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dc.contributor.authorMorabito, Leah K.
dc.contributor.authorWilliams, W. L.
dc.contributor.authorDuncan, Kenneth J.
dc.contributor.authorRöttgering, H.~J.~A.
dc.contributor.authorMiley, George
dc.contributor.authorSaxena, Aayush
dc.contributor.authorBarthel, Peter
dc.contributor.authorBest, Philip N.
dc.contributor.authorBruggen, M.
dc.contributor.authorBrunetti, G.
dc.contributor.authorChyży, K. T.
dc.contributor.authorEngels, D.
dc.contributor.authorHardcastle, M. J.
dc.contributor.authorHarwood, J. J.
dc.contributor.authorJarvis, Matt J.
dc.contributor.authorMahony, E. K.
dc.contributor.authorPrandoni, I.
dc.contributor.authorShimwell, Timothy W.
dc.contributor.authorShulevski, Alexander
dc.contributor.authorTasse, C.
dc.date.accessioned2017-08-03T14:20:28Z
dc.date.available2017-08-03T14:20:28Z
dc.date.issued2017-08-01
dc.identifier.citationMorabito , L K , Williams , W L , Duncan , K J , Röttgering , H J A , Miley , G , Saxena , A , Barthel , P , Best , P N , Bruggen , M , Brunetti , G , Chyży , K T , Engels , D , Hardcastle , M J , Harwood , J J , Jarvis , M J , Mahony , E K , Prandoni , I , Shimwell , T W , Shulevski , A & Tasse , C 2017 , ' Investigating the Unification of LOFAR-detected powerful AGN in the Boötes Field ' , Monthly Notices of the Royal Astronomical Society , vol. 469 , no. 2 , pp. 1883-1896 . https://doi.org/10.1093/mnras/stx959
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 11841875
dc.identifier.otherPURE UUID: e556768a-cb32-4db9-92f7-448f6a75cd85
dc.identifier.otherArXiv: http://arxiv.org/abs/1704.06267v1
dc.identifier.otherORCID: /0000-0003-0251-6126/work/62748334
dc.identifier.otherORCID: /0000-0001-7315-1596/work/42124904
dc.identifier.otherScopus: 85086111779
dc.identifier.urihttp://hdl.handle.net/2299/19113
dc.descriptionThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. ©:2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.description.abstractLow radio frequency surveys are important for testing unified models of radio-loud quasars and radio galaxies. Intrinsically similar sources that are randomly oriented on the sky will have different projected linear sizes. Measuring the projected linear sizes of these sources provides an indication of their orientation. Steep-spectrum isotropic radio emission allows for orientation-free sample selection at low radio frequencies. We use a new radio survey of the Bo\"otes field at 150 MHz made with the Low Frequency Array (LOFAR) to select a sample of radio sources. We identify 44 radio galaxies and 16 quasars with powers $P>10^{25.5}$ W Hz$^{-1}$ at 150 MHz using cross-matched multi-wavelength information from the AGN and Galaxy Evolution Survey (AGES), which provides spectroscopic redshifts. We find that LOFAR-detected radio sources with steep spectra have projected linear sizes that are on average 4.4$\pm$1.4 larger than those with flat spectra. The projected linear sizes of radio galaxies are on average 3.1$\pm$1.0 larger than those of quasars (2.0$\pm$0.3 after correcting for redshift evolution). Combining these results with three previous surveys, we find that the projected linear sizes of radio galaxies and quasars depend on redshift but not on power. The projected linear size ratio does not correlate with either parameter. The LOFAR data is consistent within the uncertainties with theoretical predictions of the correlation between the quasar fraction and linear size ratio, based on an orientation-based unification scheme.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectastro-ph.GA
dc.subjectastro-ph.CO
dc.titleInvestigating the Unification of LOFAR-detected powerful AGN in the Boötes Fielden
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stx959
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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