JWST spectroscopic confirmation of the Cosmic Gems arc at z = 9.625 - Insights into the small-scale structure of a post-burst system

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Volume 705 (January 2026)

A&A, 705 (2026) A173

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Table 1.

Updated main properties of the individual star clusters in the Cosmic Gems.

ID	μ_tot	μ_tan	R_eff	Age	log(M/M_⊙)	Av	Z/Z_⊙	Σ_M
			[pc]	[Myr]		[mag]	[%]	[10⁵ M_⊙ pc⁻²]
A.1	$47 . 9_{- 4.0}^{+ 4.0}$ $47.9^{+4.0}_{-4.0}$	$46 . 5_{- 4.3}^{+ 3.1}$ $46.5^{+3.1}_{-4.3}$	$1 . 1_{- 0.2}^{+ 0.7}$ $1.1^{+0.7}_{-0.2}$	$15_{- 9}^{+ 7}$ $15^{+7}_{-9}$	$6 . 79_{- 0.59}^{+ 0.15}$ $6.79^{+0.15}_{-0.59}$	$0 . 28_{- 0.15}^{+ 0.10}$ $0.28^{+0.10}_{-0.15}$	$5 . 8_{- 3.4}^{+ 2.7}$ $5.8^{+2.7}_{-3.4}$	$4 . 8_{- 3.6}^{+ 4.1}$ $4.8^{+4.1}_{-3.6}$
B.1	$92 . 3_{- 10.6}^{+ 11.7}$ $92.3^{+11.7}_{-10.6}$	$89 . 3_{- 10.9}^{+ 10.2}$ $89.3^{+10.2}_{-10.9}$	$1 . 1_{- 0.5}^{+ 0.1}$ $1.1^{+0.1}_{-0.5}$	$10_{- 3}^{+ 6}$ $10^{+6}_{-3}$	$6 . 35_{- 0.34}^{+ 0.23}$ $6.35^{+0.23}_{-0.34}$	$0 . 20_{- 0.13}^{+ 0.13}$ $0.20^{+0.13}_{-0.13}$	$2 . 6_{- 1.9}^{+ 4.0}$ $2.6^{+4.0}_{-1.9}$	$1 . 7_{- 1.2}^{+ 4.1}$ $1.7^{+4.1}_{-1.2}$
C.1	$124 . 5_{- 16.8}^{+ 19.7}$ $124.5^{+19.7}_{-16.8}$	$120 . 0_{- 16.8}^{+ 17.7}$ $120.0^{+17.7}_{-16.8}$	< 0.9	$7_{- 2}^{+ 5}$ $7^{+5}_{-2}$	$6 . 02_{- 0.35}^{+ 0.35}$ $6.02^{+0.35}_{-0.35}$	$0 . 35_{- 0.16}^{+ 0.10}$ $0.35^{+0.10}_{-0.16}$	$4 . 4_{- 2.4}^{+ 3.4}$ $4.4^{+3.4}_{-2.4}$	> 1.1
D.1	$166 . 6_{- 26.5}^{+ 31.7}$ $166.6^{+31.7}_{-26.5}$	$162 . 4_{- 27.5}^{+ 31.0}$ $162.4^{+31.0}_{-27.5}$	$0 . 7_{- 0.6}^{+ 0.1}$ $0.7^{+0.1}_{-0.6}$	$7_{- 3}^{+ 10}$ $7^{+10}_{-3}$	$5 . 89_{- 0.43}^{+ 0.44}$ $5.89^{+0.44}_{-0.43}$	$0 . 33_{- 0.17}^{+ 0.11}$ $0.33^{+0.11}_{-0.17}$	$5 . 2_{- 2.6}^{+ 3.1}$ $5.2^{+3.1}_{-2.6}$	$1 . 6_{- 1.2}^{+ 7.7}$ $1.6^{+7.7}_{-1.2}$
E.1	$323 . 5_{- 82.4}^{+ 125.5}$ $323.5^{+125.5}_{-82.4}$	$308 . 3_{- 76.3}^{+ 120.1}$ $308.3^{+120.1}_{-76.3}$	$0 . 4_{- 0.1}^{+ 0.2}$ $0.4^{+0.2}_{-0.1}$	$27_{- 9}^{+ 14}$ $27^{+14}_{-9}$	$5 . 97_{- 0.15}^{+ 0.13}$ $5.97^{+0.13}_{-0.15}$	$0 . 26_{- 0.18}^{+ 0.16}$ $0.26^{+0.16}_{-0.18}$	$4 . 7_{- 3.2}^{+ 3.5}$ $4.7^{+3.5}_{-3.2}$	$4 . 9_{- 2.2}^{+ 4.1}$ $4.9^{+4.1}_{-2.2}$
A.2	$52 . 2_{- 3.2}^{+ 4.4}$ $52.2^{+4.4}_{-3.2}$	$50 . 0_{- 3.6}^{+ 4.2}$ $50.0^{+4.2}_{-3.6}$	$1 . 7_{- 0.4}^{+ 0.8}$ $1.7^{+0.8}_{-0.4}$	$15_{- 5}^{+ 7}$ $15^{+7}_{-5}$	$6 . 49_{- 0.24}^{+ 0.16}$ $6.49^{+0.16}_{-0.24}$	$0 . 17_{- 0.10}^{+ 0.14}$ $0.17^{+0.14}_{-0.10}$	$4 . 3_{- 3.0}^{+ 3.2}$ $4.3^{+3.2}_{-3.0}$	$1 . 0_{- 0.5}^{+ 1.4}$ $1.0^{+1.4}_{-0.5}$
B.2	$90 . 3_{- 7.4}^{+ 7.3}$ $90.3^{+7.3}_{-7.4}$	$87 . 1_{- 7.6}^{+ 7.0}$ $87.1^{+7.0}_{-7.6}$	< 1.3	$8_{- 3}^{+ 5}$ $8^{+5}_{-3}$	$6 . 47_{- 0.38}^{+ 0.29}$ $6.47^{+0.29}_{-0.38}$	$0 . 30_{- 0.15}^{+ 0.13}$ $0.30^{+0.13}_{-0.15}$	$4 . 3_{- 2.3}^{+ 3.1}$ $4.3^{+3.1}_{-2.3}$	> 1.7
C.2 + D.2	$132 . 5_{- 14.4}^{+ 16.7}$ $132.5^{+16.7}_{-14.4}$	$126 . 5_{- 13.6}^{+ 17.2}$ $126.5^{+17.2}_{-13.6}$	$1 . 9_{- 1.8}^{+ 11.1}$ $1.9^{+11.1}_{-1.8}$	$17_{- 7}^{+ 7}$ $17^{+7}_{-7}$	$6 . 60_{- 0.23}^{+ 0.12}$ $6.60^{+0.12}_{-0.23}$	$0 . 20_{- 0.14}^{+ 0.15}$ $0.20^{+0.15}_{-0.14}$	$4 . 8_{- 3.1}^{+ 3.5}$ $4.8^{+3.5}_{-3.1}$	$1 . 0_{- 0.8}^{+ 6.5}$ $1.0^{+6.5}_{-0.8}$

Notes. Main updated properties of the five clusters (with their counterimages when detected) discussed in Adamo et al. (2024). Age, mass, extinction, and metallicity of the clusters were derived from broadband SED fitting performed with Bagpipes (details in the main text).

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