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  Steady-state nucleosynthesis throughout the Galaxy

Diehl, R., Krause, M. G. H., Kretschmer, K., Lang, M., Pleintinger, M. M. M., Siegert, T., et al. (2020). Steady-state nucleosynthesis throughout the Galaxy. New Astronomy Reviews, 92: 101608. doi:10.1016/j.newar.2020.101608.

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Diehl, Roland1, Author              
Krause, Martin G. H.1, Author              
Kretschmer, Karsten1, Author              
Lang, Michael1, Author              
Pleintinger, Moritz M. M.1, Author              
Siegert, Thomas1, Author              
Wang, Wei1, Author              
Bouchet, Laurent, Author
Martin, Pierrick, Author
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1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: Measurement and astrophysical interpretation of characteristic gamma-ray lines from nucleosynthesis was one of the prominent science goals of the INTEGRAL mission and in particular its spectrometer SPI. Emission from 26Al and from 60FeAl decay lines originates from accumulated ejecta of nucleosynthesis sources, and appears diffuse in nature. 26Al and 60FeAl are believed to originate mostly from massive star clusters. Gamma-ray observations open an interesting window to trace the fate and flow of nucleosynthesis ejecta, after they have left the immediate sources and their birth sites, and on their path to mix with ambient interstellar gas. The INTEGRAL 26Al emission image confirms earlier findings of clumpiness and an extent along the entire plane of the Galaxy, supporting its origin from massive-star groups. INTEGRAL spectroscopy resolved the line and found Doppler broadenings and systematic shifts from large-scale galactic rotation. But an excess velocity of ~200 km/s suggests that 26Al decays preferentially within large superbubbles that extend in forward directions between spiral arms. The detection of 26Al line emission from nearby Orion and the Eridanus superbubble supports this interpretation. Positrons from beta+ decays of 26Al and other nucleosynthesis ejecta have been found to not explain the morphology of positron annihilation gamma-rays at 511 keV that have been measured by INTEGRAL. The 60FeAl signal measured by INTEGRAL is diffuse but too weak for an imaging interpretation, an origin from point-like/concentrated sources is excluded. The 60FeAl/26Al ratio is constrained to a range 0.2-0.4. Beyond improving precision of these results, diffuse nucleosynthesis contributions from novae (through 22Na radioactivity) and from past neutron star mergers in our Galaxy (from r-process radioactivity) are exciting new prospects for the remaining mission extensions.

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Language(s): eng - English
 Dates: 2020-12-24
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.newar.2020.101608
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Title: New Astronomy Reviews
  Other : New Astron. Rev.
Source Genre: Journal
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Pages: - Volume / Issue: 92 Sequence Number: 101608 Start / End Page: - Identifier: ISSN: 1387-6473
ISSN: 1387-6473
ISSN: 1872-9630