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    A study of high-redshift AGN feedback in SZ cluster samples

    74735.pdf (5.657Mb)
    Access Status
    Open access
    Authors
    Bîrzan, L.
    Rafferty, D.
    Brüggen, M.
    Intema, Hubertus
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Bîrzan, L. and Rafferty, D. and Brüggen, M. and Intema, H. 2017. A study of high-redshift AGN feedback in SZ cluster samples. Monthly Notices of the Royal Astronomical Society. 471 (2): pp. 1766-1787.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/MNRAS/STX1505
    ISSN
    0035-8711
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/74450
    Collection
    • Curtin Research Publications
    Abstract

    We present a study of active galactic nucleus (AGN) feedback at higher redshifts (0.3 < z < 1.2) using Sunyaev-Zel'dovich selected samples of clusters from the South Pole Telescope and Atacama Cosmology Telescope surveys. In contrast to studies of nearby systems, we do not find a separation between cooling flow (CF) clusters and non-CF clusters based on the radio luminosity of the central radio source (cRS). This lack may be due to the increased incidence of galaxy-galaxy mergers at higher redshift that triggers AGN activity. In support of this scenario, we find evidence for evolution in the radio-luminosity function of the cRS, while the lower luminosity sources do not evolve much, the higher luminosity sources show a strong increase in the frequency of their occurrence at higher redshifts. We interpret this evolution as an increase in high-excitation radio galaxies (HERGs) in massive clusters at z > 0.6, implying a transition from HERG-mode accretion to lower power low-excitation radio galaxy (LERG)-mode accretion at intermediate redshifts. Additionally, we use local radio-to-jet power scaling relations to estimate feedback power and find that half of the CF systems in our sample probably have enough heating to balance cooling. However, we postulate that the local relations are likely not well suited to predict feedback power in high-luminosity HERGs, as they are derived from samples composed mainly of lower luminosity LERGs.

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