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28 March 2024
 
  » arxiv » astro-ph/0207082

 Article overview


Proper motion in Cygnus A
U. Bach ; T.P. Krichbaum ; W. Alef ; A. Witzel ; J.A. Zensus ;
Date 3 Jul 2002
Subject astro-ph
AffiliationMPIfR
AbstractOur recent VLBI observations of the prominent FR II radio galaxy Cygnus A with the EVN and the VLBA reveal a pronounced two-sided jet structure. At 5 GHz, we now have 4 epochs from 1986, 1991 (Carilli et al., 1991 & 1994), 1996 and 2002 from which we could derive the kinematics of the jet and counter-jet. On the jet side and on mas scales, the jet seems to accelerate from $eta_{ m app}approx 0.1-0.2$ (Krichbaum et al. 1998) at core-separations near 1 mas to $eta_{ m app}approx 0.4-0.6$ at $r geq 4$ mas ($H_0=100$ km s$^{-1}$ Mpc$^{-1}$, $q_0=0.5$). For the first time we also measure significant structural variability on the counter-jet side. For this, we derive a motion of $eta_{ m app}=0.35pm0.2$ at $r=9.5$ mas. The flat spectrum of the inner region of the counter-jet (free-free absorption) and the frequency dependence of the jet to counter-jet ratio support strong evidence for an obscuring torus in front of the counter-jet (Bach et al. in prep, Krichbaum et al. 1998).
Source arXiv, astro-ph/0207082
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