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    Mapping the Most Massive Overdensities through Hydrogen (MAMMOTH). II. Discovery of the Extremely Massive Overdensity BOSS1441 at z = 2.32

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    Cai_2017_ApJ_839_131.pdf
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    Author
    Cai, Zheng
    Fan, Xiaohui
    Bian, Fuyan
    Zabludoff, Ann
    Yang, Yujin
    Prochaska, J. Xavier
    McGreer, Ian
    Zheng, Zhen-Ya
    Kashikawa, Nobunari
    Wang, Ran
    Frye, Brenda
    Green, Richard
    Jiang, Linhua
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-04-25
    Keywords
    galaxies: clusters: general
    galaxies: high-redshift
    intergalactic medium
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Mapping the Most Massive Overdensities through Hydrogen (MAMMOTH). II. Discovery of the Extremely Massive Overdensity BOSS1441 at z = 2.32 2017, 839 (2):131 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    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
    Cosmological simulations suggest a strong correlation between high optical-depth Lya absorbers, which arise from the intergalactic medium, and 3D mass overdensities on scales of 10-30 h(-1) comoving Mpc. By examining the absorption spectra of similar to 80,000 QSO sight lines over a volume of 0.1 Gpc(3) in the Sloan Digital Sky Survey III (SDSS-III), we have identified an extreme overdensity, BOSS1441, which contains a rare group of strong Lya absorbers at z = 2.32 +/- 0.02. This absorber group is associated with six QSOs at the same redshift on a 30 comoving Mpc scale. Using Mayall/MOSAIC narrowband and broadband imaging, we detect Lya emitters (LAEs) down to 0.7 x L-Ly alpha ' * a and reveal a large-scale structure of LAEs in this field. Our follow-up LBT observations have spectroscopically confirmed 20 galaxies in the density peak. We show that BOSS1441 has an LAE overdensity of 10.8 +/- 2.6 on a 15 comoving Mpc scale, which could collapse to a massive cluster with M greater than or similar to 10(15) M-circle dot at z similar to 0. This overdensity is among the most massive large-scale structures at z similar to 2 discovered to date.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aa6a1a
    Version
    Final published version
    Sponsors
    US NSF grant [AST 11-07682]; NSF [AST-1412981, AST-0908280]; NASA [ADP-NNX10AD47G]; JSPS [15H03645]
    Additional Links
    http://stacks.iop.org/0004-637X/839/i=2/a=131?key=crossref.1e8fe7e94498ee79b854943a1e5e0b7e
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aa6a1a
    Scopus Count
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    UA Faculty Publications

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