Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....86..364b&link_type=abstract
Astronomy and Astrophysics, vol. 86, no. 3, June 1980, p. 364-372. Research supported by the Statens Naturvetenskapliga Forskni
Astronomy and Astrophysics
Astronomy
23
Fine Structure, Quasars, Radio Sources (Astronomy), Time Dependence, Very Long Base Interferometry, Astronomical Maps, Astronomical Models, Data Processing, Magnetic Flux, Normal Density Functions, Radiant Flux Density, Spectrum Analysis
Scientific paper
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.
Baath Lars B.
Clark Thomas A.
Cotton William D.
Counselman Charles C.
Hinteregger Hans F.
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