SHAM through the lens of a hydrodynamical simulation

Understand

We use the IllustrisTNG100 hydrodynamical simulation to study the dependence of the galaxy two-point correlation function on a broad range of secondary subhalo and galactic properties.

• We construct galaxy mock catalogues adopting a standard sub-halo abundance matching scheme coupled with a secondary assignment between galaxy colour or specific star formation rate and the following subhalo properties: starvation redshift z$_{\rm starve}$, concentration at infall, overdensity $\delta_R^{\rm env}$, tidal anisotropy $\alpha_R$, and tidal overdensity $\delta_R$.
• The last two quantities allow us to fully characterise the tidal field of our subhaloes, acting as mediators between their internal and large-scale properties.
• The resulting mock catalogues overall return good agreement with the IllustrisTNG100 measurements.