Table 2.
Average multiplicative and additive biases for galaxies with 20 < mAUTO < 24.5.
| Setup | μ1 | μ2 | c1 [×105] | c2 [×105] |
|---|---|---|---|---|
| Baseline | ||||
| SEXTRACTOR | −0.010 61 ± 0.000 13 | −0.010 53 ± 0.000 13 | −0.73 ± 0.51 | −0.73 ± 0.49 |
| SEXTRACTOR– no background | −0.010 43 ± 0.000 18 | −0.009 74 ± 0.000 18 | −0.68 ± 0.73 | 0.36 ± 0.71 |
| SEXTRACTOR– FLAG = 0 | −0.012 14 ± 0.000 23 | −0.011 78 ± 0.000 22 | −0.71 ± 0.93 | 0.70 ± 0.92 |
| KSB detection | −0.019 17 ± 0.000 23 | −0.018 72 ± 0.000 23 | −0.09 ± 0.88 | 1.17 ± 0.88 |
| KSB selection | −0.018 66 ± 0.000 22 | −0.018 19 ± 0.000 22 | −0.08 ± 0.86 | 1.12 ± 0.86 |
| KSB shapes | −0.089 15 ± 0.000 31 | −0.087 57 ± 0.000 32 | −3.34 ± 1.20 | 0.74 ± 1.21 |
| Sheared image | ||||
| SEXTRACTOR | −0.010 62 ± 0.000 19 | −0.010 43 ± 0.000 18 | −0.84 ± 0.71 | −0.18 ± 0.73 |
| KSB detection | −0.019 28 ± 0.000 22 | −0.019 01 ± 0.000 23 | −0.19 ± 0.88 | −1.18 ± 0.87 |
| KSB selection | −0.018 77 ± 0.000 22 | −0.018 47 ± 0.000 22 | −0.16 ± 0.86 | −1.18 ± 0.85 |
| KSB shapes | −0.088 79 ± 0.000 31 | −0.087 66 ± 0.000 33 | −2.14 ± 1.21 | −1.34 ± 1.22 |
| Grid | ||||
| SEXTRACTOR | −0.006 94 ± 0.000 24 | −0.006 97 ± 0.000 24 | −1.53 ± 0.9 | 0.85 ± 0.91 |
| KSB detection | −0.013 25 ± 0.000 28 | −0.012 57 ± 0.000 29 | −0.81 ± 1.15 | −2.83 ± 1.12 |
| KSB selection | −0.012 81 ± 0.000 27 | −0.012 09 ± 0.000 29 | −0.79 ± 1.11 | −2.77 ± 1.08 |
| KSB shapes | −0.053 57 ± 0.000 30 | −0.052 51 ± 0.000 32 | −1.14 ± 1.25 | −1.80 ± 1.25 |
Notes. In the ‘baseline’ case the galaxies are placed randomly and their images are sheared. For the ‘sheared image’ results the full scene is sheared instead, thus altering the positions. Galaxies are placed on a regular grid, about 9″ apart for the ‘grid’ results. The rows labelled ‘SEXTRACTOR’ report the detection bias. The biases for objects with a KSB shape measurement are labelled ‘KSB detection’, and as ‘KSB selection’ when the weighting scheme is included. The results using the actual KSB shape measurements are reported as ‘KSB shapes’. All the KSB measurements also include the SEXTRACTOR detection bias. The reported uncertainties may differ for similar setups, because fewer simulations were analysed.
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