A giant radio halo in the massive and merging cluster Abell 1351 - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: We report on the detection of diffuse radio emission in the X-ray luminousand massive galaxy cluster A1351 z=0.322 using archival Very Large Array dataat 1.4 GHz. Given its central location, morphology, and Mpc-scale extent, weclassify the diffuse source as a giant radio halo. X-ray and weak lensingstudies show A1351 to be a system undergoing a major merger. The halo isassociated with the most massive substructure. The presence of this source isexplained assuming that merger-driven turbulence may re-accelerate high-energyparticles in the intracluster medium and generate diffuse radio emission on thecluster scale. The position of A1351 in the logP$ {1.4 GHz}$ - logL$ {X}$ planeis consistent with that of all other radio-halo clusters known to date,supporting a causal connection between the unrelaxed dynamical state of massive$>10^{15} M {\odot}$ clusters and the presence of giant radio halos.



Autor: S. Giacintucci, T. Venturi, R. Cassano, D. Dallacasa, G. Brunetti

Fuente: https://arxiv.org/



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