GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue

N. Hurley-Walker, J. R. Callingham, P. J. Hancock, T. M O Franzen, L. Hindson, A. D. Kapińska, J. Morgan, A. R. Offringa, R. B. Wayth, C. Wu, Q. Zheng, T. Murphy, M. E. Bell, K. S. Dwarakanath, B. For, B. M. Gaensler, M. Johnston-Hollitt, E. Lenc, P. Procopio, L. Staveley-Smith & 23 others R. Ekers, Judd Bowman, F. Briggs, R. J. Cappallo, A. A. Deshpande, L. Greenhill, B. J. Hazelton, D. L. Kaplan, C. J. Lonsdale, S. R. McWhirter, D. A. Mitchell, M. F. Morales, E. Morgan, D. Oberoi, S. M. Ord, T. Prabu, N. Udaya Shankar, K. S. Srivani, R. Subrahmanyan, S. J. Tingay, R. L. Webster, A. Williams, C. L. Williams

Research output: Contribution to journalArticle

116 Citations (Scopus)

Abstract

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 5σ, 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.

Original languageEnglish (US)
Pages (from-to)1146-1167
Number of pages22
JournalMonthly Notices of the Royal Astronomical Society
Volume464
Issue number1
DOIs
StatePublished - 2017

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catalogs
sky
low frequencies
flux density
Southern sky
radio
declination
completeness
estimates
radio frequencies
bandwidth
thresholds

Keywords

  • Galaxies: general
  • Surveys
  • Techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Hurley-Walker, N., Callingham, J. R., Hancock, P. J., Franzen, T. M. O., Hindson, L., Kapińska, A. D., ... Williams, C. L. (2017). GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue. Monthly Notices of the Royal Astronomical Society, 464(1), 1146-1167. https://doi.org/10.1093/mnras/stw2337

GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue. / Hurley-Walker, N.; Callingham, J. R.; Hancock, P. J.; Franzen, T. M O; Hindson, L.; Kapińska, A. D.; Morgan, J.; Offringa, A. R.; Wayth, R. B.; Wu, C.; Zheng, Q.; Murphy, T.; Bell, M. E.; Dwarakanath, K. S.; For, B.; Gaensler, B. M.; Johnston-Hollitt, M.; Lenc, E.; Procopio, P.; Staveley-Smith, L.; Ekers, R.; Bowman, Judd; Briggs, F.; Cappallo, R. J.; Deshpande, A. A.; Greenhill, L.; Hazelton, B. J.; Kaplan, D. L.; Lonsdale, C. J.; McWhirter, S. R.; Mitchell, D. A.; Morales, M. F.; Morgan, E.; Oberoi, D.; Ord, S. M.; Prabu, T.; Udaya Shankar, N.; Srivani, K. S.; Subrahmanyan, R.; Tingay, S. J.; Webster, R. L.; Williams, A.; Williams, C. L.

In: Monthly Notices of the Royal Astronomical Society, Vol. 464, No. 1, 2017, p. 1146-1167.

Research output: Contribution to journalArticle

Hurley-Walker, N, Callingham, JR, Hancock, PJ, Franzen, TMO, Hindson, L, Kapińska, AD, Morgan, J, Offringa, AR, Wayth, RB, Wu, C, Zheng, Q, Murphy, T, Bell, ME, Dwarakanath, KS, For, B, Gaensler, BM, Johnston-Hollitt, M, Lenc, E, Procopio, P, Staveley-Smith, L, Ekers, R, Bowman, J, Briggs, F, Cappallo, RJ, Deshpande, AA, Greenhill, L, Hazelton, BJ, Kaplan, DL, Lonsdale, CJ, McWhirter, SR, Mitchell, DA, Morales, MF, Morgan, E, Oberoi, D, Ord, SM, Prabu, T, Udaya Shankar, N, Srivani, KS, Subrahmanyan, R, Tingay, SJ, Webster, RL, Williams, A & Williams, CL 2017, 'GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue', Monthly Notices of the Royal Astronomical Society, vol. 464, no. 1, pp. 1146-1167. https://doi.org/10.1093/mnras/stw2337
Hurley-Walker, N. ; Callingham, J. R. ; Hancock, P. J. ; Franzen, T. M O ; Hindson, L. ; Kapińska, A. D. ; Morgan, J. ; Offringa, A. R. ; Wayth, R. B. ; Wu, C. ; Zheng, Q. ; Murphy, T. ; Bell, M. E. ; Dwarakanath, K. S. ; For, B. ; Gaensler, B. M. ; Johnston-Hollitt, M. ; Lenc, E. ; Procopio, P. ; Staveley-Smith, L. ; Ekers, R. ; Bowman, Judd ; Briggs, F. ; Cappallo, R. J. ; Deshpande, A. A. ; Greenhill, L. ; Hazelton, B. J. ; Kaplan, D. L. ; Lonsdale, C. J. ; McWhirter, S. R. ; Mitchell, D. A. ; Morales, M. F. ; Morgan, E. ; Oberoi, D. ; Ord, S. M. ; Prabu, T. ; Udaya Shankar, N. ; Srivani, K. S. ; Subrahmanyan, R. ; Tingay, S. J. ; Webster, R. L. ; Williams, A. ; Williams, C. L. / GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 464, No. 1. pp. 1146-1167.
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T1 - GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue

AU - Hurley-Walker, N.

AU - Callingham, J. R.

AU - Hancock, P. J.

AU - Franzen, T. M O

AU - Hindson, L.

AU - Kapińska, A. D.

AU - Morgan, J.

AU - Offringa, A. R.

AU - Wayth, R. B.

AU - Wu, C.

AU - Zheng, Q.

AU - Murphy, T.

AU - Bell, M. E.

AU - Dwarakanath, K. S.

AU - For, B.

AU - Gaensler, B. M.

AU - Johnston-Hollitt, M.

AU - Lenc, E.

AU - Procopio, P.

AU - Staveley-Smith, L.

AU - Ekers, R.

AU - Bowman, Judd

AU - Briggs, F.

AU - Cappallo, R. J.

AU - Deshpande, A. A.

AU - Greenhill, L.

AU - Hazelton, B. J.

AU - Kaplan, D. L.

AU - Lonsdale, C. J.

AU - McWhirter, S. R.

AU - Mitchell, D. A.

AU - Morales, M. F.

AU - Morgan, E.

AU - Oberoi, D.

AU - Ord, S. M.

AU - Prabu, T.

AU - Udaya Shankar, N.

AU - Srivani, K. S.

AU - Subrahmanyan, R.

AU - Tingay, S. J.

AU - Webster, R. L.

AU - Williams, A.

AU - Williams, C. L.

PY - 2017

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N2 - 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 5σ, 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.

AB - 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 5σ, 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.

KW - Galaxies: general

KW - Surveys

KW - Techniques: interferometric

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