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Table 3.
Summary of mass models fit to the point sources of J1721+8842.
| Mass model | Images fit | Nsources | Offset from F (″) |
 /d.o.f. |
γ′ | Source ΔR (″) |
|---|---|---|---|---|---|---|
| SIE | ABCD | 1 | 0.68 | 50 ≡ 151 / 3 | – | – |
| SIE + shear | ABCD | 1 | 0.15 | 0 ≡ 0 / 1 | – | – |
| SIE | ABCDEF | 2 | – | 50 ≡ 251 / 5 | – | 0.88 ± 0.01 |
| SIE + shear | ABCDEF | 2 | – | 1.1 ≡ 3.2 / 3 | – | 0.73 ± 0.01 |
| PEMD + shear | ABCDEF | 2 | – | 1.3 ≡ 2.7 / 2 | 1.84 ± 0.06 | 0.64 ± 0.04 |
| SIE + shear | ABCDEF | 1 | – | 778 ≡ 3890 / 5 | – | – |
Notes. For the models fitting only ABCD, we cast E back into the source plane, and find any further images in the image plane (always one extra), and provide this image’s distance from the measured position of F. γ′ is the power-law slope (
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