Speaker
Description
Diffuse X-ray emission from hot intracluster gas and emission from active galactic nuclei (AGN) provide complementary tracers of large-scale structure, encoding rich information about baryonic feedback, black hole and galaxy formation, and cosmology. These observables are particularly promising for cross-correlation studies with upcoming wide-field X-ray surveys.
We present a simulation-based framework to model a suite of X-ray observables. First, we introduce a baryonification-based model for stacked X-ray surface brightness profiles. Applying this model to XMM-Newton CHEX-MATE clusters and eROSITA eFEDS groups, we obtain consistent fits across multiple mass and redshift bins and derive constraints on the strength of baryonic feedback. We then extend this framework to generate diffuse X-ray emission maps from baryonified
$N$-body lightcones.
Finally, we introduce a simulation-based model for X-ray AGN emission based on subhalo abundance matching. Together, these components provide a promising basis for forward-modelling and cross-correlation analyses of upcoming wide-field X-ray surveys such as eROSITA.