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A VLBA-uGMRT search for candidate binary black holes: study of six X-shaped radio galaxies with double-peaked emission lines

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dc.contributor.author Sebastian, Biny
dc.contributor.author Caproni, Anderson
dc.contributor.author Kharb, Preeti
dc.contributor.author Nayana, A. J
dc.contributor.author Ali, Arshi
dc.contributor.author Rubinur, K
dc.contributor.author O Dea, Christopher P
dc.contributor.author Baum, Stefi
dc.contributor.author Nandi, Sumana
dc.date.accessioned 2024-06-28T08:52:06Z
dc.date.available 2024-06-28T08:52:06Z
dc.date.issued 2024-06
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 530, No. 4, pp. 4902–4919 en_US
dc.identifier.issn 0035-8711
dc.identifier.uri http://hdl.handle.net/2248/8496
dc.description Open Access. en_US
dc.description This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.description.abstract Identifying methods to discover dual active galactic nucleus (AGN) has proven to be challenging. Several indirect tracers have been explored in the literature, including X/S-shaped radio morphologies and double-peaked (DP) emission lines in the optical spectra. However, the detection rates of confirmed dual AGN candidates from the individual methods remain extremely small. We search for binary black holes (BBH) in a sample of six sources that exhibit both X-shaped radio morphology and DP emission lines using the Very Long Baseline Array (VLBA). Three out of the six sources show dual VLBA compact components, making them strong candidates for BBH sources. In addition, we present deep uGMRT images revealing the exquisite details of the X-shaped wings in three sources. We present a detailed precession modeling analysis of these sources. The black hole separations estimated from the simplistic geodetic precession model are incompatible with those estimated from emission line offsets and the VLBA separations. However, precession induced by a non-coplanar secondary black hole is a feasible mechanism for explaining the observed X-shaped radio morphologies and the black hole separations estimated from other methods. The black hole separations estimated from the double-peaked emission lines agree well with the VLBA compact component separations. Future multifrequency VLBA observations will be critical in ruling out or confirming the BBH scenario in the three galaxies with dual component detections. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of Royal Astronomical Society en_US
dc.relation.uri https://doi.org/10.1093/mnras/stae546
dc.rights © 2024 The Author(s)
dc.subject Galaxies: active en_US
dc.subject Galaxies: jets en_US
dc.subject Quasars: emission lines en_US
dc.subject Radio continuum: galaxies en_US
dc.title A VLBA-uGMRT search for candidate binary black holes: study of six X-shaped radio galaxies with double-peaked emission lines en_US
dc.type Article en_US


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