Hydrodynamical backflow in X-shaped radio galaxy PKS 2014−55

dc.contributor.authorCotton, W.D.
dc.contributor.authorThorat, Kshitij
dc.contributor.authorCondon, J.J.ser
dc.contributor.authorFrank, B.S.
dc.contributor.authorJozsa, Gyula I.G.
dc.contributor.authorWhite, Sarah V.
dc.contributor.authorDeane, Roger
dc.contributor.authorOozeer, N.
dc.contributor.authorAtemkeng, M.
dc.contributor.authorBester, L.
dc.contributor.authorFanaroff, B.
dc.contributor.authorKupa, R.S.
dc.contributor.authorSmirnov, Oleg M.
dc.contributor.authorMauch, T.
dc.contributor.authorKrishnan, V.
dc.contributor.authorCamilo, F.
dc.date.accessioned2020-12-23T08:46:28Z
dc.date.available2020-12-23T08:46:28Z
dc.date.issued2020-06
dc.description.abstractWe present MeerKAT 1.28 GHz total-intensity, polarization, and spectral-index images covering the giant (projected length l ≈ 1.57 Mpc) X-shaped radio source PKS 2014−55 with an unprecedented combination of brightness sensitivity and angular resolution. They show the clear ‘double boomerang’ morphology of hydrodynamical backflows from the straight main jets deflected by the large and oblique hot-gas halo of the host galaxy PGC 064440. The magnetic field orientation in PKS 2014−55 follows the flow lines from the jets through the secondary wings. The radio source is embedded in faint (Tb ≈ 0.5 K) cocoons having the uniform brightness temperature and sharp outer edges characteristic of subsonic expansion into the ambient intragroup medium. The position angle of the much smaller (l ∼ 25 kpc) restarted central source is within 5◦ of the main jets, ruling out models that invoke jet re-orientation or two independent jets. Compression and turbulence in the backflows probably produce the irregular and low polarization bright region behind the apex of each boomerang as well as several features in the flow with bright heads and dark tails.en_ZA
dc.description.departmentPhysicsen_ZA
dc.description.librarianpm2020en_ZA
dc.description.urihttps://academic.oup.com/mnrasen_ZA
dc.identifier.citationCotton, W.D., Thorat, K., Condon, F.F. et al. 2020, 'Hydrodynamical backflow in X-shaped radio galaxy PKS 2014−55', Monthly Notices of the Royal Astronomical Society, vol. 495, no. 1, pp. 1271-1283.en_ZA
dc.identifier.issn0035-8711 (print)
dc.identifier.issn1365-2966 (online)
dc.identifier.other10.1093/mnras/staa1240
dc.identifier.urihttp://hdl.handle.net/2263/77495
dc.language.isoenen_ZA
dc.publisherOxford University Pressen_ZA
dc.rights© The Author(s) 2020. Published by Oxford University Press on behalf of The Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/).en_ZA
dc.subjectHydrodynamics – ISMen_ZA
dc.subjectIndividual objectsen_ZA
dc.subjectPGC 064440 – galaxiesen_ZA
dc.subjectActive – galaxiesen_ZA
dc.subjectJets – radio continuumen_ZA
dc.subjectGalaxies – radio linesen_ZA
dc.subjectGalaxiesen_ZA
dc.subjectMeerKAT radio telescope
dc.titleHydrodynamical backflow in X-shaped radio galaxy PKS 2014−55en_ZA
dc.typeArticleen_ZA

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