Abstract

Contributed Talk - Splinter SNR

Tuesday, 12 September 2023, 14:40   (H 2035)

Tracing massive star ejecta through the Galaxy with radioactive decay lines

Martin Krause
University of Hertfordshire

Hard X-ray and soft gamma ray lines from radioactive decay of 26Al and 60Fe have been observed from the Milky Way. The respective emission contains information about the ejecta of supernovae, massive-star winds. The distinct spatial and kinematic structure of the different lines allows to trace the flow of the ejecta through the interstellar medium. We have also modelled these processes with 3D hydrodynamic simulations. We find that while part of the ejecta mixes locally and may enrich newly formed stellar systems, a large fraction of the massive star ejecta leaves their immediate surroundings quickly, likely in large superbubble structures, and may even diffuse into the Galactic halo on the decay timescale of 26Al (~1 Myr).