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Time-Dependent Radio Fine Structure of the Compact Sources NRAO 150 and 4C 39.25
Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.ORCID iD: 0000-0002-4826-019X
Massachusetts Institute of Technology, Cambridge, MA, USA.
Massachusetts Institute of Technology, Cambridge, MA, USA.
Massachusetts Institute of Technology, Cambridge, MA, USA.
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1980 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 86, no 3, 364-372 p.Article in journal (Refereed) Published
Abstract [en]

Very long baseline interferometer observations at 7.85 GHz have been used to probe the milliarcsecond structure of the unidentified, very compact radio source NRAO 150 and QSO 4 C 39.25. NRAO 150 exhibited no structural variations from 1972 to the end of 1974. A model with two circular Gaussian components fits the data well. NRAO 150 had a flux density of 7.6 plus or minus 0.5 Jy in the compact component; 4 C 39.25 showed a two-component structure, the components having a separation of (2.02 plus or minus 0.05 arc sec) x 10 to the -3rd power. The upper bound on the speed of transverse separation is 0.0001 arc sec per year or less than 2.7 c. From the spectrum there are also indications of a third, larger component.

Place, publisher, year, edition, pages
Les Ulis: EDP Sciences, 1980. Vol. 86, no 3, 364-372 p.
Keyword [en]
NRAO 150, 4C 39.25, compact radio sources, quasars, VLBI
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:hh:diva-22773OAI: oai:DiVA.org:hh-22773DiVA: diva2:629804
Available from: 2013-06-17 Created: 2013-06-17 Last updated: 2015-08-14Bibliographically approved

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