Abstract

Contributed Talk - Splinter DwarfGalaxies

Monday, 09 September 2024, 17:30   (S24)

Exploring magnetised galactic outflows in dwarf galaxies

Sam Taziaux
Ruhr University Bochum

Dwarf galaxies are an important class of galaxies, which are known to serve as proxy for the early Universe and play a crucial role in the formation and evolution of larger galaxies. To understand the underlying emission mechanism and the physics that drive the radiation far away from their origin, we perform a radio continuum polarimetry study of the starburst galaxy NGC 3125 using a combination of ATCA and MeerKAT observations. At a frequency of 2.1GHz, our ATCA observations reveal a extensive radio halo surrounding NGC 3125, extending notably along its minor axis, likely attributed to galactic outflow winds. Analysis of the spectral index map reveals a rapid dissipation of electrons over kiloparsec scales, a phenomenon contrasting sharply with observations from grand spiral galaxies. These findings provide evidence of intense material feedback into the intergalactic medium, a process expected to be prevalent in the protogalaxies of the early Universe. By investigating the strength and configuration of the magnetic field and cosmic ray transport, we aim to determine whether a highly ordered magnetic field at the galaxy edges and a turbulent magnetic field towards the core are common in such galaxies, as proposed in a previous study (NGC 1569).