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We present the results of a Hubble Space Telescope (HST) survey of extended[OIII] emission in a sample of 60 nearby Seyfert galaxies (22 Seyfert 1's and38 Seyfert 2's), selected by mostly isotropic properties. The comparisonbetween the semi major axis size of their [OIII] emitting regions (R_Maj) showsthat Seyfert 1's and Seyfert 2's have similar distributions, which seems tocontradict Unified Model predictions. We discuss possible ways to explain thisresult, which could be due either to observational limitations or the modelsused for the comparison with our data. We show that Seyfert 1 Narrow LineRegions (NLR's) are more circular and concentrated than Seyfert 2's, which canbe attributed to foreshortening in the former. We find a good correlationbetween the NLR size and luminosity, following the relation R_Maj proptoL([OIII])^0.33, which is flatter than a previous one found for QSO's andSeyfert 2's. We discuss possible reasons for the different results, and theirimplications to photoionization models. We confirm previous results which showthat the [OIII] and radio emission are well aligned, and also find nocorrelation between the orientation of the extended [OIII] emission and thehost galaxy major axis. This agrees with results showing that the torus axisand radio jet are not aligned with the host galaxy rotation axis, indicatingthat the orientation of the gas in the torus, and not the spin of the blackhole, determine the orientation of the accretion disk, and consequently theorientation of the radio jet.Comment: 17 pages including 12 figures, to appear in Ap

AHubble Space TelescopeSurvey of Extended [Oiii] λ5007 A Emission in a Far‐Infrared–Selected Sample of Seyfert Galaxies: Results