Table A.1.
Description of the characteristics of the six developed lens models of MACS J0138 with the parametric pipeline Lenstool.
| Model | Nmass param | ν | χ2 | rms [″] | logℒ | logE | BIC | AIC |
|---|---|---|---|---|---|---|---|---|
| reference | 20 | 10 | 24.3 | 0.36 | 26.3 | −70.4 | 85.3 | 19.4 |
| circularBCGout | 22 | 8 | 19.5 | 0.31 | 28.7 | −64.8 | 88.1 | 18.6 |
| ellipticalBCGout | 24 | 6 | 10.7 | 0.22 | 33.1 | −56.2 | 87.0 | 13.8 |
| reference-noFG | 18 | 12 | 90.0 | 0.39 | −6.6 | −96.4 | 143.4 | 81.2 |
| reference-subs | 21 | 9 | 9.8 | 0.35 | 14.9 | −80.6 | 111.9 | 44.2 |
| subs-noES | 19 | 11 | 15.1 | 0.41 | 12.3 | −46.3 | 109.4 | 45.4 |
Notes. We list the number of model free mass parameters (Nmass param), where Nparam = Nmass param + 2 × Nfam, the resulting degrees of freedom (ν), and the values of the different statistical estimators used, as described in Sect. 3. We note that the reported χ2 value corresponds to the the minimum χ2 before rescaling the positional uncertainties of the multiple images. The first four lens models were created during the blind comparison challenge described by Suyu et al. (in prep.) while the two last ones were developed after the unblinding with the other lens modelling teams.
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