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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6746
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dc.contributor.authorFranzen, Thomas M.O.-
dc.contributor.authorJackson, C.A-
dc.contributor.authorDeshpande, A.A.-
dc.contributor.authorPrabu, T.-
dc.contributor.authorUdaya Shankar, N.-
dc.contributor.authorSrivani, K.S.-
dc.contributor.authorSubrahmanyan, Ravi-
dc.contributor.author+ 23 Co-authors-
dc.date.accessioned2017-09-26T11:07:24Z-
dc.date.available2017-09-26T11:07:24Z-
dc.date.issued2016-07-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2016, Vol. 459, p3314-3325en_US
dc.identifier.issn0035-8711-
dc.identifier.issn1365-2966 - (online)-
dc.identifier.urihttp://hdl.handle.net/2289/6746-
dc.descriptionOpen Accessen_US
dc.description.abstractWe analyse a 154 MHz image made from a 12 h observation with the Murchison Widefield Array (MWA) to determine the noise contribution and behaviour of the source counts down to 30 mJy. The MWA image has a bandwidth of 30.72 MHz, a field-of-view within the half-power contour of the primary beam of 570 deg2, a resolution of 2.3 arcmin and contains 13 458 sources above 5σ. The rms noise in the centre of the image is 4–5 mJy beam−1. The MWA counts are in excellent agreement with counts from other instruments and are the most precise ever derived in the flux density range 30–200 mJy due to the sky area covered. Using the deepest available source count data, we find that the MWA image is affected by sidelobe confusion noise at the ≈3.5 mJy beam−1 level, due to incompletely peeled and out-of-image sources, and classical confusion becomes apparent at ≈1.7 mJy beam−1. This work highlights that (i) further improvements in ionospheric calibration and deconvolution imaging techniques would be required to probe to the classical confusion limit and (ii) the shape of low-frequency source counts, including any flattening towards lower flux densities, must be determined from deeper ≈150 MHz surveys as it cannot be directly inferred from higher frequency data.en_US
dc.language.isoenen_US
dc.publisherOxford University Press for the Royal Astronomical Societyen_US
dc.relation.urihttp://adsabs.harvard.edu/abs/2016MNRAS.459.3314Fen_US
dc.relation.urihttp://arxiv.org/abs/1604.03751en_US
dc.relation.urihttp://dx.doi.org/10.1093/mnras/stw823en_US
dc.rights2016 The authors & the Royal Astronomical Societyen_US
dc.subjectactive radio continuumen_US
dc.titleThe 154 MHz radio sky observed by the Murchison Widefield Array: noise, confusion, and first source count analysesen_US
dc.typeArticleen_US
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