Papers › Redshift Evolution of Galaxy Group X-ray Properties in Simba
Redshift Evolution of Galaxy Group X-ray Properties in Simba
Dylan Robson, Romeel Davé
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We examine the evolution of intragroup gas X-ray scaling relations for group-sized halos (M₅₀₀=10^(12.3-15)M_⊙) in the Simba galaxy formation simulation. X-ray luminosity L_X vs M₅₀₀ shows increasing deviation from self-similarity from z=3→0, with M₅₀₀<10^(13.5) M_⊙ halos exhibiting a large reduction in L_X and slight increase in X-ray luminosity-weighted temperature T_X. These shifts are driven by a strong drop in f_(gas) with time for these halos, and coincides with the onset of black hole jet feedback in these systems at z∼1.5 in Simba. The connection with black hole feedback is corroborated by f_(BH)≡M_(BH)/M₅₀₀ in M₅₀₀<10^(13.5) M_⊙ halos being strongly anti-correlated with L_X and f_(gas) at z⟨1.5. This is further reflected in the scatter of L_X-T_X: halos with small f_(BH) lie near self-similarity, while those with the highest f_(BH) lie furthest below. Turning off jet feedback results in mostly self-similar behaviour down to z=0. For the X-ray weighted metallicity Z_X, stellar feedback impacts the enrichment of halo gas. Finally, halo profiles show that jet feedback flattens the electron density and entropy profiles, and introduces a core in X-ray surface brightness particularly at M₅₀₀<10^(13.5) M_⊙. This argues that intragroup X-ray evolution is largely driven by jet feedback removing hot gas from the cores of massive groups, and expelling gas altogether in less massive groups.
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