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Johnston, A.M.

doi:10.1016/j.tvjl.2007.03.013

Cited by 65 publications

(52 citation statements)

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“…This will enable coherent radio surveys that are well matched in terms of sensitivity and resolution to optical/near-IR data. Initial design study investment has been made in the DINGO project, which aims to conduct deep H I observations within a significant fraction of the GAMA regions using ASKAP (Johnston et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release

Driver¹,

Hill²,

Kelvin³

et al. 2011

Monthly Notices of the Royal Astronomical Society

986

847

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The definitive version can be found at: http://onlinelibrary.wiley.com/ Copyright Royal Astronomical SocietyThe Galaxy and Mass Assembly (GAMA) survey has been operating since 2008 February on the 3.9-m Anglo-Australian Telescope using the AAOmega fibre-fed spectrograph facility to acquire spectra with a resolution of R approximate to 1300 for 120 862 Sloan Digital Sky Survey selected galaxies. The target catalogue constitutes three contiguous equatorial regions centred at 9h (G09), 12h (G12) and 14.5h (G15) each of 12 x 4 deg2 to limiting fluxes of r(pet) < 19.4, r(pet) < 19.8 and r(pet) < 19.4 mag, respectively (and additional limits at other wavelengths). Spectra and reliable redshifts have been acquired for over 98 per cent of the galaxies within these limits. Here we present the survey footprint, progression, data reduction, redshifting, re-redshifting, an assessment of data quality after 3 yr, additional image analysis products (including ugrizYJHK photometry, Sersic profiles and photometric redshifts), observing mask and construction of our core survey catalogue (GamaCore). From this we create three science-ready catalogues: GamaCoreDR1 for public release, which includes data acquired during year 1 of operations within specified magnitude limits (2008 February to April); GamaCoreMainSurvey containing all data above our survey limits for use by the GAMA Team and collaborators; and GamaCoreAtlasSV containing year 1, 2 and 3 data matched to Herschel-ATLAS science demonstration data. These catalogues along with the associated spectra, stamps and profiles can be accessed via the GAMA website: http://www.gama-survey.org/

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Section: Introductionmentioning

confidence: 99%

Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release

Driver¹,

Hill²,

Kelvin³

et al. 2011

Monthly Notices of the Royal Astronomical Society

986

847

View full text Add to dashboard Cite

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“…The Australian Square Kilometre Array Pathfinder (ASKAP) is a new radio interferometer that will enable wide-field observations that can also resolve low-mass Hi clouds (Johnston et al 2007, Johnston et al 2008. ASKAP consists of 36 × 12-m antennas equipped with Phased Array Feeds (PAFs) that yield a 30 square degree field of view (DeBoer et al 2009).…”

mentioning

confidence: 99%

WALLABY Early Science – II. The NGC 7232 galaxy group

Lee-Waddell

Koribalski

Westmeier

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We report on neutral hydrogen (Hi) observations of the NGC 7232 group with the Australian Square Kilometre Array Pathfinder (ASKAP). These observations were conducted as part of the Wide-field ASKAP L-Band Legacy All-sky Blind surveY (WALLABY) Early Science program with an array of 12 ASKAP antennas equipped with Phased Array Feeds, which were used to form 36 beams to map a field of view of 30 square degrees. Analyzing a subregion of the central beams, we detect 17 Hi sources. Eleven of these detections are identified as galaxies and have stellar counterparts, of which five are newly resolved Hi galaxy sources. The other six detections appear to be tidal debris in the form of Hi clouds that are associated with the central triplet, NGC 7232/3, comprising the spiral galaxies NGC 7232, NGC 7232B and NGC 7233. One of these Hi clouds has a mass of M HI ∼ 3 × 10 8 M and could be the progenitor of a long-lived tidal dwarf galaxy. The remaining Hi clouds are likely transient tidal knots that are possibly part of a diffuse tidal bridge between NGC 7232/3 and another group member, the lenticular galaxy IC 5181.

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“…Not only may they be young AGN but they also have star formation occurring due to interactions and mergers (O'Dea 1998;Labiano et al 2008;Morganti et al 2009). In addition bright CSS sources are invaluable as flux calibrators for current and next-generation radio telescopes, such as the Australian Square Kilometre Array Pathfinder (ASKAP; Johnston et al 2007). Although CSS and GPS sources are relatively common in radio surveys of strong sources, there are few complete samples, making it difficult to characterize the statistical properties of the population as a whole.…”

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confidence: 99%

An unbiased sample of bright southern compact steep spectrum and gigahertz peaked spectrum sources

Randall¹,

Hopkins²,

Norris³

et al. 2011

Monthly Notices of the Royal Astronomical Society

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Compact Steep Spectrum (CSS) and Gigahertz Peaked Spectrum (GPS) sources are classes of compact, powerful, extragalactic objects. These sources are thought to be the earliest stages in the evolution of radio galaxies, capturing the ignition (or, in some cases, re‐ignition) of the active galactic nucleus. As well as serving as probes of the early stages of large‐scale radio sources, these sources are good, stable, amplitude calibrators for radio telescopes. We present an unbiased flux density limited (>1.5 Jy at 2.7 GHz) catalogue of these objects in the Southern hemisphere, including tabulated data, radio spectra, and where available, optical images and measurements. The catalogue contains 26 sources, consisting of two new candidates and 15 known CSS sources, and nine known GPS sources. We present new Australia Telescope Compact Array (ATCA) data on 10 of these 26 sources, and data on a further 42 sources which were excluded from our final sample. This bright sample will serve as a reference sample for comparison with subsequent faint (mJy level) samples of CSS and GPS candidates currently being compiled.

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Cited by 65 publications

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Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release

Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release

WALLABY Early Science – II. The NGC 7232 galaxy group

An unbiased sample of bright southern compact steep spectrum and gigahertz peaked spectrum sources

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