With arms wide open: A VLT/MUSE view of the mechanisms driving unwinding spiral arms in cluster galaxies

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Volume 710 (June 2026)

A&A, 710 (2026) A215

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Table 1.

Global properties of UG101, its companion UG101b, and UG103.

Property	UG101	UG101b	UG103
z	0.04548 ± 4.6 × 10⁻⁵	0.04871 ± 4.6 × 10⁻⁵	0.05387 ± 4.7 × 10⁻⁵
RA (ICRS)^a	13:27:16.67	13:27:14.61	13:27:03.41
Dec (ICRS)	–31:49:14.67	–31:49:24.24	–31:13:31.49
z_cl^b	0.04829	0.04829	0.04829
σ_cl [km s⁻¹]	$910_{- 46}^{+ 44}$ $Mathematical equation: $ 910^{+44}_{-46} $$	$910_{- 46}^{+ 44}$ $Mathematical equation: $ 910^{+44}_{-46} $$	$910_{- 46}^{+ 44}$ $Mathematical equation: $ 910^{+44}_{-46} $$
log(M_★/M_⊙)	$9 . 94_{- 0.08}^{+ 0.05}$ $Mathematical equation: $ 9.94^{+0.05}_{-0.08} $$	$9 . 90_{- 0.06}^{+ 0.03}$ $Mathematical equation: $ 9.90^{+0.03}_{-0.06} $$	$10 . 80_{- 0.04}^{+ 0.04}$ $Mathematical equation: $ 10.80^{+0.04}_{-0.04} $$
SFR [M_⊙/yr]^c	0.77 ± 0.08	(9.1 ± 0.9)×10⁻³	2.4 ± 0.2
R_e [kpc]	5.2 ± 0.4	1.75 ± 0.07	8.9 ± 0.6
PA [°]	90.8 ± 2.1	39.8 ± 0.6	160.0 ± 1.4
i [°]	42.5 ± 1.1	41.7 ± 0.3	34.4 ± 1.2

Notes. For a description of how each property has been derived, see Sect. 5.

Coordinates of galaxy center, determined in this work (see Sect. 3.6.2).

Properties of Abell 3558, the cluster to which all galaxies belong, are from Biviano et al. (2017).

For UG101b, the reported SFR is not corrected for dust attenuation, given that Hβ emission is not detected in this galaxy.

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