Nature of X-shaped sources

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dc.creatorLal, D. V.
dc.creatorHardcastle, M. J.
dc.creatorKraft, R. P.
dc.creatorCheung, C. C.
dc.creatorLobanov, A. P.
dc.creatorZensus, J. A.
dc.creatorBhatnagar, S.
dc.creatorRao, A. P.
dc.date2009-04-17
dc.date.accessioned2026-07-07T13:05:42Z
dc.date.available2026-07-07T13:05:42Z
dc.descriptionThe nature of X-shaped sources is a matter of considerable debate: it has even been proposed that they provide evidence for black hole mergers$ / $spin reorientation, and therefore constrain the rate of strong gravitational wave events (Merritt & Ekers 2002). Based on morphological and spectral characteristics of these sources, currently a strong contender to explain the nature of these sources is the `alternative' model of Lal & Rao (2007), in which these sources consist of two pairs of jets, which are associated with two unresolved AGNs. Detailed morphological and spectral results on milliarcsecond-scales (mas) provide a crucial test of this model, and hence these sources are excellent candidates to study on mas; {\it i.e.}, to detect he presence/absence of double nuclei/AGNs, signs of helical/disrupted jets, thereby, to investigate spatially resolved/unresolved binary AGN systems and providing clues to understanding the physics of merging of AGNs on mas. We conducted a systematic study of a large sample of known X-shaped, comparison FR II radio galaxies, and newly discovered X-shaped candidate sources using Giant Metrewave Radio Telescope and Very Large Array at several radio frequencies. In our new observations of `comparison' FR II radio galaxies we find that almost all of our targets show standard spectral steepening as a function of distance from the hotspot. However, one source, 3C 321, has a low-surface-brightness extension that shows a flatter spectral index than the high-surface-brightness hotspots$ / $lobes, as found in `known' X-shaped sources.
dc.descriptionTo appear in the proceedings of the Conference "The Central Kiloparsec: Active Galactic Nuclei and Their Hosts", Ierapetra 4-6 June 2008, Greece, Memorie della Societa Astronomica Italiana
dc.identifierhttps://arxiv.org/abs/0904.2725
dc.identifierhttp://arxiv.org/abs/0904.2725
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/227575
dc.subjectCosmology and Nongalactic Astrophysics
dc.titleNature of X-shaped sources
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