Very-Long-Baseline Radio Interferometry (VLBI) Observations of γ-Ray Blazars: Results from Millimeter-VLBI Observations

Details Very-Long-Baseline Radio Interferometry (VLBI) Observations of γ-Ray Blazars: Results from Millimeter-VLBI Observations Very-Long-Baseline Radio Interferometry (VLBI) Observations of γ-Ray Blazars: Results from Millimeter-VLBI Observations

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pnas...9211377k&link_type=abstract

Proceedings of the National Academy of Sciences of the United States of America, Volume 92, Issue 25, pp. 11377-11380

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25

Scientific paper

VLBI observations of the extremely γ-bright blazar PKS 0528+134 at 8, 22, 43, and 86 GHz reveal a strongly bent one-sided-core jet structure with at least three moving and two apparently stationary jet components. At the highest observing frequencies the brightest and most compact jet component (the VLBI core) is unresolved with an upper limit to its size of ≈50 microarcsec corresponding to ≈0.2 parsec [H_0 = 100 km.s-1.Mpc-1 (megaparsec-1), q_0 = 0.5, where H_0 is Hubble constant and q_0 is the deceleration parameter]. Two 86-GHz VLBI observations performed in 1993.3 and 1994.0 reveal a new jet component emerging with superluminal speed from the core. Linear back-extrapolation of its motion yields strong evidence that the ejection of this component is related to an outburst in the millimeter regime and a preceding intense flare of the γ-flux density observed in early 1993. This and the radio/optical "light curves" and VLBI data for two other sources (S5 0836+710 and 3C 454.3) suggest that the observed γ-radiation might be Doppler-boosted and perhaps is closely related to the physical processes acting near the "base" of the highly relativistic jets observed in quasars.

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