Structure of the nucleus of 1928+738

Roland, J. and Britzen, S. and Kun, Emma and Henri, G. and Lambert, S. (2015) Structure of the nucleus of 1928+738. ASTRONOMY & ASTROPHYSICS, 578. pp. 86-103. ISSN 0004-6361

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Abstract

Modeling of the trajectories of VLBI components ejected by the nucleus of 1928+738 shows the VLBI jet contains three familiesof trajectories, i.e. VLBI components are ejected from three different origins. The fit of components C1, C6 and C8 indicates thatthe nucleus of 1928+738 contains two binary black hole systems. The first binary black hole system is associated with the stationarycomponents Cg and CS and is characterized by a radius Rbin,1 ≈ 0.220 mas; both black holes ejected VLBI components quasi regularlybetween 1990 and 2010. The second binary black hole system is not associated with stationary components and is characterized by aradius Rbin,2 ≈ 0.140 mas; it ejected only three VLBI components between 1994 and 1999. The two black hole sytems are separatedby ≈ 1.35 mas. We briefly discuss the consequences of the existence of binary black holes systems in radio quasars to make the linkbetween radio quasars and GAIA.

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