X-ray and optical analysis of the distant merging double cluster SPT-CLJ2228-5828, its gas bridge, and its shock front

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Volume 694 (February 2025)

A&A, 694 (2025) A45

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Table 1.

X-ray and optical properties of the eastern and western galaxy clusters.

Cluster property	Eastern cluster	Western cluster
(1) RA	337.239°	337.171°
(2) Dec	−58.479°	−58.474°
(3) z_opt	0.771	0.768
(4) z_{X − ray}	$0 . 771_{- 0.012}^{+ 0.016}$ $0.771^{+0.016}_{-0.012}$	$0 . 756_{- 0.019}^{+ 0.019}$ $0.756^{+0.019}_{-0.019}$
(5) L_X, CI	1.11 ± 0.05	1.07 ± 0.05
(6) L_X, CE	0.67 ± 0.05	0.71 ± 0.05
(7) T_X, CI	$3 . 638_{- 0.351}^{+ 0.429}$ $3.638^{+0.429}_{-0.351}$	$3 . 841_{- 0.351}^{+ 0.355}$ $3.841^{+0.355}_{-0.351}$
(8) T_X, CE	$3 . 219_{- 0.497}^{+ 0.592}$ $3.219^{+0.592}_{-0.497}$	$3 . 405_{- 0.451}^{+ 0.538}$ $3.405^{+0.538}_{-0.451}$
(9) Z	$0 . 837_{- 0.372}^{+ 0.418}$ $0.837^{+0.418}_{-0.372}$	$0 . 764_{- 0.310}^{+ 0.359}$ $0.764^{+0.359}_{-0.310}$
(10) M_gas	1.76 ± 0.13	2.06 ± 0.15
(11) Y_X, CI	$6 . 40_{- 0.80}^{+ 0.92}$ $6.40^{+0.92}_{-0.80}$	$7 . 91_{- 0.93}^{+ 0.96}$ $7.91^{+0.96}_{-0.93}$
(12) Y_X, CE	$5 . 67_{- 1.01}^{+ 1.12}$ $5.67^{+1.12}_{-1.01}$	$7 . 01_{- 1.07}^{+ 1.23}$ $7.01^{+1.23}_{-1.07}$
(13) M_{500, Y_X}	2.10 ± 0.20	2.41 ± 0.22
(14) M_{200, Y_X}	3.06 ± 0.29	3.51 ± 0.32
(15) R₅₀₀	675 ± 22	711 ± 22
(16) R₂₀₀	1040 ± 34	1094 ± 34
(17) P₅₀₀	4.92 ± 0.33	5.42 ± 0.32
(18) K₅₀₀	451 ± 31	498 ± 30
(19) M_500, WL	$0 . 40_{- 0.34}^{+ 0.53}$ $0.40^{+0.53}_{-0.34}$	$2 . 21_{- 0.85}^{+ 0.86}$ $2.21^{+0.86}_{-0.85}$
(20) M_200, WL	$0 . 56_{- 0.49}^{+ 0.80}$ $0.56^{+0.80}_{-0.49}$	$3 . 26_{- 1.24}^{+ 1.25}$ $3.26^{+1.25}_{-1.24}$
(21) σ_vel	1042 ± 290	743 ± 335
(22) c_X	0.38	0.31

Notes. (1) Right Ascension J2000. (2) Declination J2000. (3) Optical spectroscopic redshift from Gemini galaxies. (4) X-ray spectroscopic redshift. (5) X-ray luminosity in the 0.5 − 2 keV band measured within < R₅₀₀ (core-included) in 10⁴⁴ erg s⁻¹ units. (6) Same as (5) but measured within (0.15 − 1) R₅₀₀. (7) ICM temperature measured within < R₅₀₀ (core-included) in keV units. (8) Same as (7) but measured within (0.15 − 1) R₅₀₀. (9) Metal abundance measured within < R₅₀₀ in Z_⊙ units. (10) Gas mass measured within < R₅₀₀ in (10¹³ M_⊙) units. (11) X-ray equivalent of the Compton-y parameter measured within < R₅₀₀ in 10¹³ M_⊙ keV units. (12) Same as (11) but measured within (0.15 − 1) R₅₀₀. (13) Total mass estimated within < R₅₀₀ in 10¹⁴ M_⊙ units using the Y_X, CE − M₅₀₀ relation of B19. (14) Total mass within < R₂₀₀ in 10¹⁴ M_⊙ units using the R₂₀₀ = 1.538 R₅₀₀ relation of Reiprich et al. (2013) and the determined R₅₀₀ value. (15) R₅₀₀ radius in kpc units. (16) R₂₀₀ radius in kpc units. (17) Characteristic pressure in 10⁻³ keV cm⁻³ units. (18) Characteristic entropy in keV cm² units. (19) Total mass measured within < R₅₀₀ in 10¹⁴ M_⊙ units from the WL data. (20) Same as in (19) but within < R₂₀₀. (21) Velocity dispersion measured in km s⁻¹ units. (22) X-ray concentration parameters.

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