Abell 2061 (Figure 14). The bright relic to the SW of the X-ray cluster emission
was found by Kempner & Sarazin (2001). Here, we show that there is additional
diffuse radio emission coincident with the X-ray emission. Both the X-ray and
the diffuse radio emission extend to the NE, in the direction of A2067. This
system has been imaged using BeppoSAX MECS by Marini et al. (2004), who describe
this extension as the "plume" and cite evidence for a shock within A2061 that
may be caused by an infalling group. Rines & Diaferio (2006) note that with a
separation of order Mpc in the sky, and a separation of only ~600 km s^-1^
in redshift, Abell clusters 2061 and 2067 are probably bound. They are part of
the Cor Bor supercluster (Small et al. 1998).
A2061. - The diffuse emission in this cluster is visible as two closely
separated sources ~18' southwest of the cluster center. The two regions are
most likely part of a single radio relic. The FIRST survey shows two point
sources: one just south of the relic, the other just north. This second
source is too faint to be clearly visible in the WENSS but is obvious in
As the cluster's RS type indicates, it is quite elongated, with the
position angle of the galaxy distribution extending in the direction of the
relic. The X-ray gas also has a bimodal distribution (Crawford et al.
1999). The RASS image shows that this extension has the same orientation as
that of the optical galaxy distribution.
This bimodal cluster is highly extended. We have observed the two
equally bright dominant galaxies either side of the X-ray centroid.