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Table 2.

Parameters of the foreground mass distribution inferred by LENSTOOL, for our best lensing model and the four alternative models.

Model rmsimg Component ΔRA ΔDec ϵ θ rcore rcut σ
(″) (″) (″) (deg) (kpc) (kpc) (km s−1)
Best 0.21 Large scale 39.9 ± 4.0 –20.3 ± 2.2 0.69 ± 0.07 –33 ± 1 142 ± 10 [500] 1081 ± 112
G4 [7.0] [–1.5] [0.1] [–43] [0.25] [70] 233 ± 14
L* galaxy ... ... ... ... [0.25] 59 ± 17 267 ± 17

Fixed center 0.64 Large scale [31.2] [–18.8] 0.73 ± 0.03 –31 ± 1 59 ± 5 [500] 759 ± 25
G4 [7.0] [–1.5] [0.1] [–43] [0.25] [70] 293 ± 9
L* galaxy ... ... ... ... [0.25] 40 ± 19 213 ± 30
Faint arcs 0.43 Large scale 28.6 ± 1.0 –14.4 ± 0.7 0.70 ± 0.09 32 ± 1 82 ± 12 [500] 851 ± 58
G4 [7.0] [–1.5] [0.1] [–43] [0.25] [70] 243 ± 9
L* galaxy ... ... ... ... [0.25] 63 ± 23 296 ± 28
Non-cored 0.34 Large scale 24.9 ± 0.5 –11.6 ± 0.5 0.64 ± 0.09 31 ± 2 [20] [500] 573 ± 26
G4 [7.0] [–1.5] [0.1] [–43] [0.25] [70] 284 ± 11
L* galaxy ... ... ... ... [0.25] 133 ± 29 301 ± 16
NFW 0.30 Large scale 37.8 ± 1.6 –20.1 ± 0.9 0.68 ± 0.05 –32.5 ± 0.6 3.4 ± 0.7 (1) 377 ± 53 (2) ...
G4 [7.0] [–1.5] [0.1] [–43] [0.25] [70] 253 ± 9
L* galaxy ... ... ... ... [0.25] 74 ± 21 296 ± 24

Notes. “Large scale” refers to the extended dark-matter halo associated with the lensing structure. Positional offsets are given in arcseconds relative to α = 11h27m16.6s and δ = +42°28′38.8″. The ellipticity of the mass distribution, ϵ, is given as (a2 − b2)/(a2 + b2). Parameters in brackets are fixed, and errors correspond to 1σ confidence intervals for the best-fit parameters. For the NFW model, (1) and (2) refer to the concentration parameter, c, and the scale radius, rs, respectively.

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