GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue
Using the Murchison Widefield Array (MWA), the low-frequency Square Kilometre Array precursor located in Western Australia, we have completed the GaLactic and Extragalactic All-sky MWA (GLEAM) survey, and present the resulting extragalactic catalogue, utilizing the first year of observations. The ca...
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| Format: | Journal Article |
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Oxford University Press
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/48964 |
| _version_ | 1848758134008446976 |
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| author | Hurley-Walker, Natasha Callingham, J. Hancock, Paul Franzen, Thomas Hindson, L. Kapinska, A. Morgan, J. Offringa, A. Wayth, Randall Wu, C. Zheng, Q. Murphy, T. Bell, M. Dwarakanath, K. For, B. Gaensler, B. Johnston-Hollitt, M. Lenc, E. Procopio, P. Staveley-Smith, L. Ekers, Ronald Bowman, J. Briggs, F. Cappallo, R. Deshpande, A. Greenhill, L. Hazelton, B. Kaplan, D. Lonsdale, C. McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Prabu, T. Udaya Shankar, N. Srivani, K. Subrahmanyan, R. Tingay, Steven Webster, R. Williams, A. Williams, C. |
| author_facet | Hurley-Walker, Natasha Callingham, J. Hancock, Paul Franzen, Thomas Hindson, L. Kapinska, A. Morgan, J. Offringa, A. Wayth, Randall Wu, C. Zheng, Q. Murphy, T. Bell, M. Dwarakanath, K. For, B. Gaensler, B. Johnston-Hollitt, M. Lenc, E. Procopio, P. Staveley-Smith, L. Ekers, Ronald Bowman, J. Briggs, F. Cappallo, R. Deshpande, A. Greenhill, L. Hazelton, B. Kaplan, D. Lonsdale, C. McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Prabu, T. Udaya Shankar, N. Srivani, K. Subrahmanyan, R. Tingay, Steven Webster, R. Williams, A. Williams, C. |
| author_sort | Hurley-Walker, Natasha |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Using the Murchison Widefield Array (MWA), the low-frequency Square Kilometre Array precursor located in Western Australia, we have completed the GaLactic and Extragalactic All-sky MWA (GLEAM) survey, and present the resulting extragalactic catalogue, utilizing the first year of observations. The catalogue covers 24 831 square degrees, over declinations south of +30° and Galactic latitudes outside 10° of the Galactic plane, excluding some areas such as theMagellanic Clouds. It contains 307 455 radio sources with 20 separate flux density measurements across 72-231 MHz, selected from a time- and frequency-integrated image centred at 200 MHz, with a resolution of ˜2 arcmin. Over the catalogued region, we estimate that the catalogue is 90 per cent complete at 170 mJy, and 50 per cent complete at 55 mJy, and large areas are complete at even lower flux density levels. Its reliability is 99.97 per cent above the detection threshold of 5s, which itself is typically 50 mJy. These observations constitute the widest fractional bandwidth and largest sky area survey at radio frequencies to date, and calibrate the low-frequency flux density scale of the southern sky to better than 10 per cent. This paper presents details of the flagging, imaging, mosaicking and source extraction/characterization, as well as estimates of the completeness and reliability. All source measurements and images are available online. 1 This is the first in a series of publications describing the GLEAM survey results. © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society |
| first_indexed | 2025-11-14T09:39:09Z |
| format | Journal Article |
| id | curtin-20.500.11937-48964 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:39:09Z |
| publishDate | 2017 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-489642018-03-15T03:22:11Z GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue Hurley-Walker, Natasha Callingham, J. Hancock, Paul Franzen, Thomas Hindson, L. Kapinska, A. Morgan, J. Offringa, A. Wayth, Randall Wu, C. Zheng, Q. Murphy, T. Bell, M. Dwarakanath, K. For, B. Gaensler, B. Johnston-Hollitt, M. Lenc, E. Procopio, P. Staveley-Smith, L. Ekers, Ronald Bowman, J. Briggs, F. Cappallo, R. Deshpande, A. Greenhill, L. Hazelton, B. Kaplan, D. Lonsdale, C. McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Prabu, T. Udaya Shankar, N. Srivani, K. Subrahmanyan, R. Tingay, Steven Webster, R. Williams, A. Williams, C. Using the Murchison Widefield Array (MWA), the low-frequency Square Kilometre Array precursor located in Western Australia, we have completed the GaLactic and Extragalactic All-sky MWA (GLEAM) survey, and present the resulting extragalactic catalogue, utilizing the first year of observations. The catalogue covers 24 831 square degrees, over declinations south of +30° and Galactic latitudes outside 10° of the Galactic plane, excluding some areas such as theMagellanic Clouds. It contains 307 455 radio sources with 20 separate flux density measurements across 72-231 MHz, selected from a time- and frequency-integrated image centred at 200 MHz, with a resolution of ˜2 arcmin. Over the catalogued region, we estimate that the catalogue is 90 per cent complete at 170 mJy, and 50 per cent complete at 55 mJy, and large areas are complete at even lower flux density levels. Its reliability is 99.97 per cent above the detection threshold of 5s, which itself is typically 50 mJy. These observations constitute the widest fractional bandwidth and largest sky area survey at radio frequencies to date, and calibrate the low-frequency flux density scale of the southern sky to better than 10 per cent. This paper presents details of the flagging, imaging, mosaicking and source extraction/characterization, as well as estimates of the completeness and reliability. All source measurements and images are available online. 1 This is the first in a series of publications describing the GLEAM survey results. © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society 2017 Journal Article http://hdl.handle.net/20.500.11937/48964 10.1093/mnras/stw2337 Oxford University Press fulltext |
| spellingShingle | Hurley-Walker, Natasha Callingham, J. Hancock, Paul Franzen, Thomas Hindson, L. Kapinska, A. Morgan, J. Offringa, A. Wayth, Randall Wu, C. Zheng, Q. Murphy, T. Bell, M. Dwarakanath, K. For, B. Gaensler, B. Johnston-Hollitt, M. Lenc, E. Procopio, P. Staveley-Smith, L. Ekers, Ronald Bowman, J. Briggs, F. Cappallo, R. Deshpande, A. Greenhill, L. Hazelton, B. Kaplan, D. Lonsdale, C. McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Prabu, T. Udaya Shankar, N. Srivani, K. Subrahmanyan, R. Tingay, Steven Webster, R. Williams, A. Williams, C. GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue |
| title | GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue |
| title_full | GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue |
| title_fullStr | GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue |
| title_full_unstemmed | GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue |
| title_short | GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue |
| title_sort | galactic and extragalactic all-sky murchison widefield array (gleam) survey - i. a low-frequency extragalactic catalogue |
| url | http://hdl.handle.net/20.500.11937/48964 |