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dc.contributor.authorDu, Xinnan
dc.contributor.authorShapley, Alice E.
dc.contributor.authorReddy, Naveen A.
dc.contributor.authorJones, Tucker
dc.contributor.authorStark, Daniel P.
dc.contributor.authorSteidel, Charles C.
dc.contributor.authorStrom, Allison L.
dc.contributor.authorRudie, Gwen C.
dc.contributor.authorErb, Dawn K.
dc.contributor.authorEllis, Richard S.
dc.contributor.authorPettini, Max
dc.date.accessioned2018-08-29T21:02:16Z
dc.date.available2018-08-29T21:02:16Z
dc.date.issued2018-06-10
dc.identifier.citationXinnan Du et al 2018 ApJ 860 75en_US
dc.identifier.issn1538-4357
dc.identifier.doi10.3847/1538-4357/aabfcf
dc.identifier.urihttp://hdl.handle.net/10150/628613
dc.description.abstractWe present the first comprehensive evolutionary analysis of the rest-frame UV spectroscopic properties of star-forming galaxies at z similar to 2-4. We match samples at different redshifts in UV luminosity and stellar mass, and perform systematic measurements of spectral features and stellar population modeling. By creating composite spectra grouped according to Ly alpha equivalent width (EW) and various galaxy properties, we study the evolutionary trends among Ly alpha, low- and high-ionization interstellar (LIS and HIS) absorption features, and integrated galaxy properties. We also examine the redshift evolution of Ly alpha and LIS absorption kinematics, and fine-structure emission EWs. The connections among the strengths of Ly alpha, LIS lines, and dust extinction are redshift independent, as is the decoupling of the Ly alpha and HIS line strengths, and the bulk outflow kinematics as traced by the LIS lines. Stronger Ly alpha emission is observed at higher redshift at fixed UV luminosity, stellar mass, SFR, and age. Much of this variation in the average Ly alpha strength with redshift, and the variation in Ly alpha strength at fixed redshift, can be explained in terms of variations in the neutral gas covering fraction and/or dust content in the ISM and CGM. However, based on the connection between Ly alpha and C. III] emission strengths, we additionally find evidence for variations in the intrinsic production rate of Ly alpha photons at the highest Ly alpha EWs. The challenge now is to understand the observed evolution of the neutral gas covering fraction and dust extinction within a coherent model for galaxy formation, and make robust predictions for the escape of ionizing radiation at z > 6.en_US
dc.description.sponsorshipDavid & Lucile Packard Foundationen_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.relation.urlhttp://stacks.iop.org/0004-637X/860/i=1/a=75?key=crossref.8f654d58e14019e94481b331ddc7e446en_US
dc.rights© 2018. The American Astronomical Society. All rights reserved.en_US
dc.subjectgalaxies: evolutionen_US
dc.subjectgalaxies: high-redshiften_US
dc.subjectgalaxies: ISMen_US
dc.titleThe Redshift Evolution of Rest-UV Spectroscopic Properties in Lyman-break Galaxies at z ∼ 2–4en_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizonaen_US
dc.identifier.journalASTROPHYSICAL JOURNALen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleThe Astrophysical Journal
dc.source.volume860
dc.source.issue1
dc.source.beginpage75
refterms.dateFOA2018-08-29T21:02:17Z


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