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Table 7.

Power law DM halo model: best-fit and marginalized parameter values for the mass model based on our image positions shown in Fig. 6 and the stellar kinematic data vrms,  sym given in Table 4.

With radial arc Without radial arc

Component Parameter Best-fit Marginalized Best-fit Marginalized
Kinematics β 0.00 −0.02
i 0.15 0.3

Dark matter q 0.91 0.90
(power law) θE [″] 1.69 1.7
rc [″] ≡10−4 ≡10−4
γ 1.28 1.26

Shear γext 0.077 0.08
ϕext [rad] 2.81 2.8

Baryonic matter M/L [M/L] 1.8 1.7
log(θE,  point) −1.01 −2.0

Radial arc θE [″] 0.6

Notes. The parameters are the anisotropy β, inclination i, axis ratio q, strength θE, core radius rc, slope γ′, shear magnitude γext, and shear orientation ϕext. Additionally, we give the mass-to-light ratio M/L, and the strength of the point mass θE,  point in logarithmic scale (i.e., −1 corresponds to around 1010M).

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