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dc.contributor.authorSmith, Daniel J. B.
dc.contributor.authorHayward, Christopher C.
dc.date.accessioned2018-05-24T16:54:12Z
dc.date.available2018-05-24T16:54:12Z
dc.date.issued2018-05-11
dc.identifier.citationSmith , D J B & Hayward , C C 2018 , ' Panchromatic SED modelling of spatially-resolved galaxies ' , Monthly Notices of the Royal Astronomical Society , vol. 476 , no. 2 , sty311 , pp. 1705–1725 . https://doi.org/10.1093/mnras/sty311
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 13401191
dc.identifier.otherPURE UUID: 101fbc61-70f2-4281-9546-923449e890ee
dc.identifier.otherArXiv: http://arxiv.org/abs/1802.02587v1
dc.identifier.otherScopus: 85043597410
dc.identifier.urihttp://hdl.handle.net/2299/20081
dc.descriptionThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.description.abstractWe test the efficacy of the energy-balance spectral energy distribution (SED) fitting code MAGPHYS for recovering the spatially resolved properties of a simulated isolated disc galaxy, for which it was not designed. We perform 226 950 MAGPHYS SED fits to regions between 0.2 and 25 kpc in size across the galaxy's disc, viewed from three different sight-lines, to probe how well MAGPHYS can recover key galaxy properties based on 21 bands of UV-far-infrared model photometry. MAGPHYS yields statistically acceptable fits to >99 per cent of the pixels within the r-band effective radius and between 59 and 77 percent of pixels within 20 kpc of the nucleus. MAGPHYS is able to recover the distribution of stellar mass, star formation rate (SFR), specific SFR, dust luminosity, dust mass, and V-band attenuation reasonably well, especially when the pixel size is ≳1 kpc, whereas non-standard outputs (stellar metallicity and mass-weighted age) are recovered less well. Accurate recovery is more challenging in the smallest sub-regions of the disc (pixel scale ≲1 kpc), where the energy balance criterion becomes increasingly incorrect. Estimating integrated galaxy properties by summing the recovered pixel values, the true integrated values of all parameters considered except metallicity and age are well recovered at all spatial resolutions, ranging from 0.2 kpc to integrating across the disc, albeit with some evidence for resolution-dependent biases. These results must be considered when attempting to analyse the structure of real galaxies with actual observational data, for which the 'ground truth' is unknown.en
dc.format.extent21
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.subjectDust, extinction
dc.subjectGalaxies: fundamental parameters
dc.subjectGalaxies: ISM
dc.subjectGalaxies: stellar content
dc.subjectInfrared: galaxies
dc.subjectRadiative transfer
dc.subjectAstronomy and Astrophysics
dc.subjectSpace and Planetary Science
dc.titlePanchromatic SED modelling of spatially-resolved galaxiesen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85043597410&partnerID=8YFLogxK
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2018-05-11
rioxxterms.versionAM
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/sty311
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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