Journal article
On the interpretation of dark matter self-interactions in Abell 3827
- Abstract:
- Self-interactions of dark matter particles can potentially lead to an observable separation between the dark matter halo and the stars of a galaxy moving through a region of large dark matter 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 $\tilde{\sigma}/m_\text{DM} \sim 3\:\text{cm}^2\:\text{g}^{-1}$ when self-interactions result in an effective drag force and $\sigma/m_\text{DM} \sim 1.5\:\text{cm}^2\:\text{g}^{-1}$ for the case of contact interactions, in some tension with previous upper bounds.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 430.6KB, Terms of use)
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- Publisher copy:
- 10.1093/mnrasl/slv088
Authors
- Publisher:
- Oxford University Press
- Journal:
- Monthly Notices of the Royal Astronomical Society More from this journal
- Volume:
- 452
- Issue:
- 1
- Pages:
- L54–L58
- Publication date:
- 2015-07-17
- Acceptance date:
- 2015-06-26
- DOI:
- EISSN:
-
1745-3933
- ISSN:
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0035-8711
- Keywords:
- Pubs id:
-
pubs:522015
- UUID:
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uuid:0e333983-2c04-4ab7-b233-751df455b092
- Local pid:
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pubs:522015
- Source identifiers:
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522015
- Deposit date:
-
2016-06-05
Terms of use
- Copyright holder:
- © 2015 Kahlhoefer, et al Published by Oxford University Press on behalf of the Royal Astronomical Society
- Copyright date:
- 2015
- Notes:
- This is the publisher's version of the article. The final version is available online from Oxford University Press at: 10.1093/mnrasl/slv088
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