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dc.contributor.authorErkal, Denisen
dc.date.accessioned2015-07-23T13:49:34Z
dc.date.available2015-07-23T13:49:34Z
dc.date.issued2015-06-01en
dc.identifier.citationMonthly Notices of the Royal Astronomical Society 451 (1): 904-916. doi: 10.1093/mnras/stv980en
dc.identifier.issn0035-8711
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/249026
dc.description.abstractIn this work, I investigate the properties of Lyman limit systems (LLSs) using state-of-the-art zoom-in cosmological galaxy formation simulations with on the fly radiative transfer, which includes both the cosmic UV background (UVB) and local stellar sources. I compare the simulation results to observations of the incidence frequency of LLSs and the H i column density distribution function over the redshift range z = 2–5 and find good agreement. I explore the connection between LLSs and their host haloes and find that LLSs reside in haloes with a wide range of halo masses with a nearly constant covering fraction within a virial radius. Over the range z = 2–5, I find that more than half of the LLSs reside in haloes with M < 10^10 h^−1 M⊙, indicating that absorption line studies of LLSs can probe these low-mass galaxies which H2-based star formation models predict to have very little star formation. I study the physical state of individual LLSs and test a simple model which encapsulates many of their properties. I confirm that LLSs have a characteristic absorption length given by the Jeans length and that they are in photoionization equilibrium at low column densities. Finally, I investigate the self-shielding of LLSs to the UVB and explore how the non-sphericity of LLSs affects the photoionization rate at a given N_HI. I find that at z ≈ 3, LLSs have an optical depth of unity at a column density of ∼10^18 cm^−2 and that this is the column density which characterizes the onset of self-shielding.
dc.description.sponsorshipThis work was supported in part by the NSF grant AST-0908063, and by the NASA grant NNX- 09AJ54G. The simulations used in this work have been performed on the Joint Fermilab - KICP Supercomputing Cluster, supported by grants from Fermilab, Kavli Institute for Cosmological Physics, and the University of Chicago.
dc.languageEnglishen
dc.language.isoenen
dc.publisherOUP
dc.subjectgalaxies: formationen
dc.subjectgalaxies: high-redshiften
dc.subjectmethods: numericalen
dc.subjectquasars: absorption linesen
dc.titleInvestigating the Physics and Environment of Lyman Limit Systems in Cosmological Simulationsen
dc.typeArticle
dc.description.versionThis is the final version. It was first published by OUP at http://mnras.oxfordjournals.org/content/451/1/904.abstract?sid=5f7e04bf-6176-4b8f-bc81-ae4f70107d18.en
prism.endingPage916
prism.publicationDate2015en
prism.publicationNameMonthly Notices of the Royal Astronomical Societyen
prism.startingPage904
prism.volume451en
dc.rioxxterms.funderNSF
dc.rioxxterms.projectidAST-0908063
rioxxterms.versionofrecord10.1093/mnras/stv980en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2015-06-01en
dc.identifier.eissn1365-2966
rioxxterms.typeJournal Article/Reviewen


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