The Australia Telescope 20 GHz Survey: the source catalogue

By T. Murphy, E. Sadler, R. Ekers, M. Massardi, P. Hancock, E. Mahony, R. Ricci, S. Burke-Spolaor, M. Calabretta, R. Chhetri and 26 more. 2009

300 citations recorded by the source corpus.

We present the full source catalogue from the Australia Telescope 20 GHz (AT20G) Survey. The AT20G is a blind radio survey carried out at 20 GHz with the Australia Telescope Compact Array (ATCA) from 2004 to 2008, and covers the whole sky south of declination 0°. The AT20G source catalogue presented here is an order of magnitude larger than any previous catalogue of high-frequency radio sources, and includes 5890 sources above a 20 GHz flux-density limit of 40 mJy. All AT20G sources have total intensity and polarization measured at 20 GHz, and most sources south of declination −15° also have near-simultaneous flux-density measurements at 5 and 8 GHz. A total of 1559 sources were detected in polarized total intensity at one or more of the three frequencies. The completeness of the AT20G source catalogue is 91 per cent above 100 mJy beam−1 and 79 per cent above 50 mJy beam−1 in regions south of declination −15°. North of −15°, some observations of sources between 14 and 20 h in right ascension were lost due to bad weather and could not be repeated, so the catalogue completeness is lower in this region. Each detected source was visually inspected as part of our quality control process, and so the reliability of the final catalogue is essentially 100 per cent. We detect a small but significant population of non-thermal sources that are either undetected or have only weak detections in low-frequency catalogues. We introduce the term Ultra-Inverted Spectrum to describe these radio sources, which have a spectral index α(5, 20) > +0.7 and which constitute roughly 1.2 per cent of the AT20G sample. The 20 GHz flux densities measured for the strongest AT20G sources are in excellent agreement with the Wilkinson Microwave Anisotropy Probe (WMAP) 5-year source catalogue of Wright et al., and we find that the WMAP source catalogue is close to complete for sources stronger than 1.5 Jy at 23 GHz.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/de112fb6c69832c319a3f6cd612409c3427bc7f5

