Title: Cygnus A revisited: precessing jets,  multiple jet activity periods and hotspot shockfronts
Katrien Steenbrugge (Universidad Católica del Norte)

Abstract:
I will present the results from a study combining radio and X-ray images of the nearby powerful radio galaxy Cygnus A. I will show that the jets are precessing, giving us a best-fit jet speed of only 0.35 c. In the X-ray and low frequency radio images emission from a previous episode of jet activity is detected in the eastern lobe. From these observations we determine that the last episode of jet activity ended about a million years before the current episode of jet activity started. I will show that the proper motion of the host galaxy results in the fact that the jets are not co-aligned and the nucleus is located in or in front of  the eastern lobe. Finally I will present some preliminary results on our study of the hotspots, showing that the younger hotspot shifts in position with observed frequency, and that both hotspots are powered by linear shockfronts.