On the interpretation of dark matter self-interactions in Abell 3827
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On the interpretation of dark matter self-interactions in Abell 3827. / Kahlhoefer, Felix; Schmidt-Hoberg, Kai; Kummer, Janis; Sarkar, Subir.
I: Monthly Notices of the Royal Astronomical Society, Bind 452, Nr. 1, 2015, s. L54-L58.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - On the interpretation of dark matter self-interactions in Abell 3827
AU - Kahlhoefer, Felix
AU - Schmidt-Hoberg, Kai
AU - Kummer, Janis
AU - Sarkar, Subir
PY - 2015
Y1 - 2015
N2 - 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, insome tension with previous upper bounds.
AB - 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, insome tension with previous upper bounds.
KW - Faculty of Science
KW - astroparticle physics
KW - dark matter
U2 - 10.1093/mnrasl/slv088
DO - 10.1093/mnrasl/slv088
M3 - Journal article
VL - 452
SP - L54-L58
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 1
ER -
ID: 142231174