Show simple item record

dc.contributor.authorGalvin, T J
dc.contributor.authorSeymour, N.
dc.contributor.authorMarvil, J.
dc.contributor.authorFilipovic, M D
dc.contributor.authorTothill, N.F.H.
dc.contributor.authorMcDermid, Richard M.
dc.contributor.authorHurley-Walker, N.
dc.contributor.authorHancock, P. J.
dc.contributor.authorCallingham, J. R.
dc.contributor.authorCook, R H
dc.contributor.authorNorris, Ray P.
dc.contributor.authorBell, M E
dc.contributor.authorDwarakanath, K. S.
dc.contributor.authorFor, B. -Q.
dc.contributor.authorGaensler, B. M.
dc.contributor.authorHindson, L
dc.contributor.authorJohnston-Hollitt, M.
dc.contributor.authorKapińska, 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.accessioned2018-09-12T15:20:29Z
dc.date.available2018-09-12T15:20:29Z
dc.date.issued2018-02-01
dc.identifier.citationGalvin , 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.issn0035-8711
dc.identifier.otherPURE: 12655550
dc.identifier.otherPURE UUID: 01d3a488-ea23-470b-ad0b-1a656b4602ab
dc.identifier.otherArXiv: http://arxiv.org/abs/1710.01967v1
dc.identifier.otherScopus: 85046091993
dc.identifier.urihttp://hdl.handle.net/2299/20580
dc.descriptionThis 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.abstractWe 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.extent21
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectGalaxies: starburst
dc.subjectRadio continuum: galaxies
dc.subjectAstronomy and Astrophysics
dc.subjectSpace and Planetary Science
dc.titleThe Spectral Energy Distribution of Powerful Starburst Galaxies I : Modelling the Radio Continuumen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85046091993&partnerID=8YFLogxK
rioxxterms.versionSMUR
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stx2613
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record