Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/27988
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Chhetri, R. | en_US |
dc.contributor.author | Morgan, J. | en_US |
dc.contributor.author | Ekers, R. D. | en_US |
dc.contributor.author | Macquart, J-P | en_US |
dc.contributor.author | Sadler, E. M. | en_US |
dc.contributor.author | GIROLETTI, MARCELLO | en_US |
dc.contributor.author | Callingham, J. R. | en_US |
dc.contributor.author | Tingay, S. J. | en_US |
dc.date.accessioned | 2020-10-26T09:23:33Z | - |
dc.date.available | 2020-10-26T09:23:33Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/27988 | - |
dc.description.abstract | We report the first astrophysical application of the technique of wide-field Interplanetary Scintillation (IPS) with the Murchison Widefield Array (MWA). This powerful technique allows us to identify and measure sub-arcsecond compact components in low-frequency radio sources across large areas of sky without the need for long-baseline interferometry or ionospheric calibration. We present the results of a five-minute observation of a 30x30 sq. deg MWA field at 162 MHz with 0.5 second time resolution. Of the 2550 continuum sources detected in this field, 302 (12 per cent) show rapid fluctuations caused by IPS. We find that at least 32% of bright low-frequency radio sources contain a sub-arcsec compact component that contributes over 40% of the total flux density. Perhaps surprisingly, peaked-spectrum radio sources are the dominant population among the strongly-scintillating, low-frequency sources in our sample. While gamma-ray AGN are generally compact, flat-spectrum radio sources at higher frequencies, the 162 MHz properties of many of the Fermi blazars in our field are consistent with a compact component embedded within more extended low-frequency emission. The detection of a known pulsar in our field shows that the wide-field IPS technique is at the threshold of sensitivity needed to detect new pulsars using image plane analysis, and scaling the current MWA sensitivity to that expected for SKA-low implies that large IPS-based pulsar searches will be feasible with SKA. Calibration strategies for the SKA require a better knowledge of the space density of compact sources at low radio frequencies, which IPS observations can now provide. | en_US |
dc.language.iso | eng | en_US |
dc.title | Interplanetary Scintillation studies with the Murchison Wide-field Array II: Properties of sub-arcsecond compact sources at low radio frequencies | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stx2864 | en_US |
dc.identifier.scopus | 2-s2.0-85045762483 | en_US |
dc.identifier.isi | 000424977800052 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/474/4/4937/4598011 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 474 | en_US |
dc.relation.issue | 4 | en_US |
dc.relation.firstpage | 4937 | en_US |
dc.relation.lastpage | 4955 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | 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 | en_US |
dc.identifier.adsbibcode | 2018MNRAS.474.4937C | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_6 Stars and stellar systems | 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.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.orcid | 0000-0002-8657-8852 | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
stx2864.pdf | PDF editoriale | 2.13 MB | Adobe PDF | View/Open |
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