In interpreting the INTEGRAL/SPI data from radioactive 26Al originating
from Galactic nucleosynthesis sources, a new bottom-up concept has been
established. This starts from what we know about stellar evolution and
the yields of 26Al ejections from massive stars and their supernovae,
then performs a population synthesis modelling of coeval groups of stars
(as done before). Now we exploit this modeling of 26Al sources, and
place stellar-group components to where astronomical knowledge tells us
they are, supplement this by a Monte-Carlo sample from a large-scale
Galactic stargroup distribution, and perform ray tracing of the
so-placed 26Al sources to INTEGRAL observations here at our location
near the Sun. The top figure shows the modelled appearance of the 26Al
sky, which is remarkably close to observations, see, e.g., INTEGRAL
POM March 2015. The pyramid shows how
different components add up to this model.
"Galactic Population Synthesis of Radioactive Nucleosynthesis Ejecta",
Thomas Siegert, Moritz M.M. Pleintinger, Roland Diehl, Martin G. H. Krause, Jochen Greiner, and Christoph Weinberger,
Astronomy & Astrophysics, in press (2023) https://ui.adsabs.harvard.edu/abs/2023arXiv230110192S/abstract
