Abstract

We present deep images of the kpc-scale radio continuum emission in 14 edge-on galaxies (ten Seyfert and four starburst galaxies). Observations were taken with the VLA at 4.9 GHz (6 cm). The Seyfert galaxies were selected from a distance-limited sample of 22 objects (defined in paper I). The starburst galaxies were selected to be well-matched to the Seyferts in radio power, recessional velocity and inclination angle. All four starburst galaxies have a very bright disk component and one (NGC 3044) has a radio halo that extends several kpc out of the galaxy plane. Six of the ten Seyferts observed have large-scale (radial extent ~>1 kpc) radio structures extending outward from the nuclear region, indicating that large-scale outflows are quite common in Seyferts. Large-scale radio sources in Seyferts are similar in radio power and radial extent to radio halos in edge-on starburst galaxies, but their morphologies do not resemble spherical halos observed in starburst galaxies. The sources have diffuse morphologies, but, in general, they are oriented at skewed angles with respect to the galaxy minor axes. This result is most easily understood if the outflows are AGN-driven jets that are somehow diverted away from the galaxy disk on scales ~>1 kpc. Starburst-driven winds, however, cannot be ruled out. More observational work is needed to determine whether massive star formation is present at high enough rates to drive galactic winds out to kpc scales in Seyfert galaxies (Refer to PDF file for exact formulas).

Publication Date

8-20-1996

Comments

Also archived in: arXiv: astro-ph/9604022 v1 3 Apr 1996 E.J.M.C. would like to thank Michael Dahlem, Alan Roy, and Brian Rush for providing helpful information and for useful discussions. E.J.M.C. thanks the Director’s Office of the Space Telescope Institute 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. 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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