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).

Publication Date

1996

Comments

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.

Document Type

Article

Department, Program, or Center

School of Physics and Astronomy (COS)

Campus

RIT – Main Campus

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