Gamma-ray spectroscopy of galactic nucleosynthesis

Roland Diehl, Jochen Greiner, Martin Krause, Moritz Pleintinger, Thomas Siegert

Research output: Contribution to conferencePaperpeer-review

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Abstract

Diffuse gamma-ray emission from the decay of radioactive $^{26}$Al is a messenger from the nucleosynthesis activity in our current-day galaxy. Because this material is attributed to ejections from massive stars and their supernovae, the gamma-ray signal includes information about nucleosynthesis in massive star interiors as it varies with evolutionary stages, and about their feedback on the surrounding interstellar medium. Our method of population synthesis of massive-star groups has been refined as a diagnostic tool for this purpose. It allows to build a bottom-up prediction of the diffuse gamma-ray sky when known massive star group distributions and theoretical models of stellar evolution and core-collapse supernova explosions are employed. We find general consistency of an origin in such massive-star groups, in particular we also find support for the clumpy distribution of such source regions across the Galaxy, and characteristics of large cavities around these. A discrepancy in the integrated $^{26}$Al gamma-ray flux is interpreted as an indication for excess $^{26}$Al emission from nearby, distributed in cavities that extend over major regions of the sky.
Original languageEnglish
Pages1-6
Number of pages6
DOIs
Publication statusE-pub ahead of print - 22 Mar 2023
EventNuclear Physics in Astrophysics X - Geneva, Italy
Duration: 5 Sept 20229 Sept 2022
https://indico.cern.ch/event/804609/#:~:text=Every%20two%20years%20the%20Nuclear,and%20fast%20developing%20research%20fields.

Conference

ConferenceNuclear Physics in Astrophysics X
Abbreviated titleNPA-X 20222
Country/TerritoryItaly
CityGeneva
Period5/09/229/09/22
Internet address

Keywords

  • astro-ph.HE

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