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Evidence and Implications of Anisotropy in AGN
Ismael Pérez-Fournon, Instituto de Astrofísica de Canarias, 38200, La Laguna, Tenerife, Spain,
Baltasar Vila-Vilaó, Instituto de Astrofísica de Canarias, 38200, La Laguna, Tenerife, Spain,
José A. Acosta-Pulido, Instituto de Astrofísica de Canarias, 38200, La Laguna, Tenerife, Spain,
J. Ignacio González-Serrano, Departamento de Física Teórica, Universidad de Cantabria, Santander, Spain,
Marc Balcells, Observatorio del Roque de los Muchachos, La Palma, Tenerife, Spain,
Andrew S. Wilson, Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, U.S.A.,
Zlatan Tsvetanov, Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, U.S.A.
We present and discuss the results of long-slit spectroscopic observations of the extended emission line regions (EELR) in NGC4388, a Seyfert 2 galaxy in which extended, off-nuclear broad Hα emission (FWZI ≈ 4000 km s−1) has been reported (Shields & Filippenko 1988). These features have been interpreted as scattered radiation from a Seyfert 1 nucleus that is obscured along our line of sight. Our spectroscopic observations cover a large fraction of the inner part of the EELR, including some of the positions where the presence of broad lines has been claimed. Broad wings in the Hα + [NII] λλ6548, 6583 complex are also present in our data but they can be explained by the superposition of several narrow components. However, we cannot, at present, exclude the possibility that an intrinsically broad component to Hα exists at some locations. The implications of our results for unified models of Seyfert galaxies are briefly discussed.
NGC4388 is a high-inclination Seyfert 2 galaxy with bright EELR (Colina et al. 1987, Pogge 1988, Corbin et al. 1988). Radio observations reveal a double-peaked source close to the apparent optical nucleus and more extended emission aligned roughly perpendicular to the galaxy disk (Stone et al. 1988, Hummel & Saikia 1991). The axis of the cone-like, high-excitation gas is almost perpendicular to the galaxy disk and close to that of the extended radio emission (Pogge 1988, Corbin et al. 1988), suggesting that the EELR are photoionized by nuclear radiation which escapes preferentially along and around the radio axis.
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