Renewed activity in the radio galaxy PKS B1545-321: twin edge-brightened beams within diffuse radio lobes

Details Renewed activity in the radio galaxy PKS B1545-321: twin edge-brightened beams within diffuse radio lobes Renewed activity in the radio galaxy PKS B1545-321: twin edge-brightened beams within diffuse radio lobes

2003-03-07

arxiv.org/abs/astro-ph/0303157v1

Astrophys.J. 590 (2003) 181-191

Astronomy and Astrophysics

Astrophysics

30 pages, 12 figures, to appear in ApJ June, 2003

Scientific paper

10.1086/375004

Australia Telescope Compact Array (ATCA) images of the giant radio galaxy PKS B1545-321 show a pair of oppositely directed beams emerging from a radio core and ending in bright components that are symmetrically located on either side. These inner beams are embedded within edge-brightened outer lobes of lower surface brightness and the bright ends of the inner beams are well recessed from the ends of the outer lobes. The inner beams and diffuse surrounding lobes share a common central core and radio axis. We propose that the observed inner beams are double lobes which have been created within relic outer lobes as a consequence of a restarting of the central activity; therefore, PKS B1545-321 is a rare opportunity for examining the development of restarted beams within a relic synchrotron plasma cocoon. The inner double representing the new episode has among the highest axial ratios found in typical edge-brightened radio galaxies. The low radio luminosity of the inner double, the narrow and constant transverse extent of its cocoon and the relatively low brightness of the hotspots at its ends are consistent with the almost ballistic propagation expected for a beam that has a low density contrast and is advancing within a relatively light ambient medium.

Affiliated with

Also associated with

No associations

Rating

Renewed activity in the radio galaxy PKS B1545-321: twin edge-brightened beams within diffuse radio lobes 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 Renewed activity in the radio galaxy PKS B1545-321: twin edge-brightened beams within diffuse radio lobes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Renewed activity in the radio galaxy PKS B1545-321: twin edge-brightened beams within diffuse radio lobes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-441010