The POlarised GLEAM Survey (POGS) II: Results from an all-sky rotation measure synthesis survey at long wavelengths
The low-frequency linearly polarised radio source population is largely unexplored. However, a renaissance in low-frequency polarimetry has been enabled by pathfinder and precursor instruments for the Square Kilometre Array. In this second paper from the POlarised GaLactic and Extragalactic All-Sky...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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CAMBRIDGE UNIV PRESS
2020
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1017/pasa.2020.20 http://hdl.handle.net/20.500.11937/90882 |
| _version_ | 1848765450379329536 |
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| author | Riseley, C.J. Galvin, T.J. Sobey, Charlotte Vernstrom, T. White, Sarah V. Zhang, X. Gaensler, B.M. Heald, G. Anderson, C.S. Franzen, Thomas Hancock, Paul Hurley-Walker, Natasha Lenc, E. Van Eck, C.L. |
| author_facet | Riseley, C.J. Galvin, T.J. Sobey, Charlotte Vernstrom, T. White, Sarah V. Zhang, X. Gaensler, B.M. Heald, G. Anderson, C.S. Franzen, Thomas Hancock, Paul Hurley-Walker, Natasha Lenc, E. Van Eck, C.L. |
| author_sort | Riseley, C.J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The low-frequency linearly polarised radio source population is largely unexplored. However, a renaissance in low-frequency polarimetry has been enabled by pathfinder and precursor instruments for the Square Kilometre Array. In this second paper from the POlarised GaLactic and Extragalactic All-Sky MWA Survey-the POlarised GLEAM Survey, or POGS-we present the results from our all-sky MWA Phase I Faraday Rotation Measure survey. Our survey covers nearly the entire Southern sky in the Declination range to at a resolution between around three and seven arcminutes (depending on Declination) using data in the frequency range 169-231 MHz. We have performed two targeted searches: the first covering 25 489 square degrees of sky, searching for extragalactic polarised sources; the second covering the entire sky South of Declination, searching for known pulsars. We detect a total of 517 sources with 200 MHz linearly polarised flux densities between 9.9 mJy and 1.7 Jy, of which 33 are known radio pulsars. All sources in our catalogues have Faraday rotation measures in the range to rad m-2. The Faraday rotation measures are broadly consistent with results from higher-frequency surveys, but with typically more than an order of magnitude improvement in the precision, highlighting the power of low-frequency polarisation surveys to accurately study Galactic and extragalactic magnetic fields. We discuss the properties of our extragalactic and known-pulsar source population, how the sky distribution relates to Galactic features, and identify a handful of new pulsar candidates among our nominally extragalactic source population. |
| first_indexed | 2025-11-14T11:35:27Z |
| format | Journal Article |
| id | curtin-20.500.11937-90882 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:35:27Z |
| publishDate | 2020 |
| publisher | CAMBRIDGE UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-908822023-05-04T08:59:02Z The POlarised GLEAM Survey (POGS) II: Results from an all-sky rotation measure synthesis survey at long wavelengths Riseley, C.J. Galvin, T.J. Sobey, Charlotte Vernstrom, T. White, Sarah V. Zhang, X. Gaensler, B.M. Heald, G. Anderson, C.S. Franzen, Thomas Hancock, Paul Hurley-Walker, Natasha Lenc, E. Van Eck, C.L. Science & Technology Physical Sciences Astronomy & Astrophysics polarisation surveys radio continuum general galaxies active pulsars SPECTRO-POLARIMETRIC VIEW FARADAY-ROTATION MAGNETIC-FIELD MEASURE CATALOG RADIO-SOURCES ARRAY DEPOLARIZATION EVOLUTION PROFILES LATITUDE astro-ph.GA astro-ph.GA astro-ph.CO The low-frequency linearly polarised radio source population is largely unexplored. However, a renaissance in low-frequency polarimetry has been enabled by pathfinder and precursor instruments for the Square Kilometre Array. In this second paper from the POlarised GaLactic and Extragalactic All-Sky MWA Survey-the POlarised GLEAM Survey, or POGS-we present the results from our all-sky MWA Phase I Faraday Rotation Measure survey. Our survey covers nearly the entire Southern sky in the Declination range to at a resolution between around three and seven arcminutes (depending on Declination) using data in the frequency range 169-231 MHz. We have performed two targeted searches: the first covering 25 489 square degrees of sky, searching for extragalactic polarised sources; the second covering the entire sky South of Declination, searching for known pulsars. We detect a total of 517 sources with 200 MHz linearly polarised flux densities between 9.9 mJy and 1.7 Jy, of which 33 are known radio pulsars. All sources in our catalogues have Faraday rotation measures in the range to rad m-2. The Faraday rotation measures are broadly consistent with results from higher-frequency surveys, but with typically more than an order of magnitude improvement in the precision, highlighting the power of low-frequency polarisation surveys to accurately study Galactic and extragalactic magnetic fields. We discuss the properties of our extragalactic and known-pulsar source population, how the sky distribution relates to Galactic features, and identify a handful of new pulsar candidates among our nominally extragalactic source population. 2020 Journal Article http://hdl.handle.net/20.500.11937/90882 10.1017/pasa.2020.20 English http://dx.doi.org/10.1017/pasa.2020.20 http://purl.org/au-research/grants/arc/FT190100231 http://creativecommons.org/licenses/by/4.0/ CAMBRIDGE UNIV PRESS fulltext |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics polarisation surveys radio continuum general galaxies active pulsars SPECTRO-POLARIMETRIC VIEW FARADAY-ROTATION MAGNETIC-FIELD MEASURE CATALOG RADIO-SOURCES ARRAY DEPOLARIZATION EVOLUTION PROFILES LATITUDE astro-ph.GA astro-ph.GA astro-ph.CO Riseley, C.J. Galvin, T.J. Sobey, Charlotte Vernstrom, T. White, Sarah V. Zhang, X. Gaensler, B.M. Heald, G. Anderson, C.S. Franzen, Thomas Hancock, Paul Hurley-Walker, Natasha Lenc, E. Van Eck, C.L. The POlarised GLEAM Survey (POGS) II: Results from an all-sky rotation measure synthesis survey at long wavelengths |
| title | The POlarised GLEAM Survey (POGS) II: Results from an all-sky rotation measure synthesis survey at long wavelengths |
| title_full | The POlarised GLEAM Survey (POGS) II: Results from an all-sky rotation measure synthesis survey at long wavelengths |
| title_fullStr | The POlarised GLEAM Survey (POGS) II: Results from an all-sky rotation measure synthesis survey at long wavelengths |
| title_full_unstemmed | The POlarised GLEAM Survey (POGS) II: Results from an all-sky rotation measure synthesis survey at long wavelengths |
| title_short | The POlarised GLEAM Survey (POGS) II: Results from an all-sky rotation measure synthesis survey at long wavelengths |
| title_sort | polarised gleam survey (pogs) ii: results from an all-sky rotation measure synthesis survey at long wavelengths |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics polarisation surveys radio continuum general galaxies active pulsars SPECTRO-POLARIMETRIC VIEW FARADAY-ROTATION MAGNETIC-FIELD MEASURE CATALOG RADIO-SOURCES ARRAY DEPOLARIZATION EVOLUTION PROFILES LATITUDE astro-ph.GA astro-ph.GA astro-ph.CO |
| url | http://dx.doi.org/10.1017/pasa.2020.20 http://dx.doi.org/10.1017/pasa.2020.20 http://hdl.handle.net/20.500.11937/90882 |