dc.contributor.author | Hogan, M.~T. | |
dc.contributor.author | Edge, A.~C. | |
dc.contributor.author | Geach, J.~E. | |
dc.contributor.author | Grainge, K.~J.~B. | |
dc.contributor.author | Hlavacek-Larrondo, J. | |
dc.contributor.author | Hovatta, T. | |
dc.contributor.author | Karim, A. | |
dc.contributor.author | McNamara, B.~R. | |
dc.contributor.author | Rumsey, C. | |
dc.contributor.author | Russell, H.~R. | |
dc.contributor.author | Salomé, P. | |
dc.contributor.author | Aller, H.~D. | |
dc.contributor.author | Aller, M.~F. | |
dc.contributor.author | Benford, D.~J. | |
dc.contributor.author | Fabian, A.~C. | |
dc.contributor.author | Readhead, A.~C.~S. | |
dc.contributor.author | Sadler, E.~M. | |
dc.contributor.author | Saunders, R.~D.~E. | |
dc.date.accessioned | 2017-07-10T14:56:13Z | |
dc.date.available | 2017-07-10T14:56:13Z | |
dc.date.issued | 2015-10-21 | |
dc.identifier.citation | Hogan , M T , Edge , A C , Geach , J E , Grainge , K J B , Hlavacek-Larrondo , J , Hovatta , T , Karim , A , McNamara , B R , Rumsey , C , Russell , H R , Salomé , P , Aller , H D , Aller , M F , Benford , D J , Fabian , A C , Readhead , A C S , Sadler , E M & Saunders , R D E 2015 , ' High radio-frequency properties and variability of brightest cluster galaxies ' , Monthly Notices of the Royal Astronomical Society , vol. 453 , no. 2 , pp. 1223-1240 . https://doi.org/10.1093/mnras/stv1518 | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.other | Bibtex: urn:e086069580bf4e266023f84ff68316bc | |
dc.identifier.uri | http://hdl.handle.net/2299/18854 | |
dc.description | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. | |
dc.description.abstract | We consider the high radio-frequency (15–353 GHz) properties and variability of 35 brightest cluster galaxies (BCGs). These are the most core-dominated sources drawn from a parent sample of more than 700 X-ray selected clusters, thus allowing us to relate our results to the general population. We find that ≥6.0 per cent of our parent sample (≥15.1 per cent if only cool-core clusters are considered) contain a radio source at 150 GHz of at least 3 mJy (≈1×1023 W Hz−1 at our median redshift of z ≈ 0.13). Furthermore, ≥3.4 per cent of the BCGs in our parent sample contain a peaked component (Gigahertz Peaked Spectrum, GPS) in their spectra that peaks above 2 GHz, increasing to ≥8.5 per cent if only cool-core clusters are considered. We see little evidence for strong variability at 15 GHz on short (week–month) time-scales although we see variations greater than 20 per cent at 150 GHz over six-month time frames for 4 of the 23 sources with multi-epoch observations. Much more prevalent is long-term (year–decade time-scale) variability, with average annual amplitude variations greater than 1 per cent at 15 GHz being commonplace. There is a weak trend towards higher variability as the peak of the GPS-like component occurs at higher frequency. We demonstrate the complexity that is seen in the radio spectra of BCGs and discuss the potentially significant implications of these high-peaking components for Sunyaev–Zel‘dovich cluster searches. | en |
dc.format.extent | 18 | |
dc.format.extent | 2655727 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.subject | galaxies: active, galaxies: clusters: general, galaxies: jets, radio continuum: galaxies | |
dc.title | High radio-frequency properties and variability of brightest cluster galaxies | en |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1093/mnras/stv1518 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |