dc.contributor.author | Callingham, J. R. | |
dc.contributor.author | Ekers, R. D. | |
dc.contributor.author | Gaensler, B. M. | |
dc.contributor.author | Line, J. L. B. | |
dc.contributor.author | Hurley-Walker, N. | |
dc.contributor.author | Sadler, E. M. | |
dc.contributor.author | Tingay, S. J. | |
dc.contributor.author | Hancock, P. J. | |
dc.contributor.author | Bell, M. E. | |
dc.contributor.author | Dwarakanath, K. S. | |
dc.contributor.author | For, B. -Q. | |
dc.contributor.author | Franzen, T. M. O. | |
dc.contributor.author | Hindson, Luke | |
dc.contributor.author | Johnston-Hollitt, M. | |
dc.contributor.author | Kapinska, A. D. | |
dc.contributor.author | Lenc, E. | |
dc.contributor.author | McKinley, B. | |
dc.contributor.author | Morgan, J. | |
dc.contributor.author | Offringa, A. R. | |
dc.contributor.author | Procopio, P. | |
dc.contributor.author | Staveley-Smith, L. | |
dc.contributor.author | Wayth, R. B. | |
dc.contributor.author | Wu, C. | |
dc.contributor.author | Zheng, Q. | |
dc.date.accessioned | 2017-06-05T16:56:37Z | |
dc.date.available | 2017-06-05T16:56:37Z | |
dc.date.issued | 2017-02-20 | |
dc.identifier.citation | Callingham , 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.issn | 0004-637X | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/1701.02771v1 | |
dc.identifier.uri | http://hdl.handle.net/2299/18285 | |
dc.description | This 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.abstract | We 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.extent | 28 | |
dc.format.extent | 3120696 | |
dc.language.iso | eng | |
dc.relation.ispartof | The Astrophysical Journal | |
dc.subject | galaxies: active | |
dc.subject | radiation mechanisms: general | |
dc.subject | radio continuum: general | |
dc.title | Extragalactic Peaked-Spectrum Radio Sources at Low Frequencies | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
dc.identifier.url | https://arxiv.org/abs/1701.02771 | |
rioxxterms.versionofrecord | 10.3847/1538-4357/836/2/174 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |