Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-12
Astronomy and Astrophysics
Astrophysics
4 pages inc. 6 figures (2color). Accepted for publication in ApJL
Scientific paper
10.1086/529433
We show an interesting correlation between the surface brightness and temperature structure of the relaxed clusters RXJ1720.1+2638 and MS1455.0+2232, hosting a pair of cold fronts, and their central core--halo radio source. We discuss the possibility that the origin of this diffuse radio emission may be strictly connected with the gas sloshing mechanism suggested to explain the formation of cold fronts in non major merging clusters. We show that the radiative lifetime of the relativistic electrons is much shorter than the timescale on which they can be transported from the central galaxy up to the radius of the outermost cold front. This strongly indicates that the observed diffuse radio emission is likely produced by electrons re--accelerated via some kind of turbulence generated within the cluster volume limited by the cold fronts during the gas sloshing.
Giacintucci Simona
Mazzotta Pasquale
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