Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/26320
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Franzen, T. M. O. | en_US |
dc.contributor.author | Jackson, C. A. | en_US |
dc.contributor.author | Offringa, A. R. | en_US |
dc.contributor.author | Ekers, R. D. | en_US |
dc.contributor.author | Wayth, R. B. | en_US |
dc.contributor.author | BERNARDI, GIANNI | en_US |
dc.contributor.author | Bowman, J. D. | en_US |
dc.contributor.author | Briggs, F. | en_US |
dc.contributor.author | Cappallo, R. J. | en_US |
dc.contributor.author | Deshpande, A. A. | en_US |
dc.contributor.author | Gaensler, B. M. | en_US |
dc.contributor.author | Greenhill, L. J. | en_US |
dc.contributor.author | Hazelton, B. J. | en_US |
dc.contributor.author | Johnston-Hollitt, M. | en_US |
dc.contributor.author | Kaplan, D. L. | en_US |
dc.contributor.author | Lonsdale, C. J. | en_US |
dc.contributor.author | McWhirter, S. R. | en_US |
dc.contributor.author | Mitchell, D. A. | en_US |
dc.contributor.author | Morales, M. F. | en_US |
dc.contributor.author | Morgan, E. | en_US |
dc.contributor.author | Morgan, J. | en_US |
dc.contributor.author | Oberoi, D. | en_US |
dc.contributor.author | Ord, S. M. | en_US |
dc.contributor.author | Prabu, T. | en_US |
dc.contributor.author | Seymour, N. | en_US |
dc.contributor.author | Shankar, N. Udaya | en_US |
dc.contributor.author | Srivani, K. S. | en_US |
dc.contributor.author | Subrahmanyan, R. | en_US |
dc.contributor.author | Tingay, S. J. | en_US |
dc.contributor.author | Trott, C. M. | en_US |
dc.contributor.author | Webster, R. L. | en_US |
dc.contributor.author | Williams, A. | en_US |
dc.contributor.author | Williams, C. L. | en_US |
dc.date.accessioned | 2020-07-03T10:36:39Z | - |
dc.date.available | 2020-07-03T10:36:39Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26320 | - |
dc.description.abstract | We 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 deg<SUP>2</SUP>, 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<SUP>-1</SUP>. 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<SUP>-1</SUP> level, due to incompletely peeled and out-of-image sources, and classical confusion becomes apparent at ≈1.7 mJy beam<SUP>-1</SUP>. 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.iso | eng | en_US |
dc.title | The 154 MHz radio sky observed by the Murchison Widefield Array: noise, confusion, and first source count analyses | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stw823 | en_US |
dc.identifier.scopus | 2-s2.0-84975060929 | en_US |
dc.identifier.isi | 000379840900078 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/459/3/3314/2595218 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 459 | en_US |
dc.relation.issue | 3 | en_US |
dc.relation.firstpage | 3314 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | USA | en_US |
dc.contributor.country | AUS | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2016MNRAS.459.3314F | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.orcid | 0000-0002-0916-7443 | - |
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