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    LoCuSS: exploring the selection of faint blue background galaxies for cluster weak-lensing

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    Author
    Ziparo, Felicia
    Smith, Graham P.
    Okabe, Nobuhiro
    Haines, Chris P.
    Pereira, Maria J.
    Egami, Eiichi
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2016-12-21
    Keywords
    gravitational lensing: weak
    galaxies: clusters: general
    galaxies: general
    galaxies: photometry
    galaxies: statistics
    
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    Publisher
    OXFORD UNIV PRESS
    Citation
    LoCuSS: exploring the selection of faint blue background galaxies for cluster weak-lensing 2016, 463 (4):4004 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
    Cosmological constraints from galaxy clusters rely on accurate measurements of the mass and internal structure of clusters. An important source of systematic uncertainty in cluster mass and structure measurements is the secure selection of background galaxies that are gravitationally lensed by clusters. This issue has been shown to be particular severe for faint blue galaxies. We therefore explore the selection of faint blue background galaxies, by reference to photometric redshift catalogues derived from the Cosmological Evolution Survey (COSMOS) and our own observations of massive galaxy clusters at z similar or equal to 0.2. We show that methods relying on photometric redshifts of galaxies in/behind clusters based on observations through five filters, and on deep 30-band COSMOS photometric redshifts are both inadequate to identify safely faint blue background galaxies with the same 1 per cent contamination level that we have achieved with red galaxies. This is due to the small number of filters used by the former, and absence of massive galaxy clusters at redshifts of interest in the latter. Nevertheless, our least contaminated blue galaxy sample yields stacked weak-lensing results consistent with our previously published results based on red galaxies, and we show that the stacked clustercentric number density profile of these faint blue galaxies is consistent with expectations from consideration of the lens magnification signal of the clusters. Indeed, the observed number density of blue background galaxies changes by similar to 10-30 per cent across the radial range over which other surveys assume it to be flat.
    ISSN
    0035-8711
    1365-2966
    DOI
    10.1093/mnras/stw2192
    Version
    Final published version
    Sponsors
    Science and Technology Facilities Council; Royal Society; Ministry of Education, Culture, Sports, Science, and Technology of Japan [26800097]; Core Research for Energetic Universe in Hiroshima University (MEXT program for promoting the enhancement of research universities, Japan); 'World Premier International Research Center Initiative (WPI Initiative)'; Funds for the Development of Human Resources in Science and Technology under MEXT, Japan; CONICYT Anillo project [ACT-1122]
    Additional Links
    https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw2192
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stw2192
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