Large-scale outflows in edge-on Seyfert galaxies. I. Optical emission-line imaging and optical spectroscopy

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Title: Large-scale outflows in edge-on Seyfert galaxies. I. Optical emission-line imaging and optical spectroscopy
Author: Colbert, Edward; Baum, Stefi; Gallimore, Jack; O'Dea, Christopher; Lehnert, Matthew; Tsvetanov, Zlatan; Mulchaey, John; Caganoff, Saul
Abstract: We have launched a search for large-scale (>1 kpc) minor axis outflows in edge-on Seyfert galaxies in order to assess their frequency of occurrence and to study their properties. Here we present optical continuum and Halpha + [N II] line images and/or minor axis long-slit spectra of 22 edge-on Seyfert galaxies. Six of these galaxies show at least one of the following: (i) bi-symmetric Halpha halos extending along the minor axis, (ii) bright emission-line complexes at distances > 4 kpc (in projection) out of the disk, and (iii) double-peaked emission- line profiles from the gas along the minor axis, suggesting that a windblown bubble is present. Our results indicate that > 1/4 of Seyfert galaxies have good evidence for minor axis galactic outflows. Kinetic luminosities of the galactic outflows in our sample Seyfert galaxies are ~10^40^-10^42^ ergs s^-1^, assuming all the observed minor axis emission is produced by the outflow. These values are, in general, ~0.1 as large as those well-studied cases of superwinds in starburst galaxies (Heckman, Armus, & Miley 1990). However, far-infrared luminosities of our sample Seyfert galaxies are also ~0.1 as large. Both starburst-driven superwinds and wide-angled outflows from the active galactic nucleus are possible explanations for the observed large-scale outflows (Refer to PDF file for exact formulas).
Description: Also archived in: arxiv: astro-ph/9512169
Record URI: http://hdl.handle.net/1850/1818
Date: 1996-07

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