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    The LOFAR window on star-forming galaxies and AGNs – curved radio SEDs and IR–radio correlation at 0<z<2.5

    73972.pdf (6.197Mb)
    Access Status
    Open access
    Authors
    Calistro Rivera, G.
    Williams, W.
    Hardcastle, M.
    Duncan, K.
    Röttgering, H.
    Best, P.
    Brüggen, M.
    Chyzy, K.
    Conselice, C.
    de Gasperin, F.
    Engels, D.
    Gürkan, G.
    Intema, Hubertus
    Jarvis, M.
    Mahony, E.
    Miley, G.
    Morabito, L.
    Prandoni, I.
    Sabater, J.
    Smith, D.
    Tasse, C.
    van der Werf, P.
    White, G.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Calistro Rivera, G. and Williams, W. and Hardcastle, M. and Duncan, K. and Röttgering, H. and Best, P. and Brüggen, M. et al. 2017. The LOFAR window on star-forming galaxies and AGNs – curved radio SEDs and IR–radio correlation at 0<z<2.5. Monthly Notices of the Royal Astronomical Society. 469 (3): pp. 3468-3488.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stx1040
    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/20.500.11937/73687
    Collection
    • Curtin Research Publications
    Abstract

    We present a study of the low-frequency radio properties of star-forming (SF) galaxies and active galactic nuclei (AGNs) up to redshift z = 2.5. The new spectral window probed by the Low Frequency Array (LOFAR) allows us to reconstruct the radio continuum emission from 150 MHz to 1.4 GHz to an unprecedented depth for a radio-selected sample of 1542 galaxies in ~7deg2 of the LOFAR Bootes field. Using the extensive multiwavelength data set available in Bootes and detailed modelling of the far-infrared to ultraviolet spectral energy distribution (SED), we are able to separate the star formation (N = 758) and the AGN (N = 784) dominated populations. We study the shape of the radio SEDs and their evolution across cosmic time and find significant differences in the spectral curvature between the SF galaxy and AGN populations. While the radio spectra of SF galaxies exhibit a weak but statistically significant flattening, AGN SEDs show a clear trend to become steeper towards lower frequencies. No evolution of the spectral curvature as a function of redshift is found for SF galaxies or AGNs. We investigate the redshift evolution of the infrared-radio correlation for SF galaxies and find that the ratio of total infrared to 1.4-GHz radio luminosities decreases with increasing redshift: q1.4 GHz = (2.45 ± 0.04) (1 + z)-0.15 ± 0.03. Similarly, q150MHz shows a redshift evolution following q150 GHz = (1.72 ± 0.04) (1 + z)-0.22 ± 0.05. Calibration of the 150MHz radio luminosity as a star formation rate tracer suggests that a single power-law extrapolation from q1.4 GHz is not an accurate approximation at all redshifts.

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