Publikationen

Recent near-Earth supernovae probed by global deposition of interstellar radioactive Fe-60

Autor(en)
A. Wallner, J. Feige, N. Kinoshita, Michael Paul, L. K. Fifield, R. Golser, M. Honda, U. Linnemann, H. Matsuzaki, S. Merchel, G. Rugel, S. G. Tims, P. Steier, T. Yamagata, Stephan Winkler
Abstrakt

The rate of supernovae in our local Galactic neighbourhood within a distance of about 100 parsecs from Earth is estimated to be one every 2-4 million years, based on the total rate in the Milky Way (2.0 +/- 0.7 per century(1,2)). Recent massive-star and supernova activity in Earth's vicinity may be traced by radionuclides with half-lives of up to 100 million years(3-6), if trapped in interstellar dust grains that penetrate the Solar System. One such radionuclide is Fe-60 (with a half-life of 2.6 million years)(7,8), which is ejected in supernova explosions and winds from massive stars(1,2,9). Here we report that the Fe-60 signal observed previously in deep-sea crusts(10,11) is global, extended in time and of interstellar origin from multiple events. We analysed deep-sea archives from all major oceans for Fe-60 deposition via the accretion of interstellar dust particles. Our results reveal Fe-60 interstellar influxes onto Earth at 1.5-3.2 million years ago and at 6.5-8.7 million years ago. The signal measured implies that a few per cent of fresh Fe-60 was captured in dust and deposited on Earth. Our findings indicate multiple supernova and massive-star events during the last ten million years at distances of up to 100 parsecs.

Organisation(en)
Isotopenphysik
Externe Organisation(en)
Australian National University, Technische Universität Berlin, Shimizu Corp, Inst Technol, Hebrew University Jerusalem, University of Tsukuba, Senckenberg Naturhistorische Sammlungen Dresden, University of Tokyo, Helmholtz-Zentrum Dresden-Rossendorf, Nihon University
Journal
Nature
Band
532
Seiten
69-72
Anzahl der Seiten
4
ISSN
0028-0836
DOI
https://doi.org/10.1038/nature17196
Publikationsdatum
04-2016
Peer-reviewed
Ja
ÖFOS 2012
103014 Kernphysik, 103004 Astrophysik
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/recent-nearearth-supernovae-probed-by-global-deposition-of-interstellar-radioactive-fe60(a37ff04b-ddc8-42fe-931a-acd116525825).html