s-1 with respect to the systemic velocity, is very broad, with an FWHM of 130 km s-1, and has no detectable high-velocity components within 1500 kms-1 on either side of the strong line. Monitoring observations made with the Effelsberg 100 m telescope show that the maser varies significantly on timescales as short as one day. VLBA observations indicate that the maser emission arises entirely from a region less than 0.25 pc in extent, located toward a continuum component thought to be associated with the receding jet.
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