Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21840826e&link_type=abstract
American Astronomical Society, AAS Meeting #218, #408.26; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We have performed a stacking experiment to detect faint, diffuse non-thermal radio emission in X-ray luminous (> 1044 erg s-1) galaxy clusters in the southern sky with z<0.2. The increased sensitivity of this experiment over existing pointed observations allows us to test models of cluster radio halo bimodality and models of relativistic particle acceleration. We stacked 111 cluster radio images and 111 control fields from the Sydney University Molonglo Sky Survey (SUMSS) at 843 MHz, after filtering out the contribution from compact sources. We tentatively detect diffuse emission from the stacked clusters, but this result may be contaminated by large-scale radio galaxies in the clusters. We therefore use the stacked emission to calculate an upper limit to the effective luminosity from the average halo of 3.2 x 1023 W/Hz at 1.4 GHz. We will present detections/upper limits separately for the subsets of relaxed and merging clusters and show how these can be used to constrain relativistic particle acceleration models. This work is supported in part by NSF grant AST 0908688 to the University of Minnesota.
Brown Shanique
Emerick Andrew
Rudnick Lawrence
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