期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 452, 期 1, 页码 L54-L58出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/slv088
关键词
astroparticle physics; galaxies: clusters: individual: Abell 3827; galaxies: kinematics and dynamics; dark matter
资金
- German Science Foundation (DFG) under the Collaborative Research Center [(SFB) 676]
- ERC starting grant NewAve [638528]
- Science and Technology Facilities Council [ST/L000474/1, ST/J000507/1, PP/C506205/1] Funding Source: researchfish
- STFC [ST/L000474/1, PP/C506205/1, ST/J000507/1] Funding Source: UKRI
Self-interactions of darkmatter (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 (sigma) over tilde /m(DM) similar to 3 cm(2) g(-1) when self-interactions result in an effective drag force and sigma/m(DM) similar to 1.5 cm(2) g(-1) for the case of contact interactions, in some tension with previous upper bounds.
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