Unveiling large-scale rotational motions in the intragroup medium at z ∼ 1 through gravitational-arc tomography

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Volume 709 (May 2026)

A&A, 709 (2026) A18

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Table 5.

Orientation-kinematic analysis of Mg II absorption.

Rotation	PA_gas^a,b	i_gas^a	z_sys^c	v_rot, gas^a,d	χ_ν²^e
centre	[°]	[°]		[km s⁻¹]
G1	$231_{- 2}^{+ 1}$ $Mathematical equation: $ 231^{+1}_{-2} $$	$42_{- 13}^{+ 10}$ $Mathematical equation: $ 42^{+10}_{-13} $$	1.16666	$150_{- 13}^{+ 36}$ $Mathematical equation: $ 150^{+36}_{-13} $$	0.711
G1+G2	$238_{- 1}^{+ 1}$ $Mathematical equation: $ 238^{+1}_{-1} $$	$40_{- 12}^{+ 13}$ $Mathematical equation: $ 40^{+13}_{-12} $$	1.16674	$151_{- 17}^{+ 45}$ $Mathematical equation: $ 151^{+45}_{-17} $$	0.713
G1→G3	$209_{- 2}^{+ 2}$ $Mathematical equation: $ 209^{+2}_{-2} $$	$57_{- 8}^{+ 5}$ $Mathematical equation: $ 57^{+5}_{-8} $$	1.16643	$134_{- 5}^{+ 7}$ $Mathematical equation: $ 134^{+7}_{-5} $$	0.734
G1→G5	$213_{- 2}^{+ 2}$ $Mathematical equation: $ 213^{+2}_{-2} $$	$52_{- 18}^{+ 7}$ $Mathematical equation: $ 52^{+7}_{-18} $$	1.16648	$131_{- 6}^{+ 29}$ $Mathematical equation: $ 131^{+29}_{-6} $$	0.729

Notes. ^aDelensed absorber plane. ^bPosition angle of the approaching semi-major axis (east of north). ^cMass-weighted mean redshift of the considered galaxies. ^dAssuming a rotation curve $v (r) = v_{rot, gas} \frac{2}{π} arctan (r / r_{t})$ $Mathematical equation: $ v(r) = v_{\mathrm{rot,gas}}\frac{2}{\pi}\arctan(r/r_{\mathrm{t}}) $$ . ^eReduced Chi-squared.

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