[10.10] Diffuse Radio Sources in Groups/Poor Clusters

AAS 206th Meeting, 29 May - 2 June 2005
Session 10 Galaxies, Clusters and Large Scale Structure
Poster, Monday, 9:20am-6:30pm, Tuesday, 10:00am-7:00pm, May 30, 2005, Ballroom A

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[10.10] Diffuse Radio Sources in Groups/Poor Clusters

K.M. Delain, L. Rudnick (U. Minnesota)

We present preliminary results of new diffuse radio sources without apparent AGN likely associated with groups of galaxies. We have discovered these sources through an unbiased search of the WENSS and WISH catalogs. Until now, this type of source was found exclusively in rich clusters of galaxies, probably due to selection effects. The radio halos and 'relics' of rich clusters are thought to be powered by shocks and turbulence from infall into their deep potential wells. Our detection of similar sources within the shallow potential wells of groups of galaxies challenges this model. Their radio luminosities are approximately two orders of magnitude higher than expected from the extrapolation of the apparent rich cluster radio/X-ray luminosity relation.

Partial support has been provided by NSF Grant AST-0307600 to the University of Minnesota.

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