Disentangling Galaxy Bias in Cross-Correlation Tomography - Sarah Maleubre Molinero
When: Friday, February 20, 2026, 2:30 PM - 3:30 PM
Where: G. O. Jones, Room 610, Mile End
Speaker: Sara Maleubre Molinero (University of Oxford)
Title: Disentangling Galaxy Bias in Cross-Correlation Tomography
Abstract: How do we reconstruct the Universe’s thermal and star-forming history without being fooled by galaxy bias? Using the FLAMINGO hydrodynamic simulations, we show that cross-correlation tomography can be made robust against small-scale clustering effects. We build estimators for the halo bias-weighted electron pressure ⟨bPe⟩ and star-formation density ⟨bρSFR⟩—quantities accessible through tomographic analyses of the SZ and CIB signals—and demonstrate 1–3% accuracy across redshift and sample type. This work opens the way to unbiased reconstructions of cosmic evolution from current and future large-scale surveys.