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dc.contributor.authorRamasawmy, J.
dc.contributor.authorGeach, J. E.
dc.contributor.authorHardcastle, M. J.
dc.contributor.authorBest, P. N.
dc.contributor.authorBonato, M.
dc.contributor.authorBondi, M.
dc.contributor.authorRivera, G. Calistro
dc.contributor.authorCochrane, R. K.
dc.contributor.authorConway, J. E.
dc.contributor.authorCoppin, K.
dc.contributor.authorDuncan, K. J.
dc.contributor.authorDunlop, J. S.
dc.contributor.authorFranco, M.
dc.contributor.authorGarcía-Vergara, C.
dc.contributor.authorJarvis, M. J.
dc.contributor.authorKondapally, R.
dc.contributor.authorMcCheyne, I.
dc.contributor.authorPrandoni, I.
dc.contributor.authorRöttgering, H. J. A.
dc.contributor.authorSmith, D. J. B.
dc.contributor.authorTasse, C.
dc.contributor.authorWang, L.
dc.date.accessioned2021-07-30T13:06:59Z
dc.date.available2021-07-30T13:06:59Z
dc.date.issued2021-04-19
dc.identifier.citationRamasawmy , J , Geach , J E , Hardcastle , M J , Best , P N , Bonato , M , Bondi , M , Rivera , G C , Cochrane , R K , Conway , J E , Coppin , K , Duncan , K J , Dunlop , J S , Franco , M , García-Vergara , C , Jarvis , M J , Kondapally , R , McCheyne , I , Prandoni , I , Röttgering , H J A , Smith , D J B , Tasse , C & Wang , L 2021 , ' Low-frequency radio spectra of submillimetre galaxies in the Lockman Hole ' , Astronomy & Astrophysics , vol. 648 , A14 . https://doi.org/10.1051/0004-6361/202039858
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 24855158
dc.identifier.otherPURE UUID: b17cd18c-2c74-44f7-b129-f60a9d68277c
dc.identifier.otherArXiv: http://arxiv.org/abs/2103.09677v1
dc.identifier.otherORCID: /0000-0001-9708-253X/work/97834483
dc.identifier.otherORCID: /0000-0002-0729-2988/work/97834506
dc.identifier.otherORCID: /0000-0002-3560-8599/work/97834582
dc.identifier.otherScopus: 85104664496
dc.identifier.urihttp://hdl.handle.net/2299/24932
dc.description© ESO 2021. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1051/0004-6361/202039858
dc.description.abstractWe investigate the radio properties of a sample of 53 sources selected at 850 $\mu$m from the SCUBA-2 Cosmology Legacy Survey using new deep, low-frequency radio imaging of the Lockman Hole field from the Low Frequency Array. Combining these data with additional radio observations from the GMRT and the JVLA, we find a variety of radio spectral shapes and luminosities within our sample despite their similarly bright submillimetre flux densities. We characterise their spectral shapes in terms of multi-band radio spectral indices. Finding strong spectral flattening at low frequencies in ~20% of sources, we investigate the differences between sources with extremely flat low-frequency spectra and those with `normal' radio spectral indices. As there are no other statistically significant differences between the two subgroups of our sample as split by the radio spectral index, we suggest that any differences are undetectable in galaxy-averaged properties that we can observe with our unresolved images, and likely relate to galaxy properties that we cannot resolve, on scales $\lesssim$ 1 kpc. We attribute the observed spectral flattening in the radio to free-free absorption, proposing that those sources with significant low-frequency spectral flattening have a clumpy distribution of star-forming gas. We estimate an average spatial extent of absorbing material of at most several hundred parsecs to produce the levels of absorption observed in the radio spectra. This estimate is consistent with the highest-resolution observations of submillimetre galaxies in the literature, which find examples of non-uniform dust distributions on scales of ~100 pc, with evidence for clumps and knots in the interstellar medium. Additionally, we find two bright (> 6 mJy) submm sources undetected at all other wavelengths. We speculate that these objects may be very high redshift sources, likely residing at z > 4.en
dc.format.extent14
dc.language.isoeng
dc.relation.ispartofAstronomy & Astrophysics
dc.subjectastro-ph.GA
dc.titleLow-frequency radio spectra of submillimetre galaxies in the Lockman Holeen
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionCentre of Data Innovation Research
dc.contributor.institutionCentre for Climate Change Research
dc.contributor.institutionDepartment of Physics, Astronomy and Mathematics
dc.contributor.institutionSPECS Deans Group
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1051/0004-6361/202039858
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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