Table 1.
Model parameters and their priors.
| Type | Parameter | Prior | Duplicated | Description |
|---|---|---|---|---|
| Cosmological | ωcdm | 𝒰(0.051, 0.255) | Yes | Reduced cold dark matter density |
| ωb | 𝒰(0.019, 0.026) | Yes | Reduced baryon density | |
| h | 𝒰(0.64, 0.82) | Yes | Reduced Hubble parameter | |
| ns | 𝒰(0.84, 1.1) | Yes | Spectral index of the primordial power spectrum | |
| S8 | 𝒰(0.5, 1.0) | Yes | Structure growth parameter | |
| Nuisance | log10TAGN | 𝒰(7.3, 8.3) | Yes | Baryon feedback parameter |
| AIA | 𝒩(5.74, CAIA, β) | No + red-blue split only | Amplitude of intrinsic galaxy alignments for red galaxies | |
| β | 𝒩(0.44, CAIA, β) | No | Slope of the mass scaling of intrinsic galaxy alignments | |
| log10Mi | 𝒩(μ, CM) | No | Mean halo mass of early-type galaxies per tomographic bin i | |
| δz, i | 𝒩(μ, Cz) | No + red-blue split only | Shift of the mean of the redshift distribution per tomographic bin i | |
Notes. The first two columns provide parameter names and types of the sampling parameters. The third column lists the adopted prior with uniform priors denoted by 𝒰 and Gaussian priors denoted by 𝒩. The fourth column indicates whether or not the parameter is duplicated in the split cosmological analysis. The fifth column provides a brief parameter description. The priors on AIA and β are centred at the mean of the posterior reported by Fortuna et al. (2025) including a correlated prior with correlation coefficient r = −0.59. The prior on Mi is inferred from halo mass measurements as discussed in appendix B in W25. The δz priors are centred at the mean of the shift of the redshift distribution and correlated through a covariance matrix estimated following the methodology of Wright et al. (2025a).
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