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    A radio spectral index map and catalogue at 147-1400 MHz covering 80 per cent of the sky

    74278.pdf (5.358Mb)
    Access Status
    Open access
    Authors
    de Gasperin, F.
    Intema, Hubertus
    Frail, D.
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    de Gasperin, F. and Intema, H. and Frail, D. 2018. A radio spectral index map and catalogue at 147-1400 MHz covering 80 per cent of the sky. Monthly Notices of the Royal Astronomical Society. 474 (4): pp. 5008-5022.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stx3125
    ISSN
    0035-8711
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/73993
    Collection
    • Curtin Research Publications
    Abstract

    The radio spectral index is a powerful probe for classifying cosmic radio sources and understanding the origin of the radio emission. Combining data at 147 MHz and 1.4 GHz from the TIFR GMRT Sky Survey (TGSS) and the NRAO VLA Sky Survey (NVSS), we produced a large-area radio spectral index map of ~80 per cent of the sky (Dec. > - 40 deg), as well as a radio spectral index catalogue containing 1396 515 sources, of which 503 647 are not upper or lower limits. Almost every TGSS source has a detected counterpart, while this is true only for 36 per cent of NVSS sources. We released both the map and the catalogue to the astronomical community. The catalogue is analysed to discover systematic behaviours in the cosmic radio population. We find a differential spectral behaviour between faint and bright sources as well as between compact and extended sources. These trends are explained in terms of radio galaxy evolution. We also confirm earlier reports of an excess of steep-spectrum sources along the galactic plane. This corresponds to 86 compact and steep-spectrum source in excess compared to expectations. The properties of this excess are consistent with normal non-recycled pulsars, which may have been missed by pulsation searches due to larger than average scattering along the line of sight.

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