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    Intrinsic alignments in redMaPPer clusters – I. Central galaxy alignments and angular segregation of satellites

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    Author
    Huang, Hung-Jin
    Mandelbaum, Rachel
    Freeman, Peter E.
    Chen, Yen-Chi
    Rozo, Eduardo
    Rykoff, Eli
    Baxter, Eric J.
    Affiliation
    Univ Arizona, Dept Phys
    Issue Date
    2016-11-21
    Keywords
    galaxies: clusters: general
    large-scale structure of Universe
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    Intrinsic alignments in redMaPPer clusters – I. Central galaxy alignments and angular segregation of satellites 2016, 463 (1):222 Monthly Notices of the Royal Astronomical Society
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    © 2016 The Authors. 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
    The shapes of cluster central galaxies are not randomly oriented, but rather exhibit coherent alignments with the shapes of their parent clusters as well as with the surrounding large-scale structures. In this work, we aim to identify the galaxy and cluster quantities that most strongly predict the central galaxy alignment phenomenon among a large parameter space with a sample of 8237 clusters and 94 817 members within 0.1 < z < 0.35, based on the red-sequence Matched-filter Probabilistic Percolation cluster catalogue constructed from the Sloan Digital Sky Survey. We first quantify the alignment between the projected central galaxy shapes and the distribution of member satellites, to understand what central galaxy and cluster properties most strongly correlate with these alignments. Next, we investigate the angular segregation of satellites with respect to their central galaxy major axis directions, to identify the satellite properties that most strongly predict their angular segregation. We find that central galaxies are more aligned with their member galaxy distributions in clusters that are more elongated and have higher richness, and for central galaxies with larger physical size, higher luminosity and centring probability, and redder colour. Satellites with redder colour, higher luminosity, located closer to the central galaxy, and with smaller ellipticity show a stronger angular segregation towards their central galaxy major axes. Finally, we provide physical explanations for some of the identified correlations, and discuss the connection to theories of central galaxy alignments, the impact of primordial alignments with tidal fields, and the importance of anisotropic accretion.
    ISSN
    0035-8711
    1365-2966
    DOI
    10.1093/mnras/stw1982
    Version
    Final published version
    Sponsors
    National Science Foundation [AST-1313169]; William S. Dietrich II Presidential PhD Fellowship Award; US Department of Energy [DE-SC0007901]
    Additional Links
    https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw1982
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stw1982
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