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We conducted phase-referenced VLBA observations at 1.7–22 GHz for the type-2 Seyfert galaxy Mrk 348 (D = 62 Mpc) which has water vapor megamasers of very broad line width (∼ 100 km s−1). The physical origin of the broad-line masers has been debated. We investigated (1) the position-velocity distribution of the masers, (2) a frequency-dependent core shift, and (3) the opacity distribution of free-free absorption in the nuclear region of Mrk 348. In this paper, we report some observational results. The details of the maser velocity field (with infall and rotation), the enclosed mass and the location of the dynamical center, and the structure of the circumnuclear ionized torus will be presented in another paper.

Water vapor megamasers in a circumnuclear ionized torus in the Seyfert galaxy Mrk 348