Multifrequency polarimetry of a complete sample of PACO radio sources
© 2016 The Authors. We present high-sensitivity polarimetric observations (s P ?0.6 mJy) in six bands covering the 5.5-38 GHz range of a complete sample of 53 compact extragalactic radio sources brighter than 200 mJy at 20 GHz. The observations, carried out with the Australia Telescope Compact Array...
| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Published: |
Oxford University Press
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/63108 http://dx.doi.org/10.1093/mnras/stw3017 |
| _version_ | 1848760996595761152 |
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| author | Galluzzi, V. Massardi, M. Bonaldi, A. Casasola, V. Gregorini, L. Trombetti, T. Burigana, C. De Zotti, G. Ricci, R. Stevens, J. Ekers, Ronald Bonavera, L. di Serego Alighieri, S. Liuzzo, E. López-Caniego, M. Mignano, A. Paladino, R. Toffolatti, L. Tucci, M. |
| author_facet | Galluzzi, V. Massardi, M. Bonaldi, A. Casasola, V. Gregorini, L. Trombetti, T. Burigana, C. De Zotti, G. Ricci, R. Stevens, J. Ekers, Ronald Bonavera, L. di Serego Alighieri, S. Liuzzo, E. López-Caniego, M. Mignano, A. Paladino, R. Toffolatti, L. Tucci, M. |
| author_sort | Galluzzi, V. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2016 The Authors. We present high-sensitivity polarimetric observations (s P ?0.6 mJy) in six bands covering the 5.5-38 GHz range of a complete sample of 53 compact extragalactic radio sources brighter than 200 mJy at 20 GHz. The observations, carried out with the Australia Telescope Compact Array, achieved a 91 per cent detection rate (at 5s). Within this frequency range, the spectra of about 95 per cent of sources are well fitted by double power laws, both in total intensity and in polarization, but the spectral shapes are generally different in the two cases. Most sources were classified as either steep- or peaked-spectrum but less than 50 per cent have the same classification in total and in polarized intensity. No significant trends of the polarization degree with flux density or with frequency were found. The mean variability index in total intensity of steep-spectrum sources increases with frequency for a 4-5 yr lag, while no significant trend shows up for the other sources and for the 8 yr lag. In polarization, the variability index, which could be computed only for the 8 yr lag, is substantially higher than in total intensity and has no significant frequency dependence. |
| first_indexed | 2025-11-14T10:24:39Z |
| format | Journal Article |
| id | curtin-20.500.11937-63108 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:24:39Z |
| publishDate | 2017 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-631082019-02-19T05:36:19Z Multifrequency polarimetry of a complete sample of PACO radio sources Galluzzi, V. Massardi, M. Bonaldi, A. Casasola, V. Gregorini, L. Trombetti, T. Burigana, C. De Zotti, G. Ricci, R. Stevens, J. Ekers, Ronald Bonavera, L. di Serego Alighieri, S. Liuzzo, E. López-Caniego, M. Mignano, A. Paladino, R. Toffolatti, L. Tucci, M. © 2016 The Authors. We present high-sensitivity polarimetric observations (s P ?0.6 mJy) in six bands covering the 5.5-38 GHz range of a complete sample of 53 compact extragalactic radio sources brighter than 200 mJy at 20 GHz. The observations, carried out with the Australia Telescope Compact Array, achieved a 91 per cent detection rate (at 5s). Within this frequency range, the spectra of about 95 per cent of sources are well fitted by double power laws, both in total intensity and in polarization, but the spectral shapes are generally different in the two cases. Most sources were classified as either steep- or peaked-spectrum but less than 50 per cent have the same classification in total and in polarized intensity. No significant trends of the polarization degree with flux density or with frequency were found. The mean variability index in total intensity of steep-spectrum sources increases with frequency for a 4-5 yr lag, while no significant trend shows up for the other sources and for the 8 yr lag. In polarization, the variability index, which could be computed only for the 8 yr lag, is substantially higher than in total intensity and has no significant frequency dependence. 2017 Journal Article http://hdl.handle.net/20.500.11937/63108 10.1093/mnras/stw3017 http://dx.doi.org/10.1093/mnras/stw3017 Oxford University Press restricted |
| spellingShingle | Galluzzi, V. Massardi, M. Bonaldi, A. Casasola, V. Gregorini, L. Trombetti, T. Burigana, C. De Zotti, G. Ricci, R. Stevens, J. Ekers, Ronald Bonavera, L. di Serego Alighieri, S. Liuzzo, E. López-Caniego, M. Mignano, A. Paladino, R. Toffolatti, L. Tucci, M. Multifrequency polarimetry of a complete sample of PACO radio sources |
| title | Multifrequency polarimetry of a complete sample of PACO radio sources |
| title_full | Multifrequency polarimetry of a complete sample of PACO radio sources |
| title_fullStr | Multifrequency polarimetry of a complete sample of PACO radio sources |
| title_full_unstemmed | Multifrequency polarimetry of a complete sample of PACO radio sources |
| title_short | Multifrequency polarimetry of a complete sample of PACO radio sources |
| title_sort | multifrequency polarimetry of a complete sample of paco radio sources |
| url | http://hdl.handle.net/20.500.11937/63108 http://dx.doi.org/10.1093/mnras/stw3017 |