IAP - High-Energy Universe Group Seminar

Thursday Oct 10, 2024, 11:00 AM → 12:15 PM Europe/Berlin

B425 R206 (KIT-CN-IAP)

Semester WS 2024/25

This week we welcome an external guest:

Alexander Korochkin

UL Brussels, Belgium

"The Milky Way magnetic halo, the Local Bubble and UHECR deflections"  

chair: Michael Unger

 

abstract:

I will present a new model of the coherent Galactic magnetic field (GMF) outside the thin disk. The model was fitted to the recent catalog of Faraday rotation measures of extragalactic sources and the synchrotron polarization data from WMAP. It includes spiral arms, the toroidal halo, the X-shaped field and the compressed field in the wall of the Local Bubble. The latter is taken into account for the first time, allowing us to avoid invoking striated fields. Thus, I will show that the Local Bubble wall might be responsible for about 50% of the polarized emission at high Galactic latitudes. Additionally, I will show that the Fan Region, previously thought to be a local structure, can be modeled as a Galactic-scale feature. The pitch angle of the disk field in our fit converged to the value around 20 degrees, which is very close to the direction of spiral arms inferred recently from Gaia data. Finally, I will present the deflections of UHECRs in our model and compare them with deflections predicted by other popular models.

 

 

korochkin_presentation.pdf