Modeling the local bubble using multiple supernova remnants

Abstract

We have modeled the Local Bubble (LB) using a one-dimensional hydrocode (odin) that can simulate multiple supernova remnants, with non-equilibrium ion evolution and dust. Our model assumes that the local interstellar medium was a cool (10⁴ K) gas approximately 5–10 Myr ago; it was then disturbed by 2 or 3 supernovae exploding within 20–30 pc of each other over a period of 2–4 million years. The LB is the leftover hot gas from these explosions. The model predicts the x-ray emission from such a bubble, as well as ionic abundances for hot gas ions such as O vi. These are compared to the soft x-ray data from the Wisconsin all-sky survey and the ROSAT PSPC.