Characterization of long baseline calibrators at 2.3 GHz

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dc.contributor.authorHungwe, F.
dc.contributor.authorOjha, R.
dc.contributor.authorBooth, R. S.
dc.contributor.authorBietenholz, M. F.
dc.contributor.authorCollioud, A.
dc.contributor.authorCharlot, P.
dc.contributor.authorBoboltz, D.
dc.contributor.authorFey, A. L.
dc.date.accessioned2020-03-30T14:19:43Z
dc.date.available2020-03-30T14:19:43Z
dc.date.issued2011-12-08
dc.description.abstractWe present a detailed multi-epoch analysis of 31 potential Southern hemisphere radio calibrators that were originally observed as part of a programme to maintain the International Celestial Reference Frame. At radio wavelengths, the primary calibrators are active galactic nuclei (AGNs), powerful radio emitters which exist at the centre of most galaxies. These are known to vary at all wavelengths at which they have been observed. By determining the amount of radio source structure and variability of these AGNs, we determine their suitability as phase calibrators for long baseline radio interferometry at 2.3 GHz. For this purpose, we have used a set of complementary metrics to classify these 31 southern sources into five categories pertaining to their suitability as very long baseline interferometry calibrators. We find that all of the sources in our sample would be good interferometric calibrators, and almost ninety per cent of them would be very good calibrators.en_US
dc.description.sponsorshipFH is supported by a grant from the South African SKA project and HartRAO. FH thanks the USNO for their hospitality during her visits in 2008 and 2010. This research has made use of the USNO RRFID and LAB BVID. This research has made use of NASA’s Astrophysics Data System Bibliographic Services and the NASA/IPAC Extragalactic Data base (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the NASA.en_US
dc.description.urihttps://academic.oup.com/mnras/article/418/4/2113/1023984en_US
dc.format.extent8 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2imqc-spr7
dc.identifier.citationF. Hungwe, R. Ojha, R. S. Booth, M. F. Bietenholz, A. Collioud, P. Charlot, D. Boboltz, A. L. Fey, Characterization of long baseline calibrators at 2.3 GHz, Monthly Notices of the Royal Astronomical Society, Volume 418, Issue 4, December 2011, Pages 2113–2120, https://doi.org/10.1111/j.1365-2966.2011.19232.xen_US
dc.identifier.urihttps://doi.org/10.1111/j.1365-2966.2011.19232.x
dc.identifier.urihttp://hdl.handle.net/11603/17760
dc.identifier.urihttp://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2011MNRAS.418.2113H
dc.language.isoen_USen_US
dc.publisherOxford University Pressen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleCharacterization of long baseline calibrators at 2.3 GHzen_US
dc.typeTexten_US

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