Proper motion in Cygnus A

Details Proper motion in Cygnus A Proper motion in Cygnus A

2002-07-03

arxiv.org/abs/astro-ph/0207082v1

Astronomy and Astrophysics

Astrophysics

4 pages, 6 figures, appears in: Proceedings of the 6th European VLBI Network Symposium held on June 25th-28th in Bonn, Germany

Scientific paper

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 $\beta_{\rm app}\approx 0.1-0.2$ (Krichbaum et al. 1998) at core-separations near 1 mas to $\beta_{\rm app}\approx 0.4-0.6$ 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 $\beta_{\rm app}=0.35\pm0.2$ 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).

Affiliated with

Also associated with

No associations

Rating

Proper motion in Cygnus A does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Proper motion in Cygnus A, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Proper motion in Cygnus A will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-525859