The host haloes of O I absorbers in the reionization epoch

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dc.contributor.authorFinlator, Kristian
dc.contributor.authorMuñoz, Joseph A.
dc.contributor.authorDave, Romeel
dc.contributor.authorOppenheimer, B. D.
dc.contributor.authorPeng Oh, S.
dc.contributor.authorÖzel, Feryal
dc.date.accessioned2017-07-17T12:54:48Z
dc.date.available2017-07-17T12:54:48Z
dc.date.issued2013
dc.description.abstractWe use a radiation hydrodynamic simulation of the hydrogen reionization epoch to study OI absorbers at z ∼ 6. The intergalactic medium (IGM) is reionized before it is enriched; hence, OI absorption originates within dark matter haloes. The predicted abundance of OI absorbers is in reasonable agreement with observations. At z = 10, ≈70 per cent of sightlines through atomically cooled haloes encounter a visible (NOI > 1014cm−2) column. Reionization ionizes and removes gas from haloes less massive than 108.4M , but 20 per cent of sightlines through more massive haloes encounter visible columns even at z = 5. The mass scale of absorber host haloes is 10–100 times smaller than the haloes of Lyman-break galaxies and Lyman α emitters, hence absorption probes the dominant ionizing sources more directly. OI absorbers have neutral hydrogen columns of 1019–1021 cm−2, suggesting a close resemblance between objects selected in OI and HI absorption. Finally, the absorption in the foreground of the z = 7.085 quasar ULAS J1120+0641 cannot originate in a dark matter halo because halo gas at the observed HI column density is enriched enough to violate the upper limits on the OI column. By contrast, gas at less than one-third the cosmic mean density satisfies the constraints. Hence, the foreground absorption likely originates in the IGM.en_US
dc.description.accreditationDepartment of HE and Training approved list
dc.identifier.citationFinlator, K. et al. (2013). The host haloes of O I absorbers in the reionization epoch. Monthly Notices of the Royal Astronomical Society, 436:1818–1835en_US
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/10566/3089
dc.language.isoenen_US
dc.publisherOxford University Pressen_US
dc.rightsPublisher retains copyright. Authors may archive the published version in their institutional repository.
dc.source.urihttp://dx.doi.org/10.1093/mnras/stt1697
dc.subjectGalaxiesen_US
dc.subjectEvolution – galaxiesen_US
dc.subjectFormation – galaxiesen_US
dc.subjectHaloes – galaxiesen_US
dc.subjectHigh redshift quasarsen_US
dc.subjectAbsorption lines – cosmologyen_US
dc.subjectTheoryen_US
dc.titleThe host haloes of O I absorbers in the reionization epochen_US
dc.typeArticleen_US

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