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dc.contributor.authorCoppejans, Rocco
dc.contributor.authorCseh, David
dc.contributor.authorWilliams, Wendy L.
dc.contributor.authorVelzen, Sjoert van
dc.contributor.authorFalcke, Heino
dc.date.accessioned2017-07-13T17:00:44Z
dc.date.available2017-07-13T17:00:44Z
dc.date.issued2015-06-21
dc.identifier.citationCoppejans , R , Cseh , D , Williams , W L , Velzen , S V & Falcke , H 2015 , ' Megahertz peaked-spectrum sources in the Boötes field I - a route towards finding high-redshift AGN? ' , Monthly Notices of the Royal Astronomical Society , vol. 450 , no. 2 , pp. 1477-1485 . https://doi.org/10.1093/mnras/stv681
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 10297420
dc.identifier.otherPURE UUID: 0644361d-059c-4872-bb4a-1d3f9fac9059
dc.identifier.otherArXiv: http://arxiv.org/abs/1503.08865v1
dc.identifier.otherScopus: 84938099094
dc.identifier.urihttp://hdl.handle.net/2299/18921
dc.descriptionThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
dc.description.abstractWe present a 324.5MHz image of the NOAO Bo\"otes field that was made using Very Large Array (VLA) P-band observations. The image has a resolution of 5.6x5.1arcsec, a radius of $2.05^\circ$ and a central noise of ~0.2mJy\beam. Both the resolution and noise of the image are an order of magnitude better than what was previously available at this frequency and will serve as a valuable addition to the already extensive multiwavelength data that are available for this field. The final source catalogue contains 1370 sources and has a median 325 to 1400MHz spectral index of -0.72. Using a radio colour-colour diagram of the unresolved sources in our catalogue, we identify 33 megahertz peaked-spectrum (MPS) sources. Based on the turnover frequency linear size relation for the gigahertz peaked-spectrum (GPS) and compact steep-spectrum (CSS) sources, we expect that the MPS sources that are compact on scales of tens of milliarcseconds should be young radio loud active galactic nuclei at high (z>2) redshifts. Of the 33 MPS sources, we were able to determine redshifts for 24, with an average redshift of 1.3. Given that five of the sources are at z>2, that the four faint sources for which we could not find redshifts are likely at even higher redshifts and that we could only select sources that are compact on a scale of ~5arcsec, there is encouraging evidence that the MPS method can be used to search for high-redshift sources.en
dc.format.extent10
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.subjectastro-ph.GA
dc.subjectastro-ph.CO
dc.titleMegahertz peaked-spectrum sources in the Boötes field I - a route towards finding high-redshift AGN?en
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2015-06-21
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stv681
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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