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Extreme Relic Radio Sources in Four Southern Clusters

Published online by Cambridge University Press:  26 May 2016

H. Andernach ,
O.B. Slee ,
A.L. Roy  and
M. Ehle
H. Andernach
Affiliation:
Depto. de Astronomía, Univ. de Guanajuato, Guanajuato, Mexico
O.B. Slee
Affiliation:
ATNF, CSIRO, PO Box 76, Epping, NSW 2121, Australia
A.L. Roy
Affiliation:
MPI für Radioastronomie, Auf dem Hügel 69, D—53121 Bonn, Germany
M. Ehle
Affiliation:
MPI für Extraterrestrische Physik, D—85748 Garching, Germany

Abstract

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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 radio 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.

Type
Part 3: Clusters of Galaxies
Information
Symposium - International Astronomical Union , Volume 199: The Universe at Low Radio Frequencies , 2002 , pp. 153 - 156
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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