LONG-SLIT SPECTROSCOPY OF 3 LOW-LUMINOSITY SEYFERT 1 GALAXIES

Medium-resolution long-slit spectroscopy of NGC 1365, NGC 6814 and NGC 7314 is presented. We obtain V(rot) = 160 km s-1 (for an uncertain i = 11-degrees) and 170 km s-1 for the galactic disks of NGC 6814 and NG C 7314, respectively. These values are normal for their blue luminosit ies according to a relation given in Rubin (1983). The apparent centra l gradients of the rotation curves are moderate and yield Keplerian es timates for the nuclear mass (inside R = 100 pc) of 10(7-8) M. and 6 x 10(6) M., respectively. These values only slightly exceed the black h ole masses estimated from broad-line properties. The nuclear narrow-li ne ratios lie within the general range of Seyferts. However, NGC 6814 exhibits a large [NII]/Halpha ratio, which can be explained by the pre sence of a high density component. Circumnuclear narrow-line velocitie s in NGC 1365 are in agreement with earlier data. While most extranucl ear line intensity ratios of [NII], [SII] (and [OI] as far as availabl e) to Ha are typical for HII-region type objects there is a region ext ending from 13'' to 30'' west of the nucleus, which exhibits [NII]lamb da6583/ Halpha = 2.6 +/- 0.3 and [SII]lambdalambda6716,6731/Halpha < 0 .4. This unusual combination can be explained by a factor of approxima tely 5 nitrogen enhancement. About 6'' southeast of the nucleus we det ected blueshifted [OIII] and an increase in [OIII]/Hbeta apparently re lated to the radiation and outflow cone invoked by others. We emphasiz e the lack of a detailed line ratio map in the cone area. To our knowl edge there is so far no unambiguous evidence for a classical Seyfert n arrow-line region in NGC 1365, although it reveals strong broad Halpha .