TY - JOUR
T1 - GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey I
T2 - A low-frequency extragalactic catalogue
AU - Hurley-Walker, Natasha
AU - Callingham, Joseph R.
AU - Hancock, Paul J.
AU - Franzen, Thomas M. O.
AU - Hindson, Luke
AU - Kapinska, Anna D.
AU - Morgan, John
AU - Offringa, Andre R.
AU - Wayth, Randall B.
AU - Wu, Chen
AU - Zheng, Q.
AU - Murphy, Tara
AU - Bell, Martin E.
AU - Dwarakanath, K. S.
AU - For, Bi-Qing
AU - Gaensler, Bryan M.
AU - Johnston-Hollitt, Melanie
AU - Lenc, Emil
AU - Procopio, Pietro
AU - Staveley-Smith, Lister
AU - Ekers, Ron
AU - Bowman, Judd D.
AU - Briggs, Frank
AU - Cappallo, R. J.
AU - Deshpande, Avinash A.
AU - Greenhill, Lincoln
AU - Hazelton, Brynah J.
AU - Kaplan, David L.
AU - Lonsdale, Colin J.
AU - McWhirter, S. R.
AU - Mitchell, Daniel A.
AU - Morales, Miguel F.
AU - Morgan, Edward
AU - Oberoi, Divya
AU - Ord, Stephen M.
AU - Prabu, T.
AU - Shankar, N. Udaya
AU - Srivani, K. S.
AU - Subrahmanyan, Ravi
AU - Tingay, Steven J.
AU - Webster, Rachel L.
AU - Williams, Andrew
AU - Williams, Christopher L.
N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - Using the Murchison Widefield Array (MWA), the low-frequency Square Kilometre Array (SKA1 LOW) precursor located in Western Australia, we have completed the GaLactic and Extragalactic All-sky MWA (GLEAM) survey, and present the resulting extragalactic catalogue, utilising the first year of observations. The catalogue covers 24,831 square degrees, over declinations south of $+30^\circ$ and Galactic latitudes outside $10^\circ$ of the Galactic plane, excluding some areas such as the Magellanic Clouds. It contains 307,455 radio sources with 20 separate flux density measurements across 72--231MHz, selected from a time- and frequency- integrated image centred at 200MHz, with a resolution of $\approx 2$'. Over the catalogued region, we estimate that the catalogue is 90% complete at 170mJy, and 50% complete at 55mJy, and large areas are complete at even lower flux density levels. Its reliability is 99.97% above the detection threshold of $5\sigma$, which itself is typically 50mJy. 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%. This paper presents details of the flagging, imaging, mosaicking, and source extraction/characterisation, as well as estimates of the completeness and reliability. All source measurements and images are available online (http://www.mwatelescope.org/science/gleam-survey). 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 (SKA1 LOW) precursor located in Western Australia, we have completed the GaLactic and Extragalactic All-sky MWA (GLEAM) survey, and present the resulting extragalactic catalogue, utilising the first year of observations. The catalogue covers 24,831 square degrees, over declinations south of $+30^\circ$ and Galactic latitudes outside $10^\circ$ of the Galactic plane, excluding some areas such as the Magellanic Clouds. It contains 307,455 radio sources with 20 separate flux density measurements across 72--231MHz, selected from a time- and frequency- integrated image centred at 200MHz, with a resolution of $\approx 2$'. Over the catalogued region, we estimate that the catalogue is 90% complete at 170mJy, and 50% complete at 55mJy, and large areas are complete at even lower flux density levels. Its reliability is 99.97% above the detection threshold of $5\sigma$, which itself is typically 50mJy. 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%. This paper presents details of the flagging, imaging, mosaicking, and source extraction/characterisation, as well as estimates of the completeness and reliability. All source measurements and images are available online (http://www.mwatelescope.org/science/gleam-survey). This is the first in a series of publications describing the GLEAM survey results.
KW - techniques: interferometric
KW - galaxies: general
U2 - 10.1093/mnras/stw2337
DO - 10.1093/mnras/stw2337
M3 - Article
SN - 0035-8711
VL - 464
SP - 1146
EP - 1167
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -