Extend metal-free stellar-population model comparisons

Establish whether incorporating independent metal-free stellar-atmosphere and stellar-evolution models, particularly the publicly available Raiter et al. spectral-energy-distribution grid, changes the LATED selection boundaries and related predictions.

Background

The adopted LATED boundaries combine the Yggdrasil and Nakajima et al. cloudy grids, which differ in photoionisation code, IMF sampling, and nebular treatment but share the same underlying metal-free stellar atmospheres. The authors therefore identify a remaining model-dependence gap on the stellar side.

The Raiter et al. grid is described as the natural publicly available cross-check that would vary this axis, while other potentially relevant models are not publicly available. Testing it could determine whether the current selection envelope is robust to independent stellar-atmosphere assumptions.

References

Ingesting the \citet{Raiter2010A&A...523A..64R} SEDs, the one public grid that would vary that axis, is the natural further cross-check and is deferred to future work.

— LATED: Ly$α$-anchored photometric selection of candidate metal-free and extremely metal-poor star formation from the end of reionisation to cosmic noon  (2609.24588 - Li et al., 21 Sep 2026) in Section 5.2, “Dependence on the choice of Pop~III model”