9 NOVEMBRE 2021 ore 15:00

The Faraday sky and its connection to the Galactic magnetic field

Dr. Sebastian Hutschenreuter (Radboud University Nijmegen, Paesi Bassi)
The Faraday sky and its connection to the Galactic magnetic field

The Faraday effect describes the rotation of the polarization position angle propagating through magnetized plasma and provides information on the line-of-sight component of magnetic fields weighted by the thermal electron density.
These quantities are key puzzle pieces for the characterization and modeling of the structure of the Milky Way's magnetic field and of many extra-Galactic astrophysical objects, from stars over galaxies to large cosmological objects such as galaxy clusters. A better understanding of these structures is not only an interesting topic on its own merit, but it may also provide a pathway to understanding the origin of the magnetic field in the Universe as a whole.
Thus, a primary objective of research on cosmic magnetism has been the investigation of the polarimetric properties of astrophyiscal objects in the hope of obtaining insights into their morphology and formation history.

In my talk I will present how one can turn the dense coverage of available Faraday rotation data into a full sky estimate of the Galactic Faraday sky.
This will involve a discussion on statistical methods, modelling and the physical implications of our results. In particular, I will outline how we can combine the Galactic Faraday sky with other data sets to get a direct estimate of the Galactic magnetic field.
At last, I would like to introduce the IMAGINE collaboration, which aims to achieve a holistic inference of the Galactic magnetic field by combining all available data sets, models and and methods into a single framework.

Breve CV del Dr. Sebastian Hutschenreuter:

He is a PostDoc at the Radboud University Nijmegen in the Netherlands in the group of Marijke Haverkorn. He has pursued his Masters in Physics at the Universities of Munich (LMU) and Copenhagen, before obtaining his PhD at the Max Plank Institute for Astrophysics in Garching under the supervision of Torsten Enßlin.
His research interest covers magnetic fields from the Galactic to the cosmological scale. He has specialized on large scale inferences of magnetic fields and corresponding observables, such as the Galactic Faraday sky. In that role, he is also part of the IMAGINE consortium and its software development team.