Please use this identifier to cite or link to this item:
For citation please use:
Main Title: A Way Out of the Bubble Trouble?—Upon Reconstructing the Origin of the Local Bubble and Loop I via Radioisotopic Signatures on Earth
Author(s): Schulreich, Michael
Breitschwerdt, Dieter
Feige, Jenny
Dettbarn, Christian
Type: Article
Language Code: en
Abstract: Deep-sea archives all over the world show an enhanced concentration of the radionuclide 60Fe, isolated in layers dating from about 2.2 Myr ago. Since this comparatively long-lived isotope is not naturally produced on Earth, such an enhancement can only be attributed to extraterrestrial sources, particularly one or several nearby supernovae in the recent past. It has been speculated that these supernovae might have been involved in the formation of the Local Superbubble, our Galactic habitat. Here, we summarize our efforts in giving a quantitative evidence for this scenario. Besides analytical calculations, we present results from high-resolution hydrodynamical simulations of the Local Superbubble and its presumptive neighbor Loop I in different environments, including a self-consistently evolved supernova-driven interstellar medium. For the superbubble modeling, the time sequence and locations of the generating core-collapse supernova explosions are taken into account, which are derived from the mass spectrum of the perished members of certain, carefully preselected stellar moving groups. The release and turbulent mixing of 60Fe is followed via passive scalars, where the yields of the decaying radioisotope were adjusted according to recent stellar evolution calculations. The models are able to reproduce both the timing and the intensity of the 60Fe excess observed with rather high precision. We close with a discussion of recent developments and give future perspectives.
Issue Date: 25-Feb-2018
Date Available: 16-Sep-2019
DDC Class: 520 Astronomie und zugeordnete Wissenschaften
Subject(s): ISM bubbles
ISM supernova remnants
ISM abundances
methods: numerical
methods: analytical
Sponsor/Funder: DFG, SPP 1573, Physics of the Interstellar Medium
Journal Title: Galaxies
Publisher: MDPI
Publisher Place: Basel
Volume: 6
Issue: 1
Article Number: 26
Publisher DOI: 10.3390/galaxies6010026
EISSN: 2075-4434
Appears in Collections:Zentrum für Astronomie und Astrophysik » Publications

Files in This Item:
Format: Adobe PDF | Size: 2.1 MB
DownloadShow Preview

Item Export Bar

This item is licensed under a Creative Commons License Creative Commons