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dc.contributor.authorAmorin Barbieri, Ricardoen
dc.contributor.authorFontana, Aen
dc.contributor.authorPérez-Montero, Een
dc.contributor.authorCastellano, Men
dc.contributor.authorGuaita, Len
dc.contributor.authorGrazian, Aen
dc.contributor.authorFèvre, OLen
dc.contributor.authorRibeiro, Ben
dc.contributor.authorSchaerer, Den
dc.contributor.authorTasca, LAMen
dc.contributor.authorThomas, Ren
dc.contributor.authorBardelli, Sen
dc.contributor.authorCassarà, Len
dc.contributor.authorCassata, Pen
dc.contributor.authorCimatti, Aen
dc.contributor.authorContini, Ten
dc.contributor.authorBarros, SDen
dc.contributor.authorGarilli, Ben
dc.contributor.authorGiavalisco, Men
dc.contributor.authorHathi, Nen
dc.contributor.authorKoekemoer, Aen
dc.contributor.authorLe Brun, Ven
dc.contributor.authorLemaux, BCen
dc.contributor.authorMaccagni, Den
dc.contributor.authorPentericci, Len
dc.contributor.authorPforr, Jen
dc.contributor.authorTalia, Men
dc.contributor.authorTresse, Len
dc.contributor.authorVanzella, Een
dc.contributor.authorVergani, Den
dc.contributor.authorZamorani, Gen
dc.contributor.authorZucca, Een
dc.contributor.authorMerlin, Een
dc.date.accessioned2017-03-29T14:55:24Z
dc.date.available2017-03-29T14:55:24Z
dc.identifier.issn2397-3366
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/263329
dc.description.abstractDeep observations are revealing a growing number of young galaxies in the first billion years of cosmic time. Compared to typical galaxies at later times, they show more extreme emission-line properties, higher star formation rates, lower masses, and smaller sizes. However, their faintness precludes studies of their chemical abundances and ionization conditions, strongly limiting our understanding of the physics driving early galaxy build-up and metal enrichment. Here we study a rare population of ultraviolet-selected, low-luminosity galaxies at redshift 2.4 < z < 3.5 that exhibit all the rest-frame properties expected from primeval galaxies. These low-mass, highly compact systems are rapidly forming galaxies able to double their stellar mass in only a few tens of millions of years. They are characterized by very blue ultraviolet spectra with weak absorption features and bright nebular emission lines, which imply hard radiation fields from young hot massive stars. Their highly ionized gas phase has strongly sub-solar carbon and oxygen abundances, with metallicities more than a factor of two lower than that found in typical galaxies of similar mass and star formation rate at z≤2.5. These young galaxies reveal an early and short stage in the assembly of their galactic structures and their chemical evolution, a vigorous phase that is likely to be dominated by the effects of gas-rich mergers, accretion of metal-poor gas and strong outflows.
dc.description.sponsorshipThis work is supported by funding from the European Research Council Advanced Grant ERC-2010-AdG-268107-EARLY and by INAF Grants PRIN 2010, PRIN 2012 and PICS 2013.This work is based on data products made available at the CESAM data center, Laboratoire d’Astrophysique de Marseille, France. This research leading to these results has received funding from the European Union Seventh Framework Programme ASTRODEEP (FP7 2007/2013) under grant agreement no. 312725. R.A. acknowledges support from the ERC Advanced Grant 695671 ‘QUENCH’. E.P.M. acknowledges support from Spanish MICINN grants AYA2010-21887-C04-01 and AYA2013-47742-C4-1-P.
dc.language.isoenen
dc.publisherNature Publishing Group
dc.subjectcosmologyen
dc.subjectgalaxies and clustersen
dc.titleAnalogues of primeval galaxies two billion years after the Big Bangen
dc.typeArticle
prism.number0052en
prism.publicationNameNature Astronomyen
prism.volume1en
dc.identifier.doi10.17863/CAM.8665
dcterms.dateAccepted2017-01-13en
rioxxterms.versionofrecord10.1038/s41550-017-0052en
rioxxterms.versionAMen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2017-01-13en
dc.contributor.orcidAmorin Barbieri, Ricardo [0000-0001-5758-1000]
dc.identifier.eissn2397-3366
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idECH2020 EUROPEAN RESEARCH COUNCIL (ERC) (695671)
cam.issuedOnline2017-03-02en
rioxxterms.freetoread.startdate2017-09-02


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