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    CO(1-0) survey of high-z radio galaxies: Alignment of molecular halo gas with distant radio sources

    236181_236181.pdf (3.866Mb)
    Access Status
    Open access
    Authors
    Emonts, B.
    Norris, R.
    Feain, I.
    Mao, M.
    Ekers, R.
    Miley, G.
    Seymour, Nick
    Röttgering, H.
    Villar-Martín, M.
    Sadler, E.
    Carilli, C.
    Mahony, E.
    de Breuck, C.
    Stroe, A.
    Pentericci, L.
    van Moorsel, G.
    Drouart, G.
    Ivison, R.
    Greve, T.
    Humphrey, A.
    Wylezalek, D.
    Tadhunter, C.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Emonts, B. and Norris, R. and Feain, I. and Mao, M. and Ekers, R. and Miley, G. and Seymour, N. et al. 2014. CO(1-0) survey of high-z radio galaxies: Alignment of molecular halo gas with distant radio sources. Monthly Notices of the Royal Astronomical Society. 438 (4): pp. 2898-2915.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stt2398
    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 ©: 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/41726
    Collection
    • Curtin Research Publications
    Abstract

    We present a CO(1–0) survey for cold molecular gas in a representative sample of 13 high-z radio galaxies (HzRGs) at 1.4 < z < 2.8, using the Australia Telescope Compact Array. We detect CO(1–0) emission associated with five sources: MRC 0114-211, MRC 0152-209, MRC 0156-252, MRC 1138-262 and MRC 2048-272. The CO(1–0) luminosities are in the range L′CO~(5--9)×1010 K km s−1 pc2. For MRC 0152-209 and MRC 1138-262, part of the CO(1–0) emission coincides with the radio galaxy, while part is spread on scales of tens of kpc and likely associated with galaxy mergers. The molecular gas mass derived for these two systems is MH2 ~ 6 × 1010 M☉ (MH2/L′CO = 0.8). For the remaining three CO-detected sources, the CO(1–0) emission is located in the halo (~50-kpc) environment. These three HzRGs are among the fainter far-IR emitters in our sample, suggesting that similar reservoirs of cold molecular halo gas may have been missed in earlier studies due to pre-selection of IR-bright sources. In all three cases, the CO(1–0) is aligned along the radio axis and found beyond the brightest radio hotspot, in a region devoid of 4.5 μm emission in Spitzer imaging. The CO(1–0) profiles are broad, with velocity widths of ∼1000–3600 km s−1. We discuss several possible scenarios to explain these halo reservoirs of CO(1–0). Following these results, we complement our CO(1–0) study with detections of extended CO from the literature and find at marginal statistical significance (95 per cent level) that CO in HzRGs is preferentially aligned towards the radio jet axis. For the eight sources in which we do not detect CO(1–0), we set realistic upper limits of L′CO~3--4×1010 K km s−1 pc2. Our survey reveals a CO(1–0) detection rate of 38 per cent, allowing us to compare the CO(1–0) content of HzRGs with that of other types of high-z galaxies.

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