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Proper motion in Cygnus A | U. Bach
; T.P. Krichbaum
; W. Alef
; A. Witzel
; J.A. Zensus
; | Date: |
3 Jul 2002 | Subject: | astro-ph | Affiliation: | MPIfR | Abstract: | Our 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 | Services: | Forum | Review | PDF | Favorites |
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