Dark Matter Halos from the Inside Out

Figure 1

Distribution of parameters describing the mass accretion histories of 1000 randomly generated merger trees. (a) Colors correspond to the classes defined by McBride et al. in [18]: blue: class I, yellow: class II, orange: class III, red: class IV. (b) colors correspond to the formation redshift 𝑧₅₀: magenta: 𝑧₅₀<0.3, blue: 𝑧₅₀=0.3−0.5, green: 𝑧₅₀=0.5−0.8, yellow: 𝑧₅₀=0.8−1.1, red: 𝑧₅₀> 1.1. The dotted line indicates the locus of trajectories with 𝛾−𝛽=0. For 𝛽≳1, formation redshift is roughly constant along this lines parallel to this one.

(a)

(b)