Galactic Population Synthesis of Radioactive Nucleosynthesis Ejecta
Thomas Siegert, Moritz M. M. Pleintinger, Roland Diehl, Martin G. H., Krause, Jochen Greiner, Christoph Weinberger

TL;DR
This paper develops a galactic population synthesis model for radioactive ejecta, matching gamma-ray observations to infer star formation rates, supernova activity, and the distribution of nucleosynthesis products in the Milky Way.
Contribution
It introduces a flexible population synthesis code tailored for gamma-ray data, linking stellar evolution, supernovae, and galactic structure to observed radioactive isotope distributions.
Findings
The model explains the observed $^{26}$Al distribution with specific star formation rates.
Supernova rate in the Milky Way estimated at 1.8-2.8 per century.
Suggests frequent superbubble merging and potential foreground emission at 1.8 MeV.
Abstract
Diffuse gamma-ray line emission traces freshly produced radioisotopes in the interstellar gas, providing a unique perspective on the entire Galactic cycle of matter from nucleosynthesis in massive stars to their ejection and mixing in the interstellar medium. We aim at constructing a model of nucleosynthesis ejecta on galactic scale which is specifically tailored to complement the physically most important and empirically accessible features of gamma-ray measurements in the MeV range, in particular for decay gamma-rays such as Al, Fe or Ti. Based on properties of massive star groups, we developed a Population Synthesis Code which can instantiate galaxy models quickly and based on many different parameter configurations, such as the star formation rate, density profiles, or stellar evolution models. As a result, we obtain model maps of nucleosynthesis ejecta in the…
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Taxonomy
TopicsGamma-ray bursts and supernovae · Nuclear physics research studies · Neutrino Physics Research
