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The Abundance of X-Shaped Radio Sources I. VLA Survey of 52 Sources With Off-Axis Distortions | | David H. Roberts
; Jake P. Cohen
; Jing Lu
; Lakshmi Saripalli
; Ravi Subrahmanyan
; | | Date: |
6 Mar 2015 | | Abstract: | Cheung (2007) identified a sample of 100 candidate X-shaped radio galaxies
using the NRAO FIRST survey; these are small-axial-ratio extended radio sources
with off-axis emission. Here we present radio images of 52 of these sources
that have been made from archival Very Large Array data with resolution of
about 1 arcsec. Fifty-one of the 52 were observed at 1.4 GHz, seven were
observed at 1.4 GHz and 5 GHz, and one was observed only at 5 GHz. We also
present overlays of the SDSS red images for 41 of the sources, and DSS II
overlays for the remainder. Optical counterparts have been identified for most
sources, but there remain a few empty fields.
Our higher resolution VLA images along with FIRST survey images of the
sources in the sample reveal that extended extragalactic radio sources with
small axial ratios are largely (60%) cases of double radio sources with twin
lobes that have off-axis extensions, usually with inversion-symmetric
structure. The available radio images indicate that at most 20% sources might
be genuine X-shaped radio sources that could have formed by a restarting of
beams in a new direction following an interruption and axis flip. The remaining
20% are in neither of these categories. The implications of this result for the
gravitational wave background are discussed in Roberts, Saripalli, and
Subrahmanyan (2015). | | Source: | arXiv, 1503.2017 | | Services: | Forum | Review | PDF | Favorites | |
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