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dc.contributor.authorPentericci, L.
dc.contributor.authorCarniani, S.
dc.contributor.authorCastellano, M.
dc.contributor.authorFontana, A.
dc.contributor.authorMaiolino, R.
dc.contributor.authorGuaita, L.
dc.contributor.authorVanzella, E.
dc.contributor.authorGrazian, A.
dc.contributor.authorSantini, P.
dc.contributor.authorYan, H.
dc.contributor.authorCristiani, S.
dc.contributor.authorConselice, C.
dc.contributor.authorGiavalisco, M.
dc.contributor.authorHathi, N.
dc.contributor.authorKoekemoer, A.
dc.date.accessioned2016-10-25T12:28:31Z
dc.date.available2016-10-25T12:28:31Z
dc.date.issued2016-09-19
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/260893
dc.descriptionThis is the final version of the article. It first appeared from IOP Science via http://dx.doi.org/10.3847/2041-8205/829/1/L11en
dc.description.abstractWe present new results on [C $\Tiny \text{II}$]158 $\mu$m emission from four galaxies in the reionization epoch. These galaxies were previously confirmed to be at redshifts between 6.6 and 7.15 from the presence of the Ly$\alpha$ emission line in their spectra. The Ly$\alpha$ emission line is redshifted by 100–200 km s$^{-1}$ compared to the systemic redshift given by the [C $\Tiny \text{II}$] line. These velocity offsets are smaller than what is observed in $z$ ~ 3 Lyman break galaxies (LBGs) with similar UV luminosities and emission line properties. Smaller velocity shifts reduce the visibility of Ly$\alpha$ and hence somewhat alleviate the need for a very neutral intergalactic medium at $z$ ~ 7 to explain the drop in the fraction of Ly$\alpha$ emitters observed at this epoch. The galaxies show [C $\Tiny \text{II}$] emission with $\small{L}$[C $\Tiny \text{II}$] = 0.6 - 1.6 $\times$ 10$^8\small{L}_{\odot}$: these luminosities place them consistently below the star formation rate (SFR)–$\small{L}$[C $\Tiny \text{II}$] relation observed for low-redshift star-forming and metal-poor galaxies and also below $z$ = 5.5 LBGs with similar SFRs. We argue that previous undetections of [C $\Tiny \text{II}$] in $z$ ~ 7 galaxies with similar or smaller SFRs are due to selection effects: previous targets were mostly strong Ly$\alpha$ emitters and therefore probably metal-poor systems, while our galaxies are more representative of the general high-redshift star-forming population.en
dc.description.sponsorshipScience and Technology Facilities Councilen
dc.language.isoenen
dc.publisherIOP Scienceen
dc.subjectgalaxies: evolutionen
dc.subjectgalaxies: formationen
dc.subjectgalaxies: high-redshiften
dc.titleTRACING THE REIONIZATION EPOCH WITH ALMA: [C $\Tiny \text{II}$] EMISSION IN z ~ 7 GALAXIESen
dc.typeArticleen
prism.issueIdentifier1en
prism.numberL11en
prism.publicationNameThe Astrophysical Journal Lettersen
prism.volume829en
dc.identifier.doi10.17863/CAM.6070
dcterms.dateAccepted2016-09-01
rioxxterms.versionofrecord10.3847/2041-8205/829/1/L11en
rioxxterms.versionVoRen
cam.orpheus.successThu Jan 30 12:57:24 GMT 2020 - The item has an open VoR version.*
rioxxterms.freetoread.startdate2100-01-01


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