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dc.contributor.authorSmith, D. J. B.
dc.contributor.authorHardcastle, Martin J.
dc.contributor.authorJarvis, Matt J.
dc.contributor.authorMaddox, Steve J.
dc.contributor.authorDunne, Loretta
dc.contributor.authorBonfield, D. G.
dc.contributor.authorEales, Steve A.
dc.contributor.authorSerjeant, Stephen
dc.contributor.authorThompson, M. A.
dc.contributor.authorBaes, Maarten
dc.contributor.authorClements, David L. Z.
dc.contributor.authorCooray, Asantha Roshan
dc.contributor.authorDe Zotti, Gianfranco
dc.contributor.authorGonzález-Nuevo, Joaquín
dc.contributor.authorWerf, Paul P. van der
dc.contributor.authorVirdee, J.
dc.contributor.authorBourne, N.
dc.contributor.authorDariush, Ali A.
dc.contributor.authorHopwood, Ros H. B.
dc.contributor.authorIbar, Edo
dc.contributor.authorValiante, Elisabetta
dc.contributor.otherUniversidad de Cantabriaes_ES
dc.date.accessioned2014-06-26T13:34:05Z
dc.date.available2014-06-26T13:34:05Z
dc.date.issued2013-12
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.urihttp://hdl.handle.net/10902/4848
dc.description.abstractWe use galaxies from the Herschel-ATLAS (H-ATLAS) survey, and a suite of ancillary simulations based on an isothermal dust model, to study our ability to determine the effective dust temperature, luminosity and emissivity index of 250 μm selected galaxies in the local Universe (z < 0.5). As well as simple far-infrared spectral energy distribution (SED) fitting of individual galaxies based on χ2 minimization, we attempt to derive the best global isothermal properties of 13 826 galaxies with reliable optical counterparts and spectroscopic redshifts. Using our simulations, we highlight the fact that applying traditional SED fitting techniques to noisy observational data in the Herschel Space Observatory bands introduces artificial anti-correlation between derived values of dust temperature and emissivity index. This is true even for galaxies with the most robust statistical detections in our sample, making the results of such fitting difficult to interpret. We apply a method to determine the best-fitting global values of isothermal effective temperature and emissivity index for z < 0.5 galaxies in H-ATLAS, deriving Teff = 22.3 ± 0.1 K and β = 1.98 ± 0.02 (or Teff = 23.5 ± 0.1 K and β = 1.82 ± 0.02 if we attempt to correct for bias by assuming that Teff and βeff are independent and normally distributed). We use our technique to test for an evolving emissivity index, finding only weak evidence. The median dust luminosity of our sample is log10(Ldust/L⊙) = 10.72 ± 0.05, which (unlike Teff) shows little dependence on the choice of β used in our analysis, including whether it is variable or fixed. In addition, we use a further suite of simulations based on a fixed emissivity index isothermal model to emphasize the importance of the H-ATLAS PACS data for deriving dust temperatures at these redshifts, even though they are considerably less sensitive than the SPIRE data. Finally, we show that the majority of galaxies detected by H-ATLAS are normal star-forming galaxies, though with a substantial minority (∼31 per cent) falling in the Luminous Infrared Galaxy category.es_ES
dc.format.extent19 p.es_ES
dc.language.isoenges_ES
dc.publisherOxford University Presses_ES
dc.publisherRoyal Astronomical Societyes_ES
dc.rights© 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Societyes_ES
dc.sourceMonthly Notices of the Royal Astronomical Society, vol. 436, iss.3, Pp.2435-2453 (2013)es_ES
dc.subject.otherGalaxies: starburstes_ES
dc.subject.otherSubmillimetre: galaxieses_ES
dc.titleIsothermal dust models of Herschel-ATLAS* galaxieses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.relation.publisherVersionhttp://dx.doi.org/10.1093/mnras/stt1737es_ES
dc.rights.accessRightsopenAccesses_ES
dc.identifier.DOI10.1093/mnras/stt1737
dc.type.versionpublishedVersiones_ES


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