Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..456m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. 456-464.
Astronomy and Astrophysics
Astrophysics
8
Astronomical Models, Centimeter Waves, Quasars, Radio Bursts, Very Long Base Interferometry, Brightness Temperature, Refractivity, Relativity, Temporal Distribution, Variability
Scientific paper
The authors have observed the quasar NRAO 140 using an eight station very long baseline array at 18 cm in 1984 April and a seven station array at 6 cm in 1984 May. They compare both the map and the data at 18 cm with those obtained by Marscher and Broderick in 1981 October. The latter coincided with a ≡25% outburst in flux density at wavelengths greater than ≡30 cm. The analysis indicates that a component ≡5 milli-arc seconds southeast of the "core" dropped significantly in brightness between 1981 October and 1984 April. The authors identify this component as the likely site of the low-frequency variations.
Bartel Norbert
Broderick John J.
Marscher Alan P.
Padrielli Lucia
Romney Jonathan D.
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