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    Characterization of polarimetric and total intensity behaviour of a complete sample of PACO radio sources in the radio bands

    Access Status
    Fulltext not available
    Authors
    Galluzzi, V.
    Massardi, M.
    Bonaldi, A.
    Casasola, V.
    Gregorini, L.
    Trombetti, T.
    Burigana, C.
    Bonato, M.
    De Zotti, G.
    Ricci, R.
    Stevens, J.
    Ekers, Ronald
    Bonavera, L.
    di Serego Alighieri, S.
    Liuzzo, E.
    Lopez-Caniego, M.
    Paladino, R.
    Toffolatti, L.
    Tucci, M.
    Callingham, J.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Galluzzi, V. and Massardi, M. and Bonaldi, A. and Casasola, V. and Gregorini, L. and Trombetti, T. and Burigana, C. et al. 2018. Characterization of polarimetric and total intensity behaviour of a complete sample of PACO radio sources in the radio bands. Monthly Notices of the Royal Astronomical Society. 475 (1): pp. 1306-1322.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stx3216
    http://dx.doi.org/10.1093/mnras/stx3216
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Engineering)
    URI
    http://hdl.handle.net/20.500.11937/66424
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 The Author(s). We present high sensitivity (s P ~- 0.6mJy) polarimetric observations in seven bands, from 2.1 to 38 GHz, of a complete sample of 104 compact extragalactic radio sources brighter than 200 mJy at 20 GHz. Polarization measurements in six bands, in the range 5.5-38 GHz, for 53 of these objects were reported by Galluzzi et al. We have added new measurements in the same six bands for another 51 sources and measurements at 2.1 GHz for the full sample of 104 sources. Also, the previous measurements at 18, 24, 33, and 38 GHz were re-calibrated using the updated model for the flux density absolute calibrator, PKS1934-638, not available for the earlier analysis. The observations, carried out with the Australia Telescope Compact Array, achieved a 90 per cent detection rate (at 5s) in polarization. 89 of our sources have a counterpart in the 72-231MHz GLEAM (GaLactic and Extragalactic All-sky MurchisonWidefield Array) survey, providing an unparalleled spectral coverage of 2.7 decades of frequency for these sources. While the total intensity data from 5.5 to 38 GHz could be interpreted in terms of single component emission, a joint analysis of more extended total intensity spectra presented here, and of the polarization spectra, reveals that over 90 per cent of our sources show clear indications of at least two emission components. We interpret this as an evidence of recurrent activity. Our high sensitivity polarimetry has allowed a 5s detection of the weak circular polarization for ~38 per cent of the data set, and a deeper estimate of 20 GHz polarization source counts than has been possible so far.

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