SKA-Korea is a group of scientists from the Korean astronomy community interested in the science and technology of the Square Kilometer Array (SKA) and closely related fields. We are happy to announce the next colloquium talk by Prof. Shane O'Sullivan. The talk will be broadcasted by Zoom. Everyone is warmly invited to join. Please find below details of the talk.

* Title: The dark magnetised Universe illuminated by Faraday rotation

* Speaker: Prof. Shane O'Sullivan (Dublin City University)

* Date and time: 5월 24일 (수) 16:00-17:30

* Venue: Online

* Zoom link:

https://us02web.zoom.us/j/83056491492?pwd=dHM3eTNBb2d0OHV5ci9xdEUwUlZxdz09

* Abstract:
Radio-loud AGN can be observed throughout the majority of the history of the Universe and are thus excellent beacons for measuring the properties of the intergalactic medium and its evolution. Here I will highlight recent results from the LOFAR and ASKAP radio telescopes, that use the effect of Faraday rotation to illuminate dark phases of gas that are very challenging to detect by other means. In particular, I will focus on the magnetised gas properties of filaments (WHIM) and the halos of galaxies (CGM), while also highlighting the detection of large reservoirs of ionised gas beyond that traced by the X-ray-emitting intracluster medium. As the quality and quantity of the radio data improves, we can combine it with other tracers of cosmic structure in order to better understand the role this diffuse magnetised gas plays in the evolution of galaxies and the cosmic web in general.