Weak lensing constraints on the stellar-to-halo mass relation of galaxy groups with simulation-informed scatter

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Volume 700 (August 2025)

A&A, 700 (2025) A202

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Table 3.

Free parameters in our baseline model for fitting stacked ESD profiles binned by group total stellar mass.

Parameter	Prior	Constraints	Best-fit values
f_c	[0.2, 3]	$0 . 88_{- 0.24}^{+ 0.57}$ $0.88_{-0.24}^{+0.57}$	1.38
A_p	[0.1, 5]	$2 . 19_{- 1.32}^{+ 1.44}$ $2.19_{-1.32}^{+1.44}$	1.16
p_off	[0, 1]	$0 . 34_{- 0.19}^{+ 0.18}$ $0.34_{-0.19}^{+0.18}$	0.50
ℛ_off	[0, 5]	$2 . 47_{- 0.92}^{+ 1.31}$ $2.47_{-0.92}^{+1.31}$	2.26

$σ_{log M_{⋆}^{grp}}$ $\sigma_{\log M_{\star}^{\mathrm{grp}}}$	[0.01, 1]	$0 . 14_{- 0.09}^{+ 0.11}$ $0.14_{-0.09}^{+0.11}$	0.09
A_s	[0, 5]	$2 . 36_{- 0.63}^{+ 0.60}$ $2.36_{-0.63}^{+0.60}$	2.72
α_s	[0, 5]	$1 . 02_{- 0.11}^{+ 0.11}$ $1.02_{-0.11}^{+0.11}$	1.04

Notes. Constraints are presented as the median of the marginalised posterior distributions, with 68% credible intervals. Best-fit values correspond to the parameter set that minimises the χ² value of the model fit.

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