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Dr Melanie Johnston-Hollitt (University of Tasmania)

Conditions required to generate double radio relic clusters; a detailed study of A3376 - Dr Melanie Johnston-Hollitt Colloquium

The Australia Telescope National Facility Colloquium
15:30-16:30 Wed 09 Nov 2005

ATNF Marsfield Lecture Theatre


About 30% of massive clusters at low redshift exhibit diffuse radio
emission. Most of them are associated with a cluster-cluster merger event
known from the X-rays and while the number of known sources with at least
one of the so-called "radio relics" has dramatically increased within the
last decade due to improved instrument sensitivity, only two clusters are
known to have two giant radio relics located on their periphery. These
systems, like the famous A3667, exhibit conditions which allow two such
relics to be generated, but how are these cluster different to those that
only exhibit a single relic? Are the mechanisms of generation different?
Until now A3667 has been the only well studied example of such a "double
relic" system. We have obtained a large multi-wavelength dataset
for the A3667-like cluster A3376 which has provided an unprecedented
dataset for this cluster and allowed a detailed study of its dynamical
We will compare A3376 to the famous case of A3667 and discuss on what
makes "double-relic" clusters special.

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Roopesh Ojha

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