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    Probing the Metal Enrichment of the Intergalactic Medium at z = 5–6 Using the Hubble Space Telescope

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    Author
    Cai, Zheng cc
    Fan, Xiaohui cc
    Davé, Romeel cc
    Finlator, Kristian
    Oppenheimer, Ben cc
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-10-26
    Keywords
    galaxies: high-redshift
    intergalactic medium
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Probing the Metal Enrichment of the Intergalactic Medium at z = 5–6 Using the Hubble Space Telescope 2017, 849 (1):L18 The Astrophysical Journal
    Journal
    The Astrophysical Journal Letters
    Rights
    © 2017. 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 test the galactic outflow model by probing associated galaxies of four strong intergalactic C IV absorbers at z = 5-6 using the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) ramp narrowband filters. The four strong C IV absorbers reside at z = 5.74, 5.52, 4.95, and 4.87, with column densities ranging from N-C IV = 10(13.8) to 10(14.8) cm(-2). At z = 5.74, we detect an i-dropout Ly alpha emitter (LAE) candidate with a projected impact parameter of 42 physical kpc from the C IV absorber. This LAE candidate has a Ly alpha-based star formation rate (SFRLy alpha) of 2 M-circle dot yr(-1) and a UV-based SFR of 4 M-circle dot yr(-1). Although we cannot completely rule out that this i-dropout emitter may be an [O II] interloper, its measured properties are consistent with the C IV powered galaxy at z = 5.74. For C IV absorbers at z = 4.95 and z = 4.87, although we detect two LAE candidates with impact parameters of 160 and 200 kpc, such distances are larger than that predicted from the simulations. Therefore, we treat them as nondetections. For the system at z = 5.52, we do not detect LAE candidates, placing a 3 sigma upper limit of SFRLy alpha approximate to 1.5 M-circle dot yr(-1). In summary, in these four cases, we only detect one plausible C IV source at z = 5.74. Combining the modest SFR of the one detection and the three nondetections, our HST observations strongly support that smaller galaxies (SFRLy alpha less than or similar to 2 M-circle dot yr(-1)) are main sources of intergalactic C IV absorbers, and such small galaxies play a major role in the metal enrichment of the intergalactic medium at z greater than or similar to 5.
    ISSN
    2041-8213
    DOI
    10.3847/2041-8213/aa8fc6
    Version
    Final published version
    Sponsors
    US NSF [AST 11-07682]; NASA - Space Telescope Science Institute [HST-HF2-51370]; NASA [NAS 5-26555]
    Additional Links
    http://stacks.iop.org/2041-8205/849/i=1/a=L18?key=crossref.3bc4a5302014cb298e07e8b007dd82b4
    ae974a485f413a2113503eed53cd6c53
    10.3847/2041-8213/aa8fc6
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    UA Faculty Publications

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