Milli-arcsec structure of 3C 345

Astronomy and Astrophysics – Astrophysics

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Astronomical Models, Galactic Structure, Quasars, Variability, Very Long Base Interferometry, Angular Resolution, Computer Techniques, Data Reduction, Mapping, Visibility

Scientific paper

The quasar 3C 345 has been studied at eight epochs between 1977.56 and 1979.92 using very-long-baseline interferometry, alternating between frequencies of 10.65 and 5.01 GHz. Hybrid maps for each epoch show that the source comprises a bright, barely-resolved 'core' with an inverted spectrum, and an elongated region of emission extending approximately 5 milliarcsec from its western side. The position angle of this 'jet' changes systematically from P.A. approximately -85 deg close to the core to P.A. approximately -75 deg at a radius of 3 milliarcsec. Components within this 'jet' change in position and brightness with time, but they do not show clear indications of superluminal expansion. No emission is found on the eastern side of the core above a level of 5% of the peak brightness.

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