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Citations in the corpus

THE THIRD CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE (2015, methodology): “Tentative classifications: BCU—blazar candidates of uncertain type: these are considered candidate blazars because the association methods (see Sections 3.2.1 and 3.2.2) select a candidate counterpart that satisfies at least one of the following conditions: (a) a BZU object (blazar of uncertain/tran”
A MEASUREMENT OF THE COSMIC MICROWAVE BACKGROUND B-MODE POLARIZATION POWER SPECTRUM AT SUB-DEGREE SCALES WITH POLARBEAR (2014, methodology): “The pointing model is created by observing bright extended and point-like millimeter sources that were selected from known source catalogs (Wrobel et al. 1998; Murphy et al. 2010) to span a wide range in azimuth and elevation.”
EXTRAGALACTIC MILLIMETER-WAVE SOURCES IN SOUTH POLE TELESCOPE SURVEY DATA: SOURCE COUNTS, CATALOG, AND STATISTICS FOR AN 87 SQUARE-DEGREE FIELD (2009, methodology): “According to Murphy et al. (2010), the AT20G observations of sources between −60◦ and −50◦ decl. took place in 2005 September and October, so 1.5 cm-to-2.”
GALAXY CLUSTERS DISCOVERED VIA THE SUNYAEV–ZEL’DOVICH EFFECT IN THE FIRST 720 SQUARE DEGREES OF THE SOUTH POLE TELESCOPE SURVEY (2012, methodology): “The final pointing in the maps is checked against the positions of radio sources in the Australia Telescope 20 GHz survey (AT20G, Murphy et al. 2010), which has positional accuracy to better than 1 arcsec.”
Swift J1112.2−8238: a candidate relativistic tidal disruption flare (2015, background): “No catalogued source is consistent with the position of Swift J1112-8238 in either the SUMSS 843GHz survey (60% complete down to 6mJy, 100% to 8mJy, Bock, Large, & Sadler 1999; Mauch et al. 2003) or the AT20G 20GHz survey (91% complete to 100mJy, Murphy et al. 2010).”
THE ATACAMA COSMOLOGY TELESCOPE: SUNYAEV–ZEL'DOVICH-SELECTED GALAXY CLUSTERS AT 148 GHz IN THE 2008 SURVEY (2010, background): “The source is also identified at 0.84GHz in the Sydney University Molonglo Sky Survey (SUMSS) catalog (Mauch et al. 2003).”
Planck2015 results: XXVI. The SecondPlanckCatalogue of Compact Sources (2015, unknown): “For the search radius, we use 1.5 × σb, which includes ∼87% of the area of the Planck beam, as a compromise between the arcsecond resolution of CRATES and AT20G, and the ∼degree resolution of the 23 GHz WMAP channel.”
Complex Faraday depth structure of active galactic nuclei as revealed by broad‐band radio polarimetry (2012, background): “PKS B1903−802 is a flat-spectrum radio quasar which, from 1.4 to 20 GHz, maintains a total flux density of ∼1 Jy while remaining polarized at ∼3 per cent (Murphy et al. 2010).”
The Australia Telescope Compact Array Broadband Backend (CABB): Description & First Results ⋆ (2011, methodology): “Targets were selected from the RASS–6dFGS catalogue (Mahony et al. 2010a); a catalogue of 3405 AGN selected from the ROSAT ALL Sky Survey (RASS) Bright Source Catalogue (Voges et al. 1999) that were observed as part of the 6dF Galaxy Survey (6dFGS; Jones et al. 2009).”
ACTPol: a polarization-sensitive receiver for the Atacama Cosmology Telescope (2010, methodology): “Our top-level approach to reduce point-source contamination in ACTPol images is to clean the 150 GHz data by use of the 220 GHz data and surveys of radio sources conducted at lower frequencies (such as the 20 GHz survey of Murphy et al.55).”
GALAXY CLUSTERS SELECTED WITH THE SUNYAEV–ZEL'DOVICH EFFECT FROM 2008 SOUTH POLE TELESCOPE OBSERVATIONS (2010, methodology): “As in Vieira et al. (2010), a small pointing correction (∼5′′ on the sky) was applied, based on comparisons of radio source positions derived from SPT maps and positions of those sources in the AT20G catalog (Murphy et al. 2010).”
The Very Large Array Low-frequency Sky Survey Redux (VLSSr) (2014, background): “Existing radio surveys, including but not limited ⋆ E-mail: wendy.peters@nrl.navy.mil to the Australia Telescope 20 GHz Survey (AT20G: Murphy et al. 2010), the 5 GHz Parkes-MIT-NRAO survey (PMN: Griffith & Wright 1993), the 1400 MHz NRAO VLA Sky Survey (NVSS: Condon et al. 1998), the 843 MHz Sydney…”
The SPTpol Extended Cluster Survey (2019, background): “Sources detected in preliminary mapmaking runs at 5σ (∼9–15 mJy depending on field depth) at 150 GHz and bright radio sources detected in the Australia Telescope 20-GHz Survey (AT20G; Murphy et al. 2010) at the edges of the field are masked with a 4′ radius during these filtering steps.”
Planck2013 results. XXVIII. ThePlanckCatalogue of Compact Sources (2013, unknown): “…based on WMAP maps (López-Caniego et al. 2007; Massardi et al. 2009); (2) in the southern hemisphere, the Australia Telescope 20 GHz survey (AT20G; Murphy et al. 2010); (3) in the northern hemisphere, where no large-area survey at similar frequencies to AT20G is available, the 8.4 GHz Combined…”
The pre-launch Planck Sky Model: a model of sky emission at submillimetre to centimetre wavelengths (2012, background): “In the next release of the PSM this problem will be cured by taking into account the data from the AT20G survey (Hancock et al. 2011; Murphy et al. 2010), that allows a much better determination of the fluxdensity dependent distribution of spectral indices up to 20 GHz, as well as the high…”
CMB-S4 Science Case, Reference Design, and Project Plan (2019, methodology): “[49]), and will be a valuable tool for statistical studies of AGN populations ([446, 447, 448, 449, 450]).”
THE ATACAMA COSMOLOGY TELESCOPE: COSMOLOGY FROM GALAXY CLUSTERS DETECTED VIA THE SUNYAEV–ZEL'DOVICH EFFECT (2010, methodology): “Absolute pointing is determined by comparing the positions of ACT-observed radio sources with the positions of these same sources detected in the AT20G survey (Murphy et al. 2010).”