2022A&A...666A..41E


Query : 2022A&A...666A..41E

2022A&A...666A..41E - Astronomy and Astrophysics, volume 666A, 41 (2022/10-1)

Constraints on dark matter self-interaction from the internal density profiles of X-COP galaxy clusters.

ECKERT D., ETTORI S., ROBERTSON A., MASSEY R., POINTECOUTEAU E., HARVEY D. and McCARTHY I.G.

Abstract (from CDS):

The fundamental properties of the postulated dark matter (DM) affect the internal structure of gravitationally bound structures. In the cold dark matter paradigm, DM particles interact only via gravity. Their distribution is well represented by an Einasto profile with shape parameter α ≈ 0.18 in the smallest dwarf galaxies or the most massive galaxy clusters alike. Conversely, if DM particles self-interact via additional forces, we expect the mass density profiles of DM halos to flatten in their central regions, thereby increasing the Einasto shape parameter. We measured the structural properties of 12 massive galaxy clusters from observations of their hot gaseous atmosphere, using the X-ray observatory XMM-Newton, and of the Sunyaev-Zel'dovich effect using the Planck all-sky survey. After removing morphologically disturbed systems, we measured Einasto shape parameters with mean ⟨α⟩=0.19 ± 0.03 and intrinsic scatter σα = 0.06, which is in close agreement with the prediction of the cold dark matter paradigm. We used cosmological hydrodynamical simulations of cluster formation with self-interacting DM (BAHAMAS-SIDM) to determine how the Einasto shape parameter depends on the self-interaction cross section. We used the fitted relation to turn our measurements of α into constraints on the self-interaction cross section, which imply σ/m < 0.19 cm2 g–1 (95% confidence level) at collision velocity v_DM - DM_ ∼ 1000 km s–1. This is lower than the interaction cross section required for DM self-interactions to solve the core-cusp problem in dwarf spheroidal galaxies, unless the cross section is a strong function of velocity.

Abstract Copyright: © D. Eckert et al. 2022

Journal keyword(s): dark matter - X-rays: galaxies: clusters - galaxies: clusters: general - galaxies: clusters: intracluster medium

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 910 0
2 ACO 3158 ClG 03 42 39.6 -53 37 50           ~ 305 0
3 ACO 3266 ClG 04 31 11.9 -61 24 23           ~ 411 0
4 ACO 644 ClG 08 17 24.5 -07 30 46           ~ 225 0
5 ZwCl 1215+0400 ClG 12 17 43.62 +03 38 51.5           ~ 153 0
6 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 366 1
7 ACO 1795 ClG 13 48 50.48 +26 35 07.4           ~ 1268 0
8 ACO 2029 ClG 15 10 56.2 +05 44 42           ~ 943 0
9 ACO 2142 ClG 15 58 14.38 +27 12 57.8           ~ 770 0
10 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 569 0
11 CIZA J1825.3+3026 ClG 18 25 22.8 +30 26 32           ~ 49 0
12 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 462 1

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