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    Galaxy protocluster candidates around z ~ 2.4 radio galaxies

    236208_236208.pdf (3.613Mb)
    Access Status
    Open access
    Authors
    Hatch, N.
    De Breuck, C.
    Galametz, A.
    Miley, G.
    Overzier, R.
    Röttgering, H.
    Doherty, M.
    Kodama, T.
    Kurk, J.
    Seymour, Nick
    Venemans, B.
    Vernet, J.
    Zirm, A.
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Hatch, N. and De Breuck, C. and Galametz, A. and Miley, G. and Overzier, R. and Röttgering, H. and Doherty, M. et al. 2011. Galaxy protocluster candidates around z ~ 2.4 radio galaxies. Monthly Notices of the Royal Astronomical Society. 410 (3): pp. 1537-1549.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1111/j.1365-2966.2010.17538.x
    ISSN
    0035-8711
    School
    Department of Physics and Astronomy
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2011 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/11418
    Collection
    • Curtin Research Publications
    Abstract

    We study the environments of six radio galaxies at 2.2 < z < 2.6 using wide-field near-infrared images. We use colour cuts to identify galaxies in this redshift range, and find that three of the radio galaxies are surrounded by significant surface overdensities of such galaxies. The excess galaxies that comprise these overdensities are strongly clustered, suggesting they are physically associated. The colour distribution of the galaxies responsible for the overdensity is consistent with those of galaxies that lie within a narrow redshift range at z~ 2.4. Thus the excess galaxies are consistent with being companions of the radio galaxies. The overdensities have estimated masses in excess of 1014 M☉, and are dense enough to collapse into virialized structures by the present day; these structures may evolve into groups or clusters of galaxies. A flux-limited sample of protocluster galaxies with K < 20.6 mag is derived by statistically subtracting the foreground and background galaxies. The colour distribution of the protocluster galaxies is bimodal, consisting of a dominant blue sequence, comprising 77 ± 10 per cent of the galaxies and a poorly populated red sequence. The blue protocluster galaxies have similar colours to local star-forming irregular galaxies (U−VAB~ 0.6), suggesting that most protocluster galaxies are still forming stars at the observed epoch. The blue colours and lack of a dominant protocluster red sequence imply that these cluster galaxies form the bulk of their stars at z≲ 3.

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