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    Illuminating the past 8 billion years of cold gas towards two gravitationally lensed quasars

    250862.pdf (3.068Mb)
    Access Status
    Open access
    Authors
    Allison, J.
    Moss, V.
    Macquart, Jean-Pierre
    Curran, S.
    Duchesne, S.
    Mahony, E.
    Sadler, E.
    Whiting, M.
    Bannister, K.
    Chippendale, A.
    Edwards, P.
    Harvey-Smith, L.
    Heywood, I.
    Indermuehle, B.
    Lenc, E.
    Marvil, J.
    McConnell, D.
    Sault, R.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Allison, J. and Moss, V. and Macquart, J. and Curran, S. and Duchesne, S. and Mahony, E. and Sadler, E. et al. 2017. Illuminating the past 8 billion years of cold gas towards two gravitationally lensed quasars. Monthly Notices of the Royal Astronomical Society. 465 (4): pp. 4450-4467.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stw2860
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society

    URI
    http://hdl.handle.net/20.500.11937/48974
    Collection
    • Curtin Research Publications
    Abstract

    Using the Boolardy Engineering Test Array of the Australian Square Kilometre Array Pathfinder (ASKAP BETA), we have carried out the first z = 0-1 survey for HI and OH absorption towards the gravitationally lensed quasars PKS B1830-211 and MGJ0414+0534. Although we detected all previously reported intervening systems towards PKS B1830-211, in the case of MG J0414+0534, three systems were not found, indicating that the original identifications may have been confused with radio frequency interference. Given the sensitivity of our data, we find that our detection yield is consistent with the expected frequency of intervening HI systems estimated from previous surveys for 21-cm emission in nearby galaxies and z ~ 3 damped Lyman a absorbers. We find spectral variability in the z = 0.886 face-on spiral galaxy towards PKS B1830-211 from observations undertaken with the Westerbork Synthesis Radio Telescope in 1997/1998 and ASKAP BETA in 2014/2015. The HI equivalent width varies by a few per cent over approximately yearly time-scales. This long-term spectral variability is correlated between the north-east and south-west images of the core, and with the total flux density of the source, implying that it is observationally coupled to intrinsic changes in the quasar. The absence of any detectable variability in the ratio of HI associated with the two core images is in stark contrast to the behaviour previously seen in the molecular lines. We therefore infer that coherent opaque HI structures in this galaxy are larger than the parsec-scale molecular clouds found at mm-wavelengths.

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