Open Access60 Fe deposition during the late Pleistocene and the Holocene echoes past supernova activity
Author(s) -
A. Wallner,
Jenny Feige,
L.K. Fifield,
M.B. Froehlich,
Robin Golser,
M.A.C. Hotchkis,
Dominik Koll,
G. Leckenby,
Martin Martschini,
Silke Merchel,
Sonja Panjkov,
Stefan Pavetich,
Georg Rugel,
S.G. Tims
Publication year - 2020
Publication title -
proceedings of the national academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.1916769117
Subject(s) - ejecta , supernova , cosmic ray , interstellar medium , solar system , physics , near earth supernova , geology , astrobiology , astronomy , astrophysics , galaxy , supernova remnant
Significance Nearby supernova explosions shape the interstellar medium. Ejecta, containing fresh nucleosynthetic products, may traverse the solar system as a transient passage, or alternatively the solar system may traverse local clouds that may represent isolated remnants of supernova explosions. Such scenarios may modulate the galactic cosmic-ray flux intensity to which Earth is exposed. Varying conditions of the traversed interstellar medium could have impacts on climate and can be imprinted in the terrestrial geological record. Some radionuclides, such as60 Fe, are not produced on Earth or within the solar system in significant quantities. Their existence in deep-sea sediments demonstrates recent production in close-by supernova explosions with a continued influx of60 Fe until today.
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