dc.contributor.author | Coppejans, Rocco | |
dc.contributor.author | Cseh, David | |
dc.contributor.author | Williams, Wendy L. | |
dc.contributor.author | Velzen, Sjoert van | |
dc.contributor.author | Falcke, Heino | |
dc.date.accessioned | 2017-07-13T17:00:44Z | |
dc.date.available | 2017-07-13T17:00:44Z | |
dc.date.issued | 2015-06-21 | |
dc.identifier.citation | Coppejans , 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.issn | 0035-8711 | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/1503.08865v1 | |
dc.identifier.other | ORCID: /0000-0001-7315-1596/work/42124902 | |
dc.identifier.uri | http://hdl.handle.net/2299/18921 | |
dc.description | This 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.abstract | We 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.extent | 10 | |
dc.format.extent | 1630114 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.subject | astro-ph.GA | |
dc.subject | astro-ph.CO | |
dc.title | Megahertz peaked-spectrum sources in the Boötes field I - a route towards finding high-redshift AGN? | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1093/mnras/stv681 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |