Le 9 février 2018
De 10h30 à 12h00
Yelena Stein
Observatoire astronomique de Strasbourg
The main topic of this talk are magnetic fields and the transport processes of cosmic ray particles. This is investigated in the three edge-on galaxies NGC 4666, NGC 4013 and NGC 4217 from the CHANG-ES Survey, which was observed at 1.5 GHz and 6 GHz with the JVLA. The polarisation data (with the additional usage of rm-synthesis) revealed the magnetic field structure of NGC 4666 and NGC 4217 to be X-shaped. Magnetic field strength are calculated for all galaxies pixel based via equipartition. Furthermore a thermal/ non-thermal separation was conducted. NGC 4666 is characterised by a box-shaped radio halo which originated from a starformation induced superwind. NGC 4217 shows a dumbell-shaped radio halo, where the main energy loss of the particles is due to synchrotron losses. The 1-D transport model shows that the main transport process for NGC 4666 is advection, for NGC 4217 advection and diffusion and for NGC 4013 diffusion.