The Spectral Energy Distribution of Powerful Starburst Galaxies I : Modelling the Radio Continuum
dc.contributor.author | Galvin, T J | |
dc.contributor.author | Seymour, N. | |
dc.contributor.author | Marvil, J. | |
dc.contributor.author | Filipovic, M D | |
dc.contributor.author | Tothill, N.F.H. | |
dc.contributor.author | McDermid, Richard M. | |
dc.contributor.author | Hurley-Walker, N. | |
dc.contributor.author | Hancock, P. J. | |
dc.contributor.author | Callingham, J. R. | |
dc.contributor.author | Cook, R H | |
dc.contributor.author | Norris, Ray P. | |
dc.contributor.author | Bell, M E | |
dc.contributor.author | Dwarakanath, K. S. | |
dc.contributor.author | For, B. -Q. | |
dc.contributor.author | Gaensler, B. M. | |
dc.contributor.author | Hindson, L | |
dc.contributor.author | Johnston-Hollitt, M. | |
dc.contributor.author | Kapińska, 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 | 2018-09-12T15:20:29Z | |
dc.date.available | 2018-09-12T15:20:29Z | |
dc.date.issued | 2018-02-01 | |
dc.identifier.citation | Galvin , T J , Seymour , N , Marvil , J , Filipovic , M D , Tothill , N F H , McDermid , R M , Hurley-Walker , N , Hancock , P J , Callingham , J R , Cook , R H , Norris , R P , Bell , M E , Dwarakanath , K S , For , B -Q , Gaensler , B M , Hindson , L , Johnston-Hollitt , M , Kapińska , A D , Lenc , E , McKinley , B , Morgan , J , Offringa , A R , Procopio , P , Staveley-Smith , L , Wayth , R B , Wu , C & Zheng , Q 2018 , ' The Spectral Energy Distribution of Powerful Starburst Galaxies I : Modelling the Radio Continuum ' , Monthly Notices of the Royal Astronomical Society , vol. 474 , no. 1 , pp. 779–799 . https://doi.org/10.1093/mnras/stx2613 | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/1710.01967v1 | |
dc.identifier.uri | http://hdl.handle.net/2299/20580 | |
dc.description | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | |
dc.description.abstract | We have acquired radio-continuum data between 70MHz and 48 GHz for a sample of 19 southern starburst galaxies at moderate redshifts (0.067 < z < 0.227) with the aim of separating synchrotron and free-free emission components. Using a Bayesian framework, we find the radio continuum is rarely characterized well by a single power law, instead often exhibiting lowfrequency turnovers below 500 MHz, steepening at mid to high frequencies, and a flattening at high frequencies where free-free emission begins to dominate over the synchrotron emission. These higher order curvature components may be attributed to free-free absorption across multiple regions of star formation with varying optical depths. The decomposed synchrotron and free-free emission components in our sample of galaxies form strong correlations with the total-infrared bolometric luminosities. Finally, we find that without accounting for free-free absorption with turnovers between 90 and 500MHz the radio continuum at low frequency (v < 200 MHz) could be overestimated by upwards of a factor of 12 if a simple power-law extrapolation is used from higher frequencies. The mean synchrotron spectral index of our sample is constrained to be α = -1.06, which is steeper than the canonical value of -0.8 for normal galaxies. We suggest this may be caused by an intrinsically steeper cosmic ray distribution. | en |
dc.format.extent | 21 | |
dc.format.extent | 2180127 | |
dc.format.extent | 2212749 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.subject | Galaxies: starburst | |
dc.subject | Radio continuum: galaxies | |
dc.subject | Astronomy and Astrophysics | |
dc.subject | Space and Planetary Science | |
dc.title | The Spectral Energy Distribution of Powerful Starburst Galaxies I : Modelling the Radio Continuum | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
dc.identifier.url | http://www.scopus.com/inward/record.url?scp=85046091993&partnerID=8YFLogxK | |
rioxxterms.versionofrecord | 10.1093/mnras/stx2613 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true |