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RADIO RELICS IN CLUSTERS OF GALAXIES
GIOVANNINI GABRIELE,FERETTI LUIGINA The Korean Astronomical Society 2004 Journal of The Korean Astronomical Society Vol.37 No.5
In this paper we review the observational results on Relic radio sources in clusters of galaxies. We discuss their observational properties, structures and radio spectra. We will show that Relics can be divided according to their size, morphology, and location in the galaxy cluster. These differences could be related to physical properties of Relic sources. The comparison with cluster conditions suggests that Relics could be related to shock waves originated by cluster mergers.
PROPERTIES AND SPECTRAL BEHAVIOUR OF CLUSTER RADIO HALOS
L. FERETTI,G. BRUNETTI,G. GIOVANNINI,N. KASSIM,E. ORRU,G. SETTI 한국천문학회 2004 Journal of The Korean Astronomical Society Vol.37 No.5
Several arguments have been presented in the literature to support the connection between radiohalos and cluster mergers. The spectral index distributions of the halos in A665 and A2163 provide anew strong conrmation of this connection, i.e. of the fact that the cluster merger plays an importantrole in the energy supply to the radio halos. Features of the spectral index (attening and patches)are indication of a complex shape of the radiating electron spectrum, and are therefore in support ofelectron reacceleration models. Regions of atter spectrum are found to be related to the recent merger.In the undisturbed cluster regions, instead, the spectrum steepens with the distance from the clustercenter. The plot of the integrated spectral index of a sample of halos versus the cluster temperatureindicates that clusters at higher temperature tend to host halos with atter spectra. This correlationprovides further evidence of the connection between radio emission and cluster mergers.