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dc.contributor.authorMahatma, V. H.
dc.contributor.authorHardcastle, M. J.
dc.contributor.authorWilliams, W. L.
dc.contributor.authorBest, P. N.
dc.contributor.authorCroston, J. H.
dc.contributor.authorDuncan, K.
dc.contributor.authorMingo, B.
dc.contributor.authorMorganti, R.
dc.contributor.authorBrienza, M.
dc.contributor.authorCochrane, R. K.
dc.contributor.authorGürkan, G.
dc.contributor.authorHarwood, J. J.
dc.contributor.authorJarvis, M. J.
dc.contributor.authorJamrozy, M.
dc.contributor.authorJurlin, N.
dc.contributor.authorMorabito, Leah K.
dc.contributor.authorRöttgering, H. J. A.
dc.contributor.authorSabater, J.
dc.contributor.authorShimwell, T. W.
dc.contributor.authorSmith, D. J. B.
dc.contributor.authorShulevski, A.
dc.contributor.authorTasse, C.
dc.date.accessioned2019-01-10T14:30:02Z
dc.date.available2019-01-10T14:30:02Z
dc.date.issued2018-11-20
dc.identifier.citationMahatma , V H , Hardcastle , M J , Williams , W L , Best , P N , Croston , J H , Duncan , K , Mingo , B , Morganti , R , Brienza , M , Cochrane , R K , Gürkan , G , Harwood , J J , Jarvis , M J , Jamrozy , M , Jurlin , N , Morabito , L K , Röttgering , H J A , Sabater , J , Shimwell , T W , Smith , D J B , Shulevski , A & Tasse , C 2018 , ' LoTSS DR1 : Double-double radio galaxies in the HETDEX field ' , Astronomy & Astrophysics . https://doi.org/10.1051/0004-6361/201833973
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 15712819
dc.identifier.otherPURE UUID: b1e48141-0cb9-46d0-bb9c-9101bb215f87
dc.identifier.otherArXiv: http://arxiv.org/abs/1811.08194v1
dc.identifier.urihttp://hdl.handle.net/2299/20950
dc.description20 pages, 2 tables, 54 figures. This paper is part of the LOFAR surveys data release 1 and has been accepted for publication in a special edition of A&A that will appear in Feb 2019, volume 622. The catalogues and images from the data release will be publicly available on lofar-surveys.org upon publication of the journal. Reproduced with permission from Astronomy & Astrophysics. © 2019 ESO
dc.description.abstractDouble-double radio galaxies (DDRGs) represent a short but unique phase in the life-cycle of some of the most powerful radio-loud active galactic nuclei (RLAGN). These galaxies display large-scale remnant radio plasma in the intergalactic medium left behind by a past episode of active galactic nuclei (AGN) activity, and meanwhile, the radio jets have restarted in a new episode. The knowledge of what causes the jets to switch off and restart is crucial to our understanding of galaxy evolution, while it is important to know if DDRGs form a host galaxy dichotomy relative to RLAGN. We utilised the LOFAR Two-Metre Sky Survey DR1, using a visual identification method to compile a sample of morphologically selected candidate DDRGs, showing two pairs of radio lobes. To confirm the restarted nature in each of the candidate sources, we obtained follow-up observations with the VLA at higher resolution to observe the inner lobes or restarted jets, the confirmation of which created a robust sample of 33 DDRGs. We created a comparison sample of 777 RLAGN from the DR1 catalogue, and compared the optical and infrared magnitudes and colours of their host galaxies. We find that there is no statistically significant difference in the brightness of the host galaxies between double-doubles and single-cycle RLAGN. The DDRG and RLAGN samples also have similar distributions in WISE mid-infrared colours, indicating similar ages of stellar populations and dust levels in the hosts of DDRGs. We conclude that DDRGs and 'normal' RLAGN are hosted by galaxies of the same type, and that DDRG activity is simply a normal part of the life cycle of RLAGN. Restarted jets, particularly for the class of low-excitation radio galaxies, rather than being a product of a particular event in the life of a host galaxy, must instead be caused by smaller scale changes, such as in the accretion system surrounding the black hole.en
dc.language.isoeng
dc.relation.ispartofAstronomy & Astrophysics
dc.rights/dk/atira/pure/core/openaccesspermission/open
dc.subjectastro-ph.GA
dc.subjectastro-ph.HE
dc.titleLoTSS DR1 : Double-double radio galaxies in the HETDEX fielden
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2018-09-21
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1051/0004-6361/201833973
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeopenAccess


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