We investigate the dynamical effects of cosmic rays (CRs) in isolated disc galaxies. CRs are included as a non-thermal component in the advection-diffusion approximation and are dynamically coupled to the gas in the magneto-hydrodynamical simulations. The CRs are spectrally resolved with a full spectrum ranging from sub-GeV to TeV in every computational cell. We can therefore account for energy-dependent losses and include an energy-dependent diffusive transport in every cell. We show the differences between a grey CR approximation and our new spectrally resolved CRs concerning galactic outflows and gamma ray mock observations. We highlight, where the steady state approximation for CR spectra is a valid approach as well as where and now strongly the spectra vary spatially in different regions of the galaxy and temporally over the course of several Gyr.
galaxies; CR spectra, CR propsagation, outflows, spectral index