Speaker
Description
Hotspots are bright and compact regions at the edge of powerful radio galaxies which represent the working surface of the supersonic jets produced by an AGN. Their radio to X-ray synchrotron emission proves that particle acceleration is highly efficient in shocks developing hundred-kpc away from the central engine, with particles accelerated to Lorentz factors >10^6-10^7. Moreover, the detection of diffuse optical emission, points to a role of turbulence in re-accelerating particles in the back-flowing plasma. As such, hotspots are excellent laboratories to investigate different mechanisms of particle acceleration. First, I will present the results of our effort to probe the geometry of the hotspot regions and magnetic field configuration, based on JVLA multi-frequency (300 MHz-20 GHz) observations. Then I will discuss progress possible thanks to the huge improvement in sensitivity and angular resolution in the MHz regime of SKA.
| Reasearch area | Extragalactic Continuum (galaxies/AGN, galaxy clusters) |
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