Extreme Relic Radio Sources in Four Southern Clusters

H. Andernach, O.B. Slee, A.L. Roy, M. Ehle
2002 Symposium - International astronomical union  
We describe the highest-resolution radio observations yet made of relic radio sources. These relics have extremely steep (α ≤ −2.5) spectra and are located in four southern Abell clusters (A 13, A 85, A133, A 4038). VLA images at 1.4 GHz and ∼4″ resolution show a remarkable variety of fine structure like arcs, wisps, plumes, and loops. Integrated polarization fractions range from 2.3% to 16.8%. Deep red CCD images do not reveal any optical object with a brightness and/or position typical of a
more » ... dio host galaxy. The X-ray centroids in ROSAT images tend to be displaced from the cluster potential wells in the direction of the relics in A85, A133 and A4038, suggesting that some of the X-rays may be inverse Compton or excess thermal emission from the relic itself.
doi:10.1017/s0074180900168767 fatcat:dbm3rgv6lzcgpfxk3e3pwqjjlq