dc.contributor.author D'Odorico, V en dc.contributor.author Cristiani, S en dc.contributor.author Pomante, E en dc.contributor.author Carswell, RF en dc.contributor.author Viel, M en dc.contributor.author Barai, P en dc.contributor.author Becker, GD en dc.contributor.author Calura, F en dc.contributor.author Cupani, G en dc.contributor.author Fontanot, F en dc.contributor.author Haehnelt, Martin en dc.contributor.author Kim, T-S en dc.contributor.author Miralda-Escude, J en dc.contributor.author Rorai, Alberto en dc.contributor.author Tescari, E en dc.contributor.author Vanzella, E en dc.date.accessioned 2016-10-19T10:50:18Z dc.date.available 2016-10-19T10:50:18Z dc.date.issued 2016-09-28 en dc.identifier.issn 0035-8711 dc.identifier.uri https://www.repository.cam.ac.uk/handle/1810/260816 dc.description.abstract In this work, we investigate the abundance and distribution of metals in the intergalactic medium (IGM) at 〈z〉 ≃ 2.8 through the analysis of an ultra-high signal-to-noise ratio UVES spectrum of the quasar HE0940-1050. In the C iv forest, our deep spectrum is sensitive at 3σ to lines with column density down to log N$_{CIV}$$\simeq 11.4 and in 60 per cent of the considered redshift range down to \simeq 11.1. In our sample, all H I lines with log N_{HI} ≥ 14.8 show an associated C IV absorption. In the range 14.0 ≤ log N_{HI} < 14.8, 43 per cent of H I lines has an associated C IV absorption. At log N_{HI} < 14.0, the detection rates drop to <10 per cent, possibly due to our sensitivity limits and not to an actual variation of the gas abundance properties. In the range log_{HI}N ≥ 14, we observe a fraction of H I lines with detected C IV a factor of 2 larger than the fraction of H I lines lying in the circumgalactic medium (CGM) of relatively bright Lyman-break galaxies hosted by dark matter haloes with 〈M〉\sim 10^{12} M\odot. The comparison of our results with the output of a grid of photoionization models and of two cosmological simulations implies that the volume filling factor of the IGM gas enriched to a metallicity logZ/Z\odot$$\gtrsim$ −3 should be of the order of $\sim$10–13 per cent. In conclusion, our results favour a scenario in which metals are found also outside the CGM of bright star-forming galaxies, possibly due to pollution by lower mass objects and/or to an early enrichment by the first sources. dc.description.sponsorship MV is supported by the ERC Starting Grant ‘cosmoIGM’ and PD51 INDARK grant. TSK acknowledges funding support from the ERC Starting Grant ‘cosmoIGM’, through grant GA-257670. MH was supported by the ERC Advanced Grant 320596 ‘The Emergence of Structure during the epoch of Reionisation’. PB is supported by the INAF PRIN-2014 grant ‘Windy black holes combing galaxy evolution’. Parts of this research were conducted by the Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020. dc.language English en dc.language.iso en en dc.publisher Oxford University Press dc.subject intergalactic medium en dc.subject quasars: absorption lines en dc.subject cosmology: observations en dc.subject galaxies:abundances en dc.title Metals in the z~3 intergalactic medium: results from an ultra-high signal-to-noise ratio UVES quasar spectrum en dc.type Article dc.description.version This is the final version of the article. It first appeared from Oxford University Press via http://dx.doi.org/10.1093/mnras/stw2161 en prism.endingPage 2707 prism.publicationDate 2016 en prism.publicationName Monthly Notices of the Royal Astronomical Society en prism.startingPage 2690 prism.volume 463 en dc.identifier.doi 10.17863/CAM.5975 dcterms.dateAccepted 2016-08-24 en rioxxterms.versionofrecord 10.1093/mnras/stw2161 en rioxxterms.version VoR en rioxxterms.licenseref.uri http://www.rioxx.net/licenses/all-rights-reserved en rioxxterms.licenseref.startdate 2016-09-28 en dc.contributor.orcid Haehnelt, Martin [0000-0001-8443-2393] dc.identifier.eissn 1365-2966 rioxxterms.type Journal Article/Review en pubs.funder-project-id European Research Council (320596) cam.orpheus.success Thu Jan 30 12:57:14 GMT 2020 - The item has an open VoR version. * rioxxterms.freetoread.startdate 2100-01-01
﻿