dc.contributor.author Rosdahl, J dc.contributor.author Katz, H dc.contributor.author Blaizot, J dc.contributor.author Kimm, T dc.contributor.author Michel-Dansac, L dc.contributor.author Garel, T dc.contributor.author Haehnelt, Martin dc.contributor.author Ocvirk, P dc.contributor.author Teyssier, R dc.date.accessioned 2018-10-31T06:50:57Z dc.date.available 2018-10-31T06:50:57Z dc.date.issued 2018-09 dc.identifier.issn 0035-8711 dc.identifier.uri https://www.repository.cam.ac.uk/handle/1810/284426 dc.description.abstract We present the SPHINX suite of cosmological adaptive mesh refinement simulations, the first radiation-hydrodynamical simulations to simultaneously capture large-scale reionization and the escape of ionizing radiation from thousands of resolved galaxies. Our $5$ and $10$ co-moving Mpc volumes resolve haloes down to the atomic cooling limit and model the inter-stellar medium with better than $\approx10$ pc resolution. The project has numerous goals in improving our understanding of reionization and making predictions for future observations. In this first paper we study how the inclusion of binary stars in computing stellar luminosities impacts reionization, compared to a model that includes only single stars. Owing to the suppression of galaxy growth via strong feedback, our galaxies are in good agreement with observational estimates of the galaxy luminosity function. We find that binaries have a significant impact on the timing of reionization: with binaries, our boxes are $99.9$ percent ionized by volume at $z\approx 7$, while without them our volumes fail to reionize by $z=6$. These results are robust to changes in volume size, resolution, and feedback efficiency. The escape of ionizing radiation from individual galaxies varies strongly and frequently. On average, binaries lead to escape fractions of $\approx 7-10$ percent, about $3.5$ times higher than with single stars only. The higher escape fraction is a result of a shallower decline in ionizing luminosity with age, and is the primary reason for earlier reionization, although the higher integrated luminosity with binaries also plays a sub-dominant role. dc.publisher Oxford University Press (OUP) dc.title The SPHINX cosmological simulations of the first billion years: The impact of binary stars on reionization dc.type Article prism.endingPage 1016 prism.issueIdentifier 1 prism.publicationDate 2018 prism.publicationName Monthly Notices of the Royal Astronomical Society prism.startingPage 994 prism.volume 479 dc.identifier.doi 10.17863/CAM.31798 dcterms.dateAccepted 2018-06-17 rioxxterms.versionofrecord 10.1093/mnras/sty1655 rioxxterms.licenseref.uri http://www.rioxx.net/licenses/all-rights-reserved rioxxterms.licenseref.startdate 2018-09-01 dc.contributor.orcid Haehnelt, Martin [0000-0001-8443-2393] dc.identifier.eissn 1365-2966 dc.publisher.url http://dx.doi.org/10.1093/mnras/sty1655 rioxxterms.type Journal Article/Review pubs.funder-project-id European Research Council (320596) pubs.funder-project-id Science and Technology Facilities Council (ST/N000927/1) cam.issuedOnline 2018-06-23 cam.orpheus.success Thu Jan 30 10:54:10 GMT 2020 - The item has an open VoR version. rioxxterms.freetoread.startdate 2100-01-01
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