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    Selecting and modelling remnant AGNs with limited spectral coverage

    91605.pdf (13.48Mb)
    Access Status
    Open access
    Authors
    Quici, B.
    Turner, Ross
    Seymour, Nick
    Hurley-Walker, Natasha
    Shabala, S.S.
    Ishwara-Chandra, C.H.
    Date
    2022
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Quici, B. and Turner, R.J. and Seymour, N. and Hurley-Walker, N. and Shabala, S.S. and Ishwara-Chandra, C.H. 2022. Selecting and modelling remnant AGNs with limited spectral coverage. Monthly Notices of the Royal Astronomical Society. 514 (3): pp. 3466-3484.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stac1328
    ISSN
    0035-8711
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT190100231
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. ©: 2022 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/91781
    Collection
    • Curtin Research Publications
    Abstract

    Quantifying the energetics and lifetimes of remnant radio-loud active galactic nuclei (AGNs) is much more challenging than for active sources due to the added complexity of accurately determining the time since the central black hole switched off. Independent spectral modelling of remnant lobes enables the derivation of the remnant ratio, Rrem (i.e. 'off-time/source age'); however, the requirement of high-frequency (≳5 GHz) coverage makes the application of this technique over large-area radio surveys difficult. In this work, we propose a new method, which relies on the observed brightness of backflow of Fanaroff-Riley type II lobes, combined with the Radio AGN in Semi-Analytic Environments (RAiSE) code, to measure the duration of the remnant phase. Sensitive radio observations of the remnant radio galaxy J2253-34 are obtained to provide a robust comparison of this technique with the canonical spectral analysis and modelling methods. We find that the remnant lifetimes modelled by each method are consistent; spectral modelling yields Rrem = 0.23 ± 0.02, compared to Rrem = 0.26 ± 0.02 from our new method. We examine the viability of applying our proposed technique to low-frequency radio surveys using mock radio source populations, and examine whether the technique is sensitive to any intrinsic properties of radio AGNs. Our results show that the technique can be used to robustly classify active and remnant populations, with the most confident predictions for the remnant ratio, and thus off-time, in the longest lived radio sources (>50 Myr) and those at higher redshifts (z > 0.1).

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