Abstract

Contributed Talk - Splinter jungeAG   (MW-0337)

Comparing thermal and non-thermal emission of galactic outflows

Philipp Salewsky, Dominik J. Bomans
Astronomisches Institut, Ruhr-Universität Bochum

Galactic outflows are an important signature of feedback processes and play a key role in the evolution of galaxies. They can be traced across multiple wavelength regimes using different observational diagnostics. In optical integral-field spectroscopy, outflows can be identified e.g. through enhanced [N II]/Hα line ratios, while low-frequency radio continuum observations trace mostly the non-thermal emission. Interestingly, not all galaxies exhibiting optical signatures of outflows show corresponding radio emission, and vice versa. This contribution presents a comparative study of optical and radio outflow tracers based on galaxies from the CALIFA survey and LOFAR Data Release 3 150 MHz continuum observations. By combining spatially resolved optical spectroscopy with sensitive low-frequency radio data, the correspondence between optical and non thermal radio signatures of galactic outflows is investigated, especially in view of different driving mechanisms of galactic outflows. First results confirm the importance of star formation rate density and outflow strength, but show differences in the radio and optical outflow properties of the sample galaxies, pointing at additional critical parameters governing outflow/wind properties.