論文

査読有り
2016年4月6日

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

Nature
  • A. Wallner
  • J. Feige
  • N. Kinoshita
  • M. Paul
  • L. K. Fifield
  • R. Golser
  • M. Honda
  • U. Linnemann
  • H. Matsuzaki
  • S. Merchel
  • G. Rugel
  • S. G. Tims
  • P. Steier
  • T. Yamagata
  • S. R. Winkler
  • 全て表示

532
7597
開始ページ
69
終了ページ
72
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1038/nature17196
出版者・発行元
Nature Publishing Group

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 century1,2). Recent massive-star and supernova activity in Earth's vicinity may be traced by radionuclides with half-lives of up to 100 million years3-6, if trapped in interstellar dust grains that penetrate the Solar System. One such radionuclide is 60Fe (with a half-life of 2.6 million years)7,8, which is ejected in supernova explosions and winds from massive stars1,2,9. Here we report that the 60Fe signal observed previously in deep-sea crusts10,11 is global, extended in time and of interstellar origin from multiple events. We analysed deep-sea archives from all major oceans for 60Fe deposition via the accretion of interstellar dust particles. Our results reveal 60 Fe 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 60Fe 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.

リンク情報
DOI
https://doi.org/10.1038/nature17196
URL
http://www.nature.com/articles/nature17196.pdf
URL
http://www.nature.com/articles/nature17196
ID情報
  • DOI : 10.1038/nature17196
  • ISSN : 1476-4687
  • ISSN : 0028-0836
  • eISSN : 1476-4687
  • ORCIDのPut Code : 55943263
  • SCOPUS ID : 84963553713

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