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    The ATLAS 5.5 GHz survey of the extended Chandra Deep Field South: The second data release

    251206.pdf (1.985Mb)
    Access Status
    Open access
    Authors
    Huynh, M.
    Bell, M.
    Hopkins, A.
    Norris, R.
    Seymour, Nick
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Huynh, M. and Bell, M. and Hopkins, A. and Norris, R. and Seymour, N. 2015. The ATLAS 5.5 GHz survey of the extended Chandra Deep Field South: The second data release. Monthly Notices of the Royal Astronomical Society. 454 (1): pp. 952-972.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stv2012
    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 ©: 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/52507
    Collection
    • Curtin Research Publications
    Abstract

    We present a new image of the 5.5 GHz radio emission from the extended Chandra Deep Field South. Deep radio observations at 5.5 GHz were obtained in 2010 and presented in the first data release. A further 76 h of integration has since been obtained, nearly doubling the integration time. This paper presents a new analysis of all the data. The new image reaches 8.6 µJy rms, an improvement of about 40 per cent in sensitivity. We present a new catalogue of 5.5 GHz sources, identifying 212 source components, roughly 50 per cent more than were detected in the first data release. Source counts derived from this sample are consistent with those reported in the literature for S5.5 GHz > 0.1 mJy but significantly lower than published values in the lowest flux density bins (S5.5 GHz < 0.1 mJy), where we have more detected sources and improved statistical reliability. The 5.5 GHz radio sources were matched to 1.4 GHz sources in the literature and we find a mean spectral index of -0.35 ± 0.10 for S5.5 GHz > 0.5 mJy, consistent with the flattening of the spectral index observed in 5 GHz sub-mJy samples. The median spectral index of the whole sample is amed =-0.58, indicating that these observations may be starting to probe the star-forming population. However, even at the faintest levels (0.05 < S5.5 GHz < 0.1 mJy), 39 per cent of the 5.5 GHz sources have flat or inverted radio spectra. Four flux density measurements from our data, across the full 4.5-6.5 GHz bandwidth, are combined with those from literature and we find 10 per cent of sources (S5.5 GHz ? 0.1 mJy) show significant curvature in their radio spectral energy distribution spanning 1.4-9 GHz. © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.

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