On the interpretation of dark matter self-interactions in Abell 3827
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Self-interactions of dark matter (DM) particles can potentially lead to an observable separation between the DM halo and the stars of a galaxy moving through a region of large DM density. Such a separation has recently been observed in a galaxy falling into the core of the galaxy cluster Abell 3827.We estimated the DM self-interaction cross-section needed to reproduce the observed effects and find that the sensitivity of Abell 3827 has been significantly overestimated in a previous study.Our corrected estimate is σ˜/m_DM ∼ 3 cm^2 g^−1 when self-interactions result in an effective drag force and σ/m_DM ∼ 1.5 cm^2 g^−1 for the case of contact interactions, in
some tension with previous upper bounds.
some tension with previous upper bounds.
Originalsprog | Engelsk |
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Tidsskrift | Monthly Notices of the Royal Astronomical Society |
Vol/bind | 452 |
Udgave nummer | 1 |
Sider (fra-til) | L54-L58 |
Antal sider | 5 |
ISSN | 0035-8711 |
DOI | |
Status | Udgivet - 2015 |
- Det Natur- og Biovidenskabelige Fakultet
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ID: 142231174