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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6375
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dc.contributor.authorRoberts, David H-
dc.contributor.authorCohen, Jake P-
dc.contributor.authorLu, Jing-
dc.contributor.authorSaripalli, Lakshmi-
dc.contributor.authorSubrahmanyan, Ravi-
dc.date.accessioned2016-01-27T08:27:27Z-
dc.date.available2016-01-27T08:27:27Z-
dc.date.issued2015-09-
dc.identifier.citationAstrophysical Journal Supplement Series , 2015, Vol.220, p7en_US
dc.identifier.issn0067-0049 (online)-
dc.identifier.urihttp://hdl.handle.net/2289/6375-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en_US
dc.description.abstractCheung 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''. Fifty-one of the 52 were observed at 1.4 GHz, 7 were observed at 1.4 and 5 GHz, and 1 was observed only at 5 GHz. We also present overlays of the Sloan Digital Sky Survey red images for 48 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% of 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 et al.en_US
dc.language.isoenen_US
dc.publisherIOP Sciences for The American Astronomical Societyen_US
dc.relation.urihttp://adsabs.harvard.edu/abs/2015ApJS..220....7Ren_US
dc.relation.urihttp://arxiv.org/abs/1503.02017en_US
dc.relation.urihttp://dx.doi.org/10.1088/0067-0049/220/1/7en_US
dc.rights2015 American Astronomical Society.en_US
dc.titleThe abundance of x-shaped radio sources. i. VLA survey of 52 sources with off-axis distortionsen_US
dc.typeArticleen_US
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