First detection at 5.5 and 9 GHz of the radio relics in bullet cluster with ATCA
arXiv:1606.08700 · doi:10.1007/s10509-016-2844-7
Abstract
We present here results from observations at 5.5 and 9 GHz of the Bullet cluster 1E 0657-55.8 with the Australia Telescope Compact Array (ATCA). Our results show detection of diffuse emission in the cluster. Our findings are consistent with the previous observations by Shimwell et al. (2014) and Shimwell et al. (2015) at 1.1-3.1 GHz. Morphology of diffuse structures (relic regions A and B and the radio halo) are consistent with those reported by the previous study. Our results indicate steepening in the spectral index at higher frequencies (at and greater than 5.0 GHz) for region A. The spectrum can be fit well by a broken power law. We discuss the possibility of a few recent theoretical models explaining this break in the power law spectrum, and find that a modified Diffusive Shock Acceleration (DSA) model or a turbulent reacceleration model may be relevant. Deep radio observations at high frequencies (at and greater than 5 GHz) are required for a detailed comparison with this model.
Accepted for publication in Astrophysics & Space Science. 18 pages, 5 figures, 2 tables
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- Deep low-frequency radio observations of Abell 2256 I: The filamentary radio relic
- MeerKAT's View of the Bullet Cluster 1E 0657-55.8
- Relativistic inverse Compton scattering of photons from the early universe
- Acceleration of cosmic rays by double shock waves in galaxy clusters: application to radio relics