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Home All issues Volume 703 (November 2025) A&A, 703 (2025) A234 Full HTML
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Table A.1

Simulation properties and parameters.

Sim. name σV/m [cm2 g−1] w [km s−1] angular depend. mn [M⊙] N rcut [rs] ϵ [pc] η Nngb τ Δtmin [Gyr]
A 0 − − 1.39 × 103 2 × 106 15 6.4 2.5 × 10−2 − − −
B 0 − − 1.39 × 103 2 × 106 15 1.0 2.5 × 10−2 − − −
C 0 − − 1.39 × 103 2 × 106 15 1.0 − − − 2.2 × 10−5
D 0 − − 2.78 × 102 1 × 107 15 6.4 2.5 × 10−2 − − −
E 0 − − 2.78 × 102 1 × 107 15 1.0 2.5 × 10−2 − − −
F 0 − − 5.57 × 101 5 × 107 15 1.0 2.5 × 10−2 − − −
G 80 − iso. 1.39 × 103 1.69 × 106 10 6.4 2.5 × 10−2 48 0.04 −
H 80 − iso. 1.39 × 103 2 × 106 15 6.4 1 × 10−3 48 0.04 −
I 80 − iso. 1.39 × 103 2 × 106 15 6.4 5 × 10−3 48 0.04 −
J 80 − iso. 1.39 × 103 2 × 106 15 6.4 2.5 × 10−2 48 0.04 −
K 80 − iso. 1.39 × 103 2 × 106 15 6.4 2.5 × 10−2 384 0.04 −
L 80 − iso. 1.39 × 103 2 × 106 15 1.0 2.5 × 10−2 48 0.04 −
M 80 − iso. 2.78 × 102 8.45 × 106 10 1.0 2.5 × 10−2 48 0.04 −
N 80 − iso. 2.78 × 102 1 × 107 15 6.4 2.5 × 10−2 48 0.04 −
O 80 − iso. 2.78 × 102 1 × 107 15 1.0 2.5 × 10−2 48 0.04 −
P 80 − fwd. 2.78 × 102 1 × 107 15 1.0 2.5 × 10−2 48 0.04 −
Q 80 − iso. 5.57 × 101 5 × 107 15 1.0 2.5 × 10−2 48 0.04 −
Jt 80 − iso. 1.39 × 103 2 × 106 15 6.4 2.5 × 10−2 48 0.04 2.8 × 10−5
Nt 80 − iso. 2.78 × 102 1 × 107 15 6.4 2.5 × 10−2 48 0.04 2.8 × 10−5
Ot 80 − iso. 2.78 × 102 1 × 107 15 1.0 2.5 × 10−2 48 0.04 2.8 × 10−5
R 6593.89 20 iso. 2.78 × 102 1 × 107 15 1.0 2.5 × 10−2 48 0.04 −
S 6593.89 20 fwd. 2.78 × 102 1 × 107 15 1.0 2.5 × 10−2 48 0.04 −
T 0 − − 2.78 × 102 1 × 107 15 1.0 2.5 × 10−2 − − −
U 80 − iso. 1.39 × 103 2 × 106 15 6.4 2.5 × 10−2 48 0.04 −
V 80 − iso. 2.78 × 102 1 × 107 15 6.4 2.5 × 10−2 48 0.04 −
W 80 − iso. 2.78 × 102 1 × 107 15 1.0 2.5 × 10−2 48 0.04 −
X 80 − fwd. 2.78 × 102 1 × 107 15 1.0 2.5 × 10−2 48 0.04 −
Y 6593.89 20 iso. 2.78 × 102 1 × 107 15 1.0 2.5 × 10−2 48 0.04 −
Z 6593.89 20 fwd. 2.78 × 102 1 × 107 15 1.0 2.5 × 10−2 48 0.04 −

Notes. The table gives the different simulation properties and parameters that we employ. The first column gives the simulation name with the colour as used in the figures. It follows the second column with the viscosity cross-section Eq. (A.1). The third column gives the velocity parameter of the velocity-dependent cross-section if applicable, in this case the second column corresponds to the normalisation of the cross-section, i.e. σ0 of Eq. (4). The fourth column gives the angular dependence (iso. – isotropic, fwd. – forward dominated). The fifth column specifies whether the halo is evolved in an external potential, and the following columns give the numerical particle mass, the number of particles, the cut radius for sampling the ICs, the gravitational softening length (ϵ), the gravitational time step parameter (η), the SIDM neighbour number Nngb, the SIDM time step parameter (τ), and the lower limit of the allowed time step (Δtmin). Moreover, the parameter for the tree node opening criterion is set to α = 5 × 10−4 for all simulations following Fischer et al. (2024a). The simulations above the dashed line are evolved in isolation, and the ones below in an external potential motivated by the Milky Way as described in Sect. 4.1. The data for the highest-resolved SIDM simulation (N = 5 × 107) is available at https://darkium.org.

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