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    CO line emission in the halo of a radio galaxy at z = 2.6

    Access Status
    Open access via publisher
    Authors
    Nesvadba, N.
    Neri, R.
    De Breuck, C.
    Lehnert, M.
    Dowries, D.
    Walter, F.
    Omont, A.
    Boulanger, F.
    Seymour, Nick
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Nesvadba, N. and Neri, R. and De Breuck, C. and Lehnert, M. and Dowries, D. and Walter, F. and Omont, A. et al. 2009. CO line emission in the halo of a radio galaxy at z = 2.6. Monthly Notices of the Royal Astronomical Society: Letters. 395 (1): pp. L16-L20.
    Source Title
    Monthly Notices of the Royal Astronomical Society: Letters
    DOI
    10.1111/j.1745-3933.2009.00631.x
    ISSN
    1745-3933
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/47368
    Collection
    • Curtin Research Publications
    Abstract

    We report the detection of luminous CO(3-2) line emission in the halo of the z = 2.6 radio galaxy (HzRG) TXS0828+193, which has no detected counterpart at optical to mid-infrared wavelengths implying a stellar mass ? few × 109 M and relatively low star formation rates. With the IRAM Plateau de Bure Interferometer (PdBI), we find two CO emission-line components at the same position at ~80 kpc distance from the HzRG along the axis of the radio jet, with different blueshifts of few 100 km s-1 relative to the HzRG and a total luminosity of ~2 × 1010 K km s-1 pc2 detected at a total significance of ~8s HzRGs have significant galaxy overdensities and extended haloes of metal-enriched gas often with embedded clouds or filaments of denser material, and likely trace very massive dark matter haloes. The CO emission may be associated with a gas-rich, low-mass satellite galaxy with very little ongoing star formation, in contrast to all previous CO detections of galaxies at similar redshifts. Alternatively, the CO may be related to a gas cloud or filament and perhaps jet-induced gas cooling in the outer halo, somewhat in analogy with extended CO emission found in low-redshift galaxy clusters. © 2009 The Authors. Journal compilation © 2009 RAS.

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