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    The Redshift Evolution of Rest-UV Spectroscopic Properties in Lyman-break Galaxies at z ∼ 2–4

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    Du_2018_ApJ_860_75.pdf
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    Author
    Du, Xinnan
    Shapley, Alice E.
    Reddy, Naveen A.
    Jones, Tucker cc
    Stark, Daniel P.
    Steidel, Charles C.
    Strom, Allison L.
    Rudie, Gwen C.
    Erb, Dawn K.
    Ellis, Richard S. cc
    Pettini, Max
    Show allShow less
    Affiliation
    Univ Arizona
    Issue Date
    2018-06-10
    Keywords
    galaxies: evolution
    galaxies: high-redshift
    galaxies: ISM
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Xinnan Du et al 2018 ApJ 860 75
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    © 2018. The American Astronomical Society. All rights reserved.
    Collection Information
    This 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.
    Abstract
    We 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.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aabfcf
    Version
    Final published version
    Sponsors
    David & Lucile Packard Foundation
    Additional Links
    http://stacks.iop.org/0004-637X/860/i=1/a=75?key=crossref.8f654d58e14019e94481b331ddc7e446
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aabfcf
    Scopus Count
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    UA Faculty Publications

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