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We present a study of the radial velocity offsets between narrow emissionlines and host galaxy lines (stellar absorption and H I 21-cm emission) inSeyfert galaxies with observed redshifts less than 0.043. We find that 35% ofthe Seyferts in the sample show [O III] emission lines with blueshifts withrespect to their host galaxies exceeding 50 km/s, whereas only 6% showredshifts this large, in qualitative agreement with most previous studies. Wealso find that a greater percentage of Seyfert 1 galaxies show blueshifts thanSeyfert 2 galaxies. Using HST/STIS spatially-resolved spectra of the Seyfert 2galaxy NGC 1068 and the Seyfert 1 galaxy NGC 4151, we generate geometric modelsof their narrow-line regions (NLRs) and inner galactic disks, and show howthese models can explain the blueshifted [O III] emission lines in collapsedSTIS spectra of these two Seyferts. We conclude that the combination of massoutflow of ionized gas in the NLR and extinction by dust in the inner disk(primarily in the form of dust spirals) is primarily responsible for thevelocity offsets in Seyfert galaxies. More exotic explanations are not needed.We discuss the implications of this result for the velocity offsets found inhigher redshift AGN.

Radial Velocity Offsets Due to Mass Outflows and Extinction in Active Galactic Nuclei