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).

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Also archived in: arxiv: astro-ph/9512169 E.J.M.C. thanks Sylvain Veileux and the referee, R.-J. Dettmar, for providing helpful comments. E.J.M.C. acknowledge the Director's Office of the STScI for providing funding. This research has made extensive use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, Caltech, under contract with NASA. The work of M.D.L. at IGPP/LLNL was performed under the auspices of the US Department of Energy under contract W-7405-ENG-48. This paper represents a portion of E.J.M.C.'s Ph.D. thesis, to be submitted in partial fulfillment of the requirements of the Graduate School of the University of Maryland.ISSN:1538-4365 Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.

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Department, Program, or Center

School of Physics and Astronomy (COS)


RIT – Main Campus