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    Galaxy cluster luminosities and colours, and their dependence on cluster mass and merger state

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    Author
    Mulroy, Sarah L.
    McGee, Sean L.
    Gillman, Steven
    Smith, Graham P.
    Haines, Chris P.
    Démoclès, Jessica
    Okabe, Nobuhiro
    Egami, Eiichi
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-12
    Keywords
    gravitational lensing: weak
    galaxies: clusters: general
    cosmology: observations
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    Galaxy cluster luminosities and colours, and their dependence on cluster mass and merger state 2017, 472 (3):3246 Monthly Notices of the Royal Astronomical Society
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    © 2017 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
    We study a sample of 19 galaxy clusters in the redshift range 0.15 < z < 0.30 with highly complete spectroscopic membership catalogues (to K < K*(z) + 1.5) from the Arizona Cluster Redshift Survey, individual weak-lensing masses and near-infrared data from the Local Cluster Substructure Survey, and optical photometry from the Sloan Digital Sky Survey. We fit the scaling relations between total cluster luminosity in each of six bandpasses (grizJK) and cluster mass, finding cluster luminosity to be a promising mass proxy with low intrinsic scatter sigma ln (L|M) of only similar to 10-20 per cent for all relations. At fixed overdensity radius, the intercept increases with wavelength, consistent with an old stellar population. The scatter and slope are consistent across all wavelengths, suggesting that cluster colour is not a function of mass. Comparing colour with indicators of the level of disturbance in the cluster, we find a narrower variety in the cluster colours of 'disturbed' clusters than of 'undisturbed' clusters. This trend is more pronounced with indicators sensitive to the initial stages of a cluster merger, e.g. the Dressler Schectman statistic. We interpret this as possible evidence that the total cluster star formation rate is 'standardized' in mergers, perhaps through a process such as a system-wide shock in the intracluster medium.
    ISSN
    0035-8711
    1365-2966
    DOI
    10.1093/mnras/stx2108
    Version
    Final published version
    Sponsors
    STFC Postgraduate Studentship
    Additional Links
    http://academic.oup.com/mnras/article/472/3/3246/4085639/Galaxy-cluster-luminosities-and-colours-and-their
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stx2108
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