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dc.contributor.authorCallingham, J. R.
dc.contributor.authorEkers, R. D.
dc.contributor.authorGaensler, B. M.
dc.contributor.authorLine, J. L. B.
dc.contributor.authorHurley-Walker, N.
dc.contributor.authorSadler, E. M.
dc.contributor.authorTingay, S. J.
dc.contributor.authorHancock, P. J.
dc.contributor.authorBell, M. E.
dc.contributor.authorDwarakanath, K. S.
dc.contributor.authorFor, B. -Q.
dc.contributor.authorFranzen, T. M. O.
dc.contributor.authorHindson, Luke
dc.contributor.authorJohnston-Hollitt, M.
dc.contributor.authorKapinska, A. D.
dc.contributor.authorLenc, E.
dc.contributor.authorMcKinley, B.
dc.contributor.authorMorgan, J.
dc.contributor.authorOffringa, A. R.
dc.contributor.authorProcopio, P.
dc.contributor.authorStaveley-Smith, L.
dc.contributor.authorWayth, R. B.
dc.contributor.authorWu, C.
dc.contributor.authorZheng, Q.
dc.date.accessioned2017-06-05T16:56:37Z
dc.date.available2017-06-05T16:56:37Z
dc.date.issued2017-02-20
dc.identifier.citationCallingham , J R , Ekers , R D , Gaensler , B M , Line , J L B , Hurley-Walker , N , Sadler , E M , Tingay , S J , Hancock , P J , Bell , M E , Dwarakanath , K S , For , B -Q , Franzen , T M O , Hindson , L , Johnston-Hollitt , M , Kapinska , A D , Lenc , E , McKinley , B , Morgan , J , Offringa , A R , Procopio , P , Staveley-Smith , L , Wayth , R B , Wu , C & Zheng , Q 2017 , ' Extragalactic Peaked-Spectrum Radio Sources at Low Frequencies ' , The Astrophysical Journal , vol. 836 , no. 2 . https://doi.org/10.3847/1538-4357/836/2/174
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 11154572
dc.identifier.otherPURE UUID: a2f2e92d-3c45-4d4e-8a16-1b78b614052b
dc.identifier.otherArXiv: http://arxiv.org/abs/1701.02771v1
dc.identifier.otherScopus: 85014537399
dc.identifier.urihttp://hdl.handle.net/2299/18285
dc.descriptionThis document is the Accepted Manuscript of the following article: J.R. Callingham, et al, 'Extragalactic Peaked-Spectrum Radio Sources at Low Frequencies', The Astrophysical Journal, 836 (2), (28pp), first published online 17 February 2017. DOI: https://doi.org/10.3847/1538-4357-836/2/174. © 2017, The American Astronomical Society. All rights reserved. Data tables, and the appendix containing all of the SEDs, are available from the journal and on request to the author
dc.description.abstractWe present a sample of 1,483 sources that display spectral peaks between 72 MHz and 1.4 GHz, selected from the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey. The GLEAM survey is the widest fractional bandwidth all-sky survey to date, ideal for identifying peaked-spectrum sources at low radio frequencies. Our peaked-spectrum sources are the low frequency analogues of gigahertz-peaked spectrum (GPS) and compact-steep spectrum (CSS) sources, which have been hypothesized to be the precursors to massive radio galaxies. Our sample more than doubles the number of known peaked-spectrum candidates, and 95% of our sample have a newly characterized spectral peak. We highlight that some GPS sources peaking above 5 GHz have had multiple epochs of nuclear activity, and demonstrate the possibility of identifying high redshift ($z > 2$) galaxies via steep optically thin spectral indices and low observed peak frequencies. The distribution of the optically thick spectral indices of our sample is consistent with past GPS/CSS samples but with a large dispersion, suggesting that the spectral peak is a product of an inhomogeneous environment that is individualistic. We find no dependence of observed peak frequency with redshift, consistent with the peaked-spectrum sample comprising both local CSS sources and high-redshift GPS sources. The 5 GHz luminosity distribution lacks the brightest GPS and CSS sources of previous samples, implying that a convolution of source evolution and redshift influences the type of peaked-spectrum sources identified below 1 GHz. Finally, we discuss sources with optically thick spectral indices that exceed the synchrotron self-absorption limit.en
dc.format.extent28
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.rightsOpen
dc.subjectgalaxies: active
dc.subjectradiation mechanisms: general
dc.subjectradio continuum: general
dc.titleExtragalactic Peaked-Spectrum Radio Sources at Low Frequenciesen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.identifier.urlhttps://arxiv.org/abs/1701.02771
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2017-02-20
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.3847/1538-4357/836/2/174
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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