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    Preprocessing among the Infalling Galaxy Population of EDisCS Clusters

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    Just_2019_ApJ_885_6.pdf
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    Author
    Just, Dennis W.
    Kirby, Matthew
    Zaritsky, Dennis
    Rudnick, Gregory
    Desjardins, Tyler
    Cool, Richard
    Moustakas, John
    Clowe, Douglas
    Lucia, Gabriella De
    Aragón-Salamanca, Alfonso cc
    Desai, Vandana cc
    Finn, Rose
    Halliday, Claire
    Jablonka, Pascale
    Mann, Justin
    Poggianti, Bianca cc
    Bian, Fu-Yan
    Liebst, Kelley
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Univ Arizona, Dept Phys
    Univ Arizona, MMT Observ
    Issue Date
    2019-10-24
    Keywords
    galaxies: distances and redshifts
    galaxies: evolution
    galaxies: interactions
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Dennis W. Just et al 2019 ApJ 885 6
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    Copyright © 2019. 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 present results from a low-resolution spectroscopic survey for 21 galaxy clusters at 0.4 < z < 0.8 selected from the ESO Distant Cluster Survey. We measured spectra using the low-dispersion prism in IMACS on the Magellan Baade telescope and calculate redshifts with an accuracy of sigma(z) = 0.007. We find 1763 galaxies that are brighter than R = 22.9 in the large-scale cluster environs. We identify the galaxies expected to be accreted by the clusters as they evolve to z = 0 using spherical infall models and find that similar to 30%-70% of the z = 0 cluster population lies outside the virial radius at z similar to 0.6. For analogous clusters at z = 0, we calculate that the ratio of galaxies that have fallen into the clusters since z similar to 0.6 to those that were already in the core at that redshift is typically between similar to 0.3 and 1.5. This wide range of ratios is due to intrinsic scatter and is not a function of velocity dispersion, so a variety of infall histories is to be expected for clusters with current velocity dispersions of 300 km s(-1) less than or similar to sigma less than or similar to 1200 km s(-1). Within the infall regions of z similar to 0.6 clusters, we find a larger red fraction of galaxies than in the field and greater clustering among red galaxies than blue. We interpret these findings as evidence of "preprocessing," where galaxies in denser local environments have their star formation rates affected prior to their aggregation into massive clusters, although the possibility of backsplash galaxies complicates the interpretation.
    ISSN
    0004-637X
    DOI
    10.3847/1538-4357/ab44a0
    Version
    Final published version
    Sponsors
    NASA LTSA award [NNG05GE82G]; NASA GALEX grant [NNX11AI47G]; European Research Council under European Community's Seventh Framework Programme (FP7/2007-2013)/ERC grant [202781]; Swiss National Science Foundation (SNSF)Swiss National Science Foundation (SNSF)
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/ab44a0
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