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  • 1
    Language: English
    In: Publications of the Astronomical Society of Australia, 2014, Vol.31
    Description: We present the results of an approximately 6,100 square degree 104--196MHz radio sky survey performed with the Murchison Widefield Array during instrument commissioning between 2012 September and 2012 December: the Murchison Widefield Array Commissioning Survey (MWACS). The data were taken as meridian drift scans with two different 32-antenna sub-arrays that were available during the commissioning period. The survey covers approximately 20.5 h 〈 Right Ascension (RA) 〈 8.5 h, -58 deg 〈 Declination (Dec) 〈 -14 deg over three frequency bands centred on 119, 150 and 180 MHz, with image resolutions of 6--3 arcmin. The catalogue has 3-arcmin angular resolution and a typical noise level of 40 mJy/beam, with reduced sensitivity near the field boundaries and bright sources. We describe the data reduction strategy, based upon mosaiced snapshots, flux density calibration and source-finding method. We present a catalogue of flux density and spectral index measurements for 14,110 sources, extracted from the mosaic, 1,247 of which are sub-components of complexes of sources. Comment: 22 pages, 18 figures, accepted to PASA
    Keywords: Astrophysics - Instrumentation And Methods For Astrophysics;
    ISSN: 1323-3580
    E-ISSN: 1448-6083
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  • 2
    Language: English
    In: Publications of the Astronomical Society of Australia, 2013, Vol.30
    Description: Significant new opportunities for astrophysics and cosmology have been identified at low radio frequencies. The Murchison Widefield Array is the first telescope in the Southern Hemisphere designed specifically to explore the low-frequency astronomical sky between 80 and 300 MHz with arcminute angular resolution and high survey efficiency. The telescope will enable new advances along four key science themes, including searching for redshifted 21 cm emission from the epoch of reionisation in the early Universe; Galactic and extragalactic all-sky southern hemisphere surveys; time-domain astrophysics; and solar, heliospheric, and ionospheric science and space weather. The Murchison Widefield Array is located in Western Australia at the site of the planned Square Kilometre Array (SKA) low-band telescope and is the only low-frequency SKA precursor facility. In this paper, we review the performance properties of the Murchison Widefield Array and describe its primary scientific objectives. Comment: Updated with revisions. 32 pages including figures and references. Submitted to PASA
    Keywords: Astrophysics - Instrumentation And Methods For Astrophysics ; Astrophysics - Cosmology And Nongalactic Astrophysics ; Astrophysics - Astrophysics Of Galaxies ; Astrophysics - Solar And Stellar Astrophysics;
    ISSN: 1323-3580
    E-ISSN: 1448-6083
    Library Location Call Number Volume/Issue/Year Availability
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