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    Can intrinsic alignments of elongated low-mass galaxies be used to map the cosmic web at high redshift?

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    Author
    Pandya, Viraj cc
    Primack, Joel
    Behroozi, Peter
    Dekel, Avishai cc
    Zhang, Haowen
    Eckholm, Elliot
    Faber, Sandra M
    Ferguson, Henry C
    Giavalisco, Mauro cc
    Guo, Yicheng cc
    Hathi, Nimish cc
    Kodra, Dritan
    Koekemoer, Anton M
    Koo, David C
    Newman, Jeffrey
    van der Wel, Arjen
    Show allShow less
    Affiliation
    Univ Arizona, Dept Astron
    Univ Arizona, Steward Observ
    Issue Date
    2019-08-02
    Keywords
    galaxies: dwarf
    galaxies: high-redshift
    galaxies: statistics
    galaxies: structure
    dark matter
    large-scale structure of Universe
    
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    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    Viraj Pandya, Joel Primack, Peter Behroozi, Avishai Dekel, Haowen Zhang, Elliot Eckholm, Sandra M Faber, Henry C Ferguson, Mauro Giavalisco, Yicheng Guo, Nimish Hathi, Dritan Kodra, Anton M Koekemoer, David C Koo, Jeffrey Newman, Arjen van der Wel, Can intrinsic alignments of elongated low-mass galaxies be used to map the cosmic web at high redshift?, Monthly Notices of the Royal Astronomical Society, Volume 488, Issue 4, October 2019, Pages 5580–5593, https://doi.org/10.1093/mnras/stz2129
    Journal
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
    Rights
    Copyright © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
    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
    Hubble Space Telescope observations show that low-mass () galaxies at high redshift (z= 1.0-2.5) tend to be elongated (prolate) rather than disky (oblate) or spheroidal. This is explained in zoom-in cosmological hydrodynamical simulations by the fact that these galaxies are forming in cosmic web filaments where accretion happens preferentially along the direction of elongation. We ask whether the elongated morphology of these galaxies allows them to be used as effective tracers of cosmic web filaments at high redshift via their intrinsic alignments. Using mock light cones and spectroscopically confirmed galaxy pairs from the Cosmic Assembly Near-infared Deep Extragalactic Legacy Survey (CANDELS), we test two types of alignments: (1) between the galaxy major axis and the direction to nearby galaxies of any mass and (2) between the major axes of nearby pairs of low-mass, likely prolate, galaxies. The mock light cones predict strong signals in 3D real space, 3D redshift space, and 2D projected redshift space for both types of alignments (assuming prolate galaxy orientations are the same as those of their host prolate haloes), but we do not detect significant alignment signals in CANDELS observations. However, we show that spectroscopic redshifts have been obtained for only a small fraction of highly elongated galaxies, and accounting for spectroscopic incompleteness and redshift errors significantly degrades the 2D mock signal. This may partly explain the alignment discrepancy and highlights one of several avenues for future work.
    ISSN
    0035-8711
    DOI
    10.1093/mnras/stz2129
    Version
    Final published version
    Sponsors
    National Science FoundationNational Science Foundation (NSF) [1339067]; NASA from the Space Telescope Science Institute [HST-AR-14578.001-A]; NASANational Aeronautics & Space Administration (NASA) [NAS 5-26555]
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stz2129
    Scopus Count
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