Special Colloquium: Amanda Wilber (Host: Moire Prescott)

April 17, 2019 @ 3:15 pm – 4:15 pm
AY 119

Searching for diffuse radio emission in merging galaxy clusters with LOFAR

Amanda Wilber, Universität Hamburg

Galaxy cluster mergers are powerful drivers of turbulence and shocks, which can accelerate cosmic-ray electrons within the magnetic field of the intracluster medium (ICM) to generate Megaparsec-sized radio structures. Actively merging clusters are excellent astrophysical laboratories for studying the nature of magnetic fields and the physics of particle acceleration. Questions still remain in identifying the source of cosmic-ray electrons that appear to fill the ICM so uniformly, and in determining the origin and amplification mechanisms of cluster magnetic fields. With its high-resolution, extended coverage, and sensitivity to radio emission with low surface brightness, the LOw Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) gives us an unparalleled opportunity to hunt for diffuse radio sources in distant galaxy clusters. In this talk I present the results of LoTSS observations which reveal never-before-seen diffuse radio emission in the merging galaxy clusters Abell 1132 and Abell 1314.

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