A compact group lens modeled with GIGA-Lens: Enhanced inference for complex systems

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Volume 694 (February 2025)

A&A, 694 (2025) A35

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Table 3

Lens model parameters and their uncertainties.

Halo					Shear		S2
θ_E (arcsec)	RA	Dec	ϕ (deg)	ε	γ₁	γ₂	η
${5.052}_{- 0.005}^{+ 0.005}$ $\[5.052_{-0.005}^{+0.005}\]$	2h48m10s	−39d55m48s	${12.1}_{- 0.2}^{+ 0.3}$ $\[12.1_{-0.2}^{+0.3}\]$	${0.203}_{- 0.002}^{+ 0.002}$ $\[0.203_{-0.002}^{+0.002}\]$	${0.003}_{- 0.001}^{+ 0.001}$ $\[0.003_{-0.001}^{+0.001}\]$	$- {0.015}_{- 0.001}^{+ 0.001}$ $\[-0.015_{-0.001}^{+0.001}\]$	${0.626}_{- 0.001}^{+ 0.001}$ $\[0.626_{-0.001}^{+0.001}\]$

Notes. The table presents median values and 1σ confidence intervals for the lens model parameters. These include the Einstein radius (θ_E), right ascension (RA), declination (Dec), position angle (ϕ), and ellipticity (ε); the external shear components (γ₁ and γ₂); and the distance ratio between sources S1 and S2 (η) as defined in Eq. (4). The parameters θ_E, γ₁, and γ₂ are relative to source S1 at redshift z = 1.2722.

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