NED Abstract 

Reproduced by permission

1999NewA....4..141G

       Radio halo and relic candidates from the NRAO VLA Sky Survey

                    G. Giovannini, M. Tordi, L. Feretti

              Received 13 January 1999: accepted 2 March 1999

Abstract
   We present the first results of the search of new halo and relic 
candidates in the NRAO VLA Sky Survey. We have inspected a sample of 205 
clusters from the X-ray-brightest Abell-type clusters presented by Ebeling 
et al. (1996), and found 29 candidates. Out of them, 11 clusters are 
already known from the literature to contain a diffuse cluster-wide source, 
while in 18 clusters this is the first indication of the existence of this 
type of sources. We classify these sources as halos or relics according to 
their location in the cluster center or periphery, respectively. We find 
that the occurrence of cluster halos and relics is higher in clusters with 
high X-ray luminosity and high temperature. We also confirm the correlation 
between the absence of a cooling flow and the presence of a radio halo at 
the cluster center.

Keywords: Galaxies: clusters: general: Intergalactic medium; Radio 
continuum: general; X-rays: general