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

By N. Hurley-Walker, J. Callingham, Paul J. Hancock, T. Franzen, L. Hindson, A. Kapińska, J. Morgan, A. Offringa, Randall B. Wayth, Chen Wu and 33 more. 2016

388 citations recorded by the source corpus.

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 the Magellanic 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.

Subfields: Aerospace Engineering, Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/a60200b2705c68a8b5e27555c2fa470b1e057c61

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In Astronomy and Astrophysics

1. Hyesung Kang
2. M. Brüggen
3. R. Weeren
4. A. Stroe
5. F. Gasperin
6. F. Zandanel
7. Hiroki Akamatsu
8. D. Frail

In Nuclear and High Energy Physics

1. Hyesung Kang
2. M. Brüggen
3. R. Weeren
4. A. Stroe
5. F. Zandanel
6. F. Gasperin
7. Hiroki Akamatsu
8. D. Frail

Citations in the corpus

• The GMRT 150 MHz all-sky radio survey - First alternative data release TGSS ADR1 (2016, background): “…the Low Frequency Array (LOFAR) multi-frequency snapshot survey (MSSS; Heald et al. 2015) at 74 MHz and 151 MHz, and the Murchison Widefield Array (MWA) GaLactic and Extragalactic All-sky MWA survey (GLEAM; Wayth et al. 2015; Hurley-Walker et al. 2017) at five frequencies between 72 and 231 MHz.”
• Diffuse Radio Emission from Galaxy Clusters (2019, background): “More recently, halos have been uncovered with targeted GMRT campaigns5 (Venturi et al. 2008, 2007; Kale et al. 2013, 2015; Knowles et al. 2018), and via low-frequency surveys such as GLEAM6 (Wayth et al. 2015; Hurley-Walker et al. 2017) and LoTSS7 (Shimwell et al. 2017, 2018).”