The effect of environment on the mass assembly history of the Milky Way and M31

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Table 2.

Mean and 16th and 84th percentiles of mass growth histories.

Selection	N	z₁₀	z₅₀	z₉₀
Milky Way	224	$3 . 7_{- 0.9}^{+ 0.9}$ $3.7^{+0.9}_{-0.9}$	$1 . 4_{- 0.4}^{+ 0.5}$ $1.4^{+0.5}_{-0.4}$	$0 . 3_{- 0.2}^{+ 0.1}$ $0.3^{+0.1}_{-0.2}$
w. LMC	28	$3 . 8_{- 1.0}^{+ 1.1}$ $3.8^{+1.1}_{-1.0}$	$1 . 3_{- 0.4}^{+ 0.3}$ $1.3^{+0.3}_{-0.4}$	$0 . 3_{- 0.1}^{+ 0.2}$ $0.3^{+0.2}_{-0.1}$
w. GES	72	$4 . 0_{- 0.9}^{+ 0.9}$ $4.0^{+0.9}_{-0.9}$	$1 . 5_{- 0.5}^{+ 0.5}$ $1.5^{+0.5}_{-0.5}$	$0 . 3_{- 0.1}^{+ 0.1}$ $0.3^{+0.1}_{-0.1}$
w. LMC+GES	12	$4 . 3_{- 0.9}^{+ 0.9}$ $4.3^{+0.9}_{-0.9}$	$1 . 4_{- 0.3}^{+ 0.3}$ $1.4^{+0.3}_{-0.3}$	$0 . 4_{- 0.1}^{+ 0.2}$ $0.4^{+0.2}_{-0.1}$
M31	224	$3 . 2_{- 0.7}^{+ 0.7}$ $3.2^{+0.7}_{-0.7}$	$1 . 2_{- 0.4}^{+ 0.4}$ $1.2^{+0.4}_{-0.4}$	$0 . 3_{- 0.2}^{+ 0.2}$ $0.3^{+0.2}_{-0.2}$
TNG-MW-mass	52	$3 . 1_{- 0.7}^{+ 0.6}$ $3.1^{+0.6}_{-0.7}$	$1 . 1_{- 0.6}^{+ 0.5}$ $1.1^{+0.5}_{-0.6}$	$0 . 3_{- 0.2}^{+ 0.2}$ $0.3^{+0.2}_{-0.2}$
TNG-M31-mass	53	$3 . 2_{- 0.8}^{+ 0.9}$ $3.2^{+0.9}_{-0.8}$	$1 . 1_{- 0.4}^{+ 0.4}$ $1.1^{+0.4}_{-0.4}$	$0 . 3_{- 0.2}^{+ 0.2}$ $0.3^{+0.2}_{-0.2}$

Notes. The number (N) of realisations (or objects) satisfying a certain selection criterion, and the redshifts at which 10%, 50%, 90% of their present-day M_200c values were attained.

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