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    Intrinsic alignment in redMaPPer clusters – II. Radial alignment of satellites towards cluster centres

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    Author
    Huang, Hung-Jin
    Mandelbaum, Rachel cc
    Freeman, Peter E
    Chen, Yen-Chi
    Rozo, Eduardo
    Rykoff, Eli
    Affiliation
    Univ Arizona, Dept Phys
    Issue Date
    2018-03
    Keywords
    galaxies: clusters: general
    large-scale structure of Universe
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    Intrinsic alignment in redMaPPer clusters – II. Radial alignment of satellites towards cluster centres 2018, 474 (4):4772 Monthly Notices of the Royal Astronomical Society
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    © 2017 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
    We study the orientations of satellite galaxies in redMaPPer clusters constructed from the Sloan Digital Sky Survey at 0.1 < z < 0.35 to determine whether there is any preferential tendency for satellites to point radially towards cluster centres. We analyse the satellite alignment (SA) signal based on three shape measurement methods (re-Gaussianization, de Vaucouleurs, and isophotal shapes), which trace galaxy light profiles at different radii. The measured SA signal depends on these shape measurement methods. We detect the strongest SA signal in isophotal shapes, followed by de Vaucouleurs shapes. While no net SA signal is detected using re-Gaussianization shapes across the entire sample, the observed SA signal reaches a statistically significant level when limiting to a subsample of higher luminosity satellites. We further investigate the impact of noise, systematics, and real physical isophotal twisting effects in the comparison between the SA signal detected via different shape measurement methods. Unlike previous studies, which only consider the dependence of SA on a few parameters, here we explore a total of 17 galaxy and cluster properties, using a statistical model averaging technique to naturally account for parameter correlations and identify significant SA predictors. We find that the measured SA signal is strongest for satellites with the following characteristics: higher luminosity, smaller distance to the cluster centre, rounder in shape, higher bulge fraction, and distributed preferentially along the major axis directions of their centrals. Finally, we provide physical explanations for the identified dependences and discuss the connection to theories of SA.
    ISSN
    0035-8711
    1365-2966
    DOI
    10.1093/mnras/stx2995
    Version
    Final published version
    Sponsors
    National Science Foundation [AST-1313169]; NASA ROSES [12-EUCLID12-0004]
    Additional Links
    http://academic.oup.com/mnras/article/474/4/4772/4655051
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stx2995
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