Impact of line of sight structure on weak lensing observables of galaxy clusters

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Volume 703 (November 2025)

A&A, 703 (2025) A45

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Table 1.

Overview of our mock weak-lensing maps.

Designator	LoS	σ_ϵ	n(z_s)
CL	10 Mpc	0	$δ (z_{s} - {\tilde{z}}_{s})$ $\delta(z_{\mathrm{s}}-\tilde{z}_{\mathrm{s}})$
CL+LoS	< z_s	0	$δ (z_{s} - {\tilde{z}}_{s})$ $\delta(z_{\mathrm{s}}-\tilde{z}_{\mathrm{s}})$
CL+σ_ϵ	10 Mpc	0.26	$δ (z_{s} - {\tilde{z}}_{s})$ $\delta(z_{\mathrm{s}}-\tilde{z}_{\mathrm{s}})$
CL+LoS+σ_ϵ	< z_s	0.26	$δ (z_{s} - {\tilde{z}}_{s})$ $\delta(z_{\mathrm{s}}-\tilde{z}_{\mathrm{s}})$
Euclid+CL	10 Mpc	0.26	n_euclid(z_s)
Euclid+CL+LoS	< z_s	0.26	n_euclid(z_s)

Notes. The six different mocks used in this work. First, we have four single source plane mocks for various source plane redshifts $z_{s} = {\tilde{z}}_{s}$ $z_{\mathrm{s}}=\tilde{z}_{\mathrm{s}}$ , indicated by the Kronecker delta δ in the last column: (i) ‘CL’, isolates the intrinsic shortcomings of the modelling of the cluster’s mass density profile; (ii) ‘CL+LoS’, isolates the effects of structure along the full LoS; (iii) ‘CL+σ_ϵ’, isolates the effects of realistic shape noise; and (iv) ‘CL+LoS+σ_ϵ’, includes the combined effects of the full LoS and realistic shape noise. Then, we have two Euclid-like mocks (with a realistic source redshift distribution, n_euclid) ‘Euclid+CL’ and ‘Euclid+CL+LoS’, which include shape noise and differ in the inclusion of LoS structures.

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