Figure 2
From: The interaction between feedback from active galactic nuclei and supernovae
Top panel: Present-day star formation suppression factors as a function of halo mass for the simulations that include SN feedback (orange), AGN feedback (blue) and both types of feedback (red).Bottom panel: Amplification factor, χ (Eq. 1), as a function of halo mass. Each curve shows results for a different redshift, as indicated in the legend. Values of χ = 1 indicate that SN and AGN feedback operate independently of one another. Values χ < 1 indicate that SN and AGN feedback mutually suppress one another's effects. At low redshift, in haloes with masses 
, the two feedback effects weaken one another's impact on the SFR by almost an order of magnitude relative to the case in which they operate independently. The purple, dashed line in the bottom panel of this figure shows the suppression factor obtained from using SSN+AGN/SSN in haloes with 
and SSN+AGN/SAGN for more massive haloes. At all halo masses, this quantity remains within a factor of two of unity, demonstrating that using a sharp cutoff where only SN (AGN) feedback operates in low mass (high mass) haloes provides a reasonable approximation to our results.
