Köln 2025 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 4: Application to Astrophysics
MS 4.3: Vortrag
Dienstag, 11. März 2025, 16:30–16:45, HS 2 Chemie
Interstellar 60Fe in Antarctic Ice Tracing the Local Interstellar Cloud — •Annabel Rolofs1, Dominik Koll1,2,3, Florian Adolphi4, Sebastian Fichter1, Maria Hörhold4, Johannes Lachner1, Stefan Pavetich2, Georg Rugel1, Stephen Tims2, Sebastian Zwickel1,3, and Anton Wallner1,2,3 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Australian National University, Canberra, Australia — 3TUD Dresden University of Technology, Dresden, Germany — 4Alfred-Wegener-Institut, Bremerhaven, Germany
60Fe (t1/2=2.6 Myr) is formed in massive stars and can be transported to Earth if embedded into interstellar dust grains. Previous studies found 60Fe in million-year-old marine archives and on the Moon. A recent influx of interstellar 60Fe was discovered in Antarctic surface snow and with sediment data it was shown that this recent influx extends back to at least 33 kyr ago. The solar system entered a denser substructure of the otherwise thin Local Bubble about 40 kyr ago, the Local Interstellar Cloud (LIC).
To investigate a connection between the entry into the LIC and an interstellar 60Fe influx, 295 kg of continuous flow analysis water from the EDML ice core in Antarctica, spanning 40 - 80 kyr BP, were analysed. A suite of cosmogenic radionuclides, 10Be, 26Al, 41Ca and 53Mn, was measured by accelerator mass spectrometry to assess any potential losses of interstellar 60Fe. The cosmogenic radionuclide abundance as well as the amount of interstellar 60Fe deposited into Antarctic ice will be discussed and a connection to the LIC will be drawn.
Keywords: AMS; Local Interstellar Cloud; Supernova; Antarctica; Ice Core