FIRST `Winged' and `X'-shaped Radio Source Candidates

Abstract

A small number of double-lobed radio galaxies (17 from our own census of the literature) show an additional pair of low surface brightness `wings', thus forming an overall `X'-shaped appearance. The origin of the wings in these radio sources is unclear. They may be the result of back-flowing plasma from the currently active radio lobes into an asymmetric medium surrounding the active nucleus, which would make these ideal systems in which to study thermal/non-thermal plasma interactions in extragalactic radio sources. Another possibility is that the wings are the aging radio lobes left over after a (rapid) realignment of the central supermassive black-hole/accretion disk system due perhaps to a merger. Generally, these models are not well tested; with the small number of known examples, previous works focused on detailed case studies of selected sources with little attempt at a systematic study of a large sample. Using the VLA-FIRST survey database, we are compiling a large sample of winged and X-shaped radio sources for such studies. As a first step toward this goal, an initial sample of 100 new candidate objects of this type are presented in this paper. ...[abridged]

(all comments same as v2 except updated external link) AJ, accepted. 36 pgs. Added low resolution figures but table 2 still incomplete. Otherwise, unchanged from previous astro-ph version. For complete version and table 2: http://www.slac.stanford.edu/~teddy/Preprints/xshaped.pdf.gz

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