Gamma-Rays from Nucleosynthesis Ejecta

6th Nuclear Physics in Astrophysics

物理学;天文学

Diehl, R.^1,2

Max Planck Institut für Extraterrestrische Physik, Garching

D-85748, Germany^1

Excellence Cluster Universe, Garching

D-85748, Germany^2

关键词: Extended sources;    Gamma-ray line;    Interstellar space;    Isotopic ratios;    Radioactive decay;    Solar system formation;    Stellar structure;    Supernova explosion;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/665/1/012011/pdf
DOI  :  10.1088/1742-6596/665/1/012011

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Gamma-ray lines from radioactive decay of unstable isotopes produced in massive- star and supernova nucleosynthesis have been measured with INTEGRAL over the past ten years, complementing the earlier COMPTEL survey.26Al has become a tool to study specific source regions, such as massive-star groups and associations in nearby regions which can be discriminated from the galactic-plane background, and the inner Galaxy where Doppler shifted lines add to the astronomical information. Recent findings are that superbubbles show a remarkable asymmetry, on average, in the spiral arms of our galaxy.60Fe is co-produced by the sources of26Al, and the isotopic ratio from their nucleosynthesis encodes stellar-structure information. Annihilation gamma-rays from positrons in interstellar space show a puzzling bright and extended source region central to our Galaxy, but also may be partly related to nucleosynthesis.56Ni and44Ti isotope gamma-rays have been used to constrain supernova explosion mechanisms. Here we summarize latest results using the accumulated multi-year database of observations, and discuss their astrophysical interpretations. We also add a comparison of isotopic ratios between the ISM of the current Galaxy and the solar vicinity at solar-system formation time.