Dr Louise Welsh

Recent publications — 2026

1. Towards a Measurement of the Primordial Helium Isotope Ratio
   Cooke, Ryan J., Johnson, James W., Noterdaeme, Pasquier, Pettini, Max, Welsh, Louise, et al.
   Jun 2026, The Astrophysical Journal, 1003, 225 (on-line)
2. One H<SUB>2</SUB> molecule per ten million H atoms reveals sub-parsec-scale cold overdensities at z ∼ 4
   Noterdaeme, P., Balashev, S., Berg, T., Cristiani, S., Cuellar, R., et al.
   Mar 2026, Astronomy and Astrophysics, 707, A66 (on-line)
3. E-XQR-30: evidence for an increase in the ionization state of metal absorbers from z ∼ 6 to z ∼ 2
   Rowlands, Stephanie, Davies, R. L., Ryan-Weber, E., Keating, L. C., Sebastian, A. M., et al.
   Feb 2026, Monthly Notices of the Royal Astronomical Society, 546, staf2254 (on-line)

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