Impact Of Magnetic Fields On Cosmic Ray Density In Molecular Clouds

We investigate the effects caused by Cosmic Rays (CRs) in a Molecular Clouds (MCs) environment and the effects of varied magnetic field configurations in the core (r = 1 Pc ) of a MC. We take as initial conditions for the interstellar medium a product of various supernova explosions as injected initial perturbation and observe the evolution during the timescale of ~4.5 Myrs. We compute the CR reduction factor R as a measure of the density of a distribution of particles traveling with a guiding center along randomized field lines near the core and discuss their impact on the ionization rate. We employ data from ideal and non-ideal MHD simulations using AREPO (Alexander Mayer, MPA) in the densest region for each snapshot, characterizing lines of sight with column densities as a parameter for the evolutionary stage of the MC; also, we observe the correlation between reduction factor and the gas density at said position. Our results point towards an important attenuation of the CR density which may affect the ionization rate inside the MC, thereafter influencing the coupling between the magnetic field and the gas density.