Open Access
Table 1.
Tests presented in Sect. 5.
| Test | Ngal [106] | Failure rate [%] | Pixel scale [″] | Interpolation | Description | |
|---|---|---|---|---|---|---|
| D | E | D/E | kernel | |||
| I | 24.1 | 4.9 | 4.6 | 0.1 | quintic | HST/ACS and Euclid native pixel scales |
| I with Gauss. PSF | 24.1 | 4.4 | 4.1 | 0.1 | quintic | Similar to I, but with Gaussian PSF |
| I with 10 × S/NHST | 37.0 | 4.4 | 4.0 | 0.1 | quintic | Similar to I, but with higher S/NHST |
| Ic | 1.4 | 4.9 | 3.4 | 0.1 | lanczos15 | Similar to I, but with correction for noise correlation |
| Ic with σG = 2.5 | 8.9 | 4.9 | 3.4 | 0.1 | quintic | Testing sensitivity to noise scaling with σG = 2.5 |
| Ic with σG = 2.7 | 8.9 | 4.9 | 3.4 | 0.1 | quintic | Testing sensitivity to noise scaling with σG = 2.7 |
| Ic with PSF stack | 18.3 | 4.9 | 4.7 | 0.1 | lanczos15 | Similar to Test Ic, but with HST average star stack and average model stack PSFs |
| II | 33.8 | 5.9 | 6.4 | 0.04 | quintic | Similar to I but, testing finer pixel scale |
| III | 24.7 | 4.7 | 5.1 | 0.04 | quintic | Similar to Test II, but using HST PSFs with different centre positions and focus |
| III with rotat. | 24.7 | 4.7 | 5.1 | 0.04 | quintic | Similar to Test III, but adding ‘post-deconvolution isotropisation’ of HST images |
| IV with n = 1 | 77.0 | 5.6 | 5.8 | 0.04 | quintic | Similar to II but, testing the impact of Rtrunc for galaxies with n = 1 |
| IV with n = 2 | 77.0 | 2.2 | 2.2 | 0.04 | quintic | Similar to IV with n = 1, but for galaxies with n = 2 |
| IV with n = 3 | 77.0 | 1.6 | 1.5 | 0.04 | quintic | Similar to IV with n = 1, but for galaxies with n = 3 |
Notes. We report the number of galaxies Ngal for each S/N, the average failure rate of the KSB method over the four S/N levels, the pixel scales, the interpolation kernel used for both output images D and E, and a brief description of each test.
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