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dc.contributor.authorFudamoto, Yen
dc.contributor.authorOesch, PAen
dc.contributor.authorFaisst, Aen
dc.contributor.authorBéthermin, Men
dc.contributor.authorGinolfi, Men
dc.contributor.authorKhusanova, Yen
dc.contributor.authorLoiacono, Fen
dc.contributor.authorLe Fèvre, Oen
dc.contributor.authorCapak, Pen
dc.contributor.authorSchaerer, Den
dc.contributor.authorSilverman, JDen
dc.contributor.authorCassata, Pen
dc.contributor.authorYan, Len
dc.contributor.authorAmorin, Ren
dc.contributor.authorBardelli, Sen
dc.contributor.authorBoquien, Men
dc.contributor.authorCimatti, Aen
dc.contributor.authorDessauges-Zavadsky, Men
dc.contributor.authorFujimoto, Sen
dc.contributor.authorGruppioni, Cen
dc.contributor.authorHathi, NPen
dc.contributor.authorIbar, Een
dc.contributor.authorJones, Garethen
dc.contributor.authorKoekemoer, AMen
dc.contributor.authorLagache, Gen
dc.contributor.authorLemaux, BCen
dc.contributor.authorMaiolino, Robertoen
dc.contributor.authorNarayanan, Den
dc.contributor.authorPozzi, Fen
dc.contributor.authorRiechers, DAen
dc.contributor.authorRodighiero, Gen
dc.contributor.authorTalia, Men
dc.contributor.authorToft, Sen
dc.contributor.authorVallini, Len
dc.contributor.authorVergani, Den
dc.contributor.authorZamorani, Gen
dc.contributor.authorZucca, Een
dc.date.accessioned2020-09-24T23:30:43Z
dc.date.available2020-09-24T23:30:43Z
dc.date.issued2020-11-01en
dc.identifier.issn0004-6361
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/310705
dc.description.abstractWe present dust attenuation properties of spectroscopically confirmed star forming galaxies on the main sequence at redshift ~4.4-5.8. Our analyses are based on the far infrared continuum observations of 118 galaxies at rest-frame $158\,\rm{\mu m}$ obtained with the ALMA large program ALPINE. We study the connection between the UV spectral slope ($\beta$), stellar mass ($M_{\star}$), and infrared excess (IRX$=L_{\rm{IR}}/L_{\rm{UV}}$). Twenty-three galaxies are individually detected in the continuum at $>3.5\,\sigma$ significance. We perform a stacking analysis using both detections and non-detections to study the average dust attenuation properties at z~4.4-5.8. The individual detections and stacks show that the IRX-$\beta$ relation at z~5 is consistent with a steeper dust attenuation curve than typically found at lower redshifts (z<4). The attenuation curve is similar to or even steeper than that of the extinction curve of the Small Magellanic Cloud (SMC). This systematic change of the IRX-$\beta$ relation as a function of redshift suggests an evolution of dust attenuation properties at $z>4$. Similarly, we find that our galaxies have lower IRX values up to 1 dex on average at fixed mass compared to previously studied IRX-$M_{\star}$ relations at $z\lesssim4$, albeit with significant scatter. This implies a lower obscured fraction of star-formation than at lower redshifts. Our results suggest that dust properties of UV-selected star forming galaxies at $z\gtrsim4$ are characterised by (i) a steeper attenuation curve than at $z\lesssim4$, and (ii) a rapidly decreasing dust obscured fraction of star formation as a function of redshift. Nevertheless, even among this UV-selected sample, massive galaxies ($\log M_{\star}/M_\odot > 10$) at z~5-6 already exhibit an obscured fraction of star formation of $\sim45\%$, indicating a rapid build-up of dust during the epoch of reionization.
dc.description.sponsorshipSTFC ERC
dc.publisherEDP Sciences
dc.rightsAll rights reserved
dc.titleThe ALPINE-ALMA [CII] survey: Dust attenuation properties and obscured star formation at z ∼4.4-5.8en
dc.typeArticle
prism.publicationDate2020en
prism.publicationNameAstronomy and Astrophysicsen
prism.volume643en
dc.identifier.doi10.17863/CAM.57795
dcterms.dateAccepted2020-09-23en
rioxxterms.versionofrecord10.1051/0004-6361/202038163en
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2020-11-01en
dc.contributor.orcidJones, Gareth [0000-0002-0267-9024]
dc.contributor.orcidMaiolino, Roberto [0000-0002-4985-3819]
dc.identifier.eissn1432-0746
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idSTFC (ST/M001172/1)
pubs.funder-project-idECH2020 EUROPEAN RESEARCH COUNCIL (ERC) (695671)
cam.orpheus.counter10*
rioxxterms.freetoread.startdate2023-09-24


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