The complex physics of dusty star-forming galaxies at high redshifts as revealed by Herschel and Spitzer

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dc.contributor.authorLo Faro, Barbara
dc.contributor.authorFranceschini, Alberto
dc.contributor.authorVaccari, M.
dc.contributor.authorSilva, L.
dc.contributor.authorRodighiero, G.
dc.contributor.authorBerta, S.
dc.contributor.authorBock, J.
dc.contributor.authorBurgarella, D.
dc.contributor.authorBuat, V.
dc.contributor.authorCava, A.
dc.contributor.authorClements, D.L.
dc.contributor.authorCooray, Asantha
dc.contributor.authorFarrah, D.
dc.contributor.authorFeltre, Anna
dc.contributor.authorGonzalez-Solares, Eduardo A.
dc.contributor.authorHurley, P.
dc.contributor.authorLutz, D.
dc.contributor.authorMagdis, G.
dc.contributor.authorMagnelli, B.
dc.contributor.authorMarchetti, L.
dc.contributor.authorOliver, S.J.
dc.contributor.authorPage, Matthew J.
dc.contributor.authorPopesso, P.
dc.contributor.authorPozzi, F.
dc.contributor.authorRigopoulou, D.
dc.contributor.authorRowan-Robinson, M.
dc.contributor.authorRoseboom, I.G.
dc.contributor.authorScott, Douglas
dc.contributor.authorSmith, A.J.
dc.contributor.authorSymeonidis, Myrto
dc.contributor.authorWang, L.
dc.contributor.authorWuyts, S.
dc.date.accessioned2017-07-24T09:20:26Z
dc.date.available2017-07-24T09:20:26Z
dc.date.issued2013
dc.description.abstractWe combine far-infrared photometry from Herschel (PEP/HerMES) with deep mid-infrared spectroscopy from Spitzer to investigate the nature and the mass assembly history of a sample of 31 luminous and ultraluminous infrared galaxies ((U)LIRGs) at z ∼ 1 and 2 selected in GOODS-S with 24μm fluxes between 0.2 and 0.5 mJy.We model the data with a self-consistent physical model (GRASIL) which includes a state-of-the-art treatment of dust extinction and reprocessing. We find that all of our galaxies appear to require massive populations of old (>1 Gyr) stars and, at the same time, to host a moderate ongoing activity of star formation (SFR 100M yr−1). The bulk of the stars appear to have been formed a few Gyr before the observation in essentially all cases. Only five galaxies of the sample require a recent starburst superimposed on a quiescent star formation history.We also find discrepancies between our results and those based on optical-only spectral energy distribution (SED) fitting for the same objects; by fitting their observed SEDs with our physical model we find higher extinctions (by ΔAV ∼ 0.81 and 1.14) and higher stellar masses (by Δlog(M ) ∼ 0.16 and 0.36 dex) for z ∼ 1 and z ∼ 2 (U)LIRGs, respectively. The stellar mass difference is larger for the most dust-obscured objects. We also find lower SFRs than those computed from LIR using the Kennicutt relation due to the significant contribution to the dust heating by intermediate-age stellar populations through “cirrus” emission (∼73% and ∼66% of the total LIR for z ∼ 1 and z ∼ 2 (U)LIRGs, respectively).en_US
dc.description.accreditationDepartment of HE and Training approved list
dc.identifier.citationLo Faro, B. et al. (2013). The complex physics of dusty star-forming galaxies at high redshifts as revealed by Herschel and Spitzer. The Astrophysical Journal , 762 (108): 1-13en_US
dc.identifier.issn0004-637x
dc.identifier.urihttp://hdl.handle.net/10566/3099
dc.language.isoenen_US
dc.publisherIOP Publishingen_US
dc.rightsPublisher retains copyright. Authors may archive the published version in their institutional repository.
dc.source.urihttp://dx.doi.org/10.1088/0004-637X/762/2/108
dc.subjectGalaxiesen_US
dc.subjectEvolution – galaxiesen_US
dc.subjectGeneral – galaxiesen_US
dc.subjectInteractions – galaxiesen_US
dc.subjectStarbursten_US
dc.titleThe complex physics of dusty star-forming galaxies at high redshifts as revealed by Herschel and Spitzeren_US
dc.typeArticleen_US

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