dc.contributor.author | Siegert, Thomas | |
dc.contributor.author | Pleintinger, Moritz M. M. | |
dc.contributor.author | Diehl, Roland | |
dc.contributor.author | Krause, Martin G. H. | |
dc.contributor.author | Greiner, Jochen | |
dc.contributor.author | Weinberger, Christoph | |
dc.date.accessioned | 2023-04-12T10:45:01Z | |
dc.date.available | 2023-04-12T10:45:01Z | |
dc.date.issued | 2023-03-30 | |
dc.identifier.citation | Siegert , T , Pleintinger , M M M , Diehl , R , Krause , M G H , Greiner , J & Weinberger , C 2023 , ' Galactic Population Synthesis of Radioactive Nucleosynthesis Ejecta ' , Astronomy & Astrophysics , vol. 672 . https://doi.org/10.1051/0004-6361/202244457 | |
dc.identifier.issn | 0004-6361 | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/2301.10192v1 | |
dc.identifier.other | ORCID: /0000-0002-9610-5629/work/133139511 | |
dc.identifier.uri | http://hdl.handle.net/2299/26161 | |
dc.description | © The Authors 2023. This is an Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0). | |
dc.description.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 $^{26}$Al, $^{60}$Fe or $^{44}$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 Galaxy which incorporate the population synthesis calculations of individual massive star groups. Based on a variety of stellar evolution models, supernova explodabilities, and density distributions, we find that the measured $^{26}$Al distribution from INTEGRAL/SPI can be explained by a Galaxy-wide population synthesis model with a star formation rate of $4$-$8\,\mathrm{M_{\odot}\,yr^{-1}}$ and a spiral-arm dominated density profile with a scale height of at least 700 pc. Our model requires that most massive stars indeed undergo a supernova explosion. This corresponds to a supernova rate in the Milky Way of $1.8$-$2.8$ per century, with quasi-persistent $^{26}$Al and $^{60}$Fe masses of $1.2$-$2.4\,\mathrm{M_{\odot}}$ and $1$-$6\,\mathrm{M_{\odot}}$, respectively. Comparing the simulated morphologies to SPI data suggests that a frequent merging of superbubbles may take place in the Galaxy, and that an unknown but strong foreground emission at 1.8 MeV could be present. | en |
dc.format.extent | 19 | |
dc.format.extent | 10136225 | |
dc.language.iso | eng | |
dc.relation.ispartof | Astronomy & Astrophysics | |
dc.subject | astro-ph.GA | |
dc.subject | astro-ph.HE | |
dc.title | Galactic Population Synthesis of Radioactive Nucleosynthesis Ejecta | en |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | School of Physics, Engineering & Computer Science | |
dc.contributor.institution | Department of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1051/0004-6361/202244457 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |