Revealing the hidden cosmic feast: A z = 4.3 galaxy group hosting two optically dark, efficiently star-forming galaxies

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Volume 694 (February 2025)

A&A, 694 (2025) A218

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Table D.1.

Gas mass estimates for CGG-z4.a,b, and the products calculated from them.

ID	M_gas, thin	M_gas, thick	M_{gas, α_CO = 0.8}	M_{gas, α_CO = 3.8}	M_gas, CI
(1)	(2)	(3)	(4)	(5)	(6)
Gas mass	log([M_⊙])	log([M_⊙])	log([M_⊙])	log([M_⊙])	log([M_⊙])

CGG-z4.a	$11 . 29_{- 0.16}^{+ 0.12}$ $11.29^{+0.12}_{-0.16}$	$11 . 07_{- 0.24}^{+ 0.15}$ $11.07^{+0.15}_{-0.24}$	$10 . 51_{- 0.04}^{+ 0.04}$ $10.51^{+0.04}_{-0.04}$	$11 . 05_{- 0.04}^{+ 0.04}$ $11.05^{+0.04}_{-0.04}$	$11 . 14_{- 0.11}^{+ 0.09}$ $11.14^{+0.09}_{-0.11}$
CGG-z4.b	$10 . 99_{- 0.17}^{+ 0.12}$ $10.99^{+0.12}_{-0.17}$	$10 . 77_{- 0.24}^{+ 0.15}$ $10.77^{+0.15}_{-0.24}$	$10 . 28_{- 0.06}^{+ 0.05}$ $10.28^{+0.05}_{-0.06}$	$10 . 82_{- 0.06}^{+ 0.05}$ $10.82^{+0.05}_{-0.06}$	< 10.66

Gas mass ratio (M_gas/M_⋆)

CGG-z4.a	$1 . 7_{- 0.9}^{+ 3.6}$ $1.7^{+3.6}_{-0.9}$	$1 . 0_{- 0.6}^{+ 2.2}$ $1.0^{+2.2}_{-0.6}$	$0 . 3_{- 0.1}^{+ 0.6}$ $0.3^{+0.6}_{-0.1}$	$1 . 0_{- 0.5}^{+ 2.1}$ $1.0^{+2.1}_{-0.5}$	$1 . 2_{- 0.6}^{+ 2.5}$ $1.2^{+2.5}_{-0.6}$
CGG-z4.b	$1 . 7_{- 0.9}^{+ 3.4}$ $1.7^{+3.4}_{-0.9}$	$1 . 0_{- 0.6}^{+ 2.1}$ $1.0^{+2.1}_{-0.6}$	$0 . 3_{- 0.2}^{+ 0.6}$ $0.3^{+0.6}_{-0.2}$	$1 . 2_{- 0.6}^{+ 2.3}$ $1.2^{+2.3}_{-0.6}$	< 2.3

Gas depletion time (M_gas/SFR)	[Myr]	[Myr]	[Myr]	[Myr]	[Myr]

CGG-z4.a	$140_{- 44}^{+ 44}$ $140^{+44}_{-44}$	$84_{- 36}^{+ 36}$ $84^{+36}_{-36}$	$23_{- 2}^{+ 2}$ $23^{+2}_{-2}$	$80_{- 9}^{+ 9}$ $80^{+9}_{-9}$	$99_{- 23}^{+ 23}$ $99^{+23}_{-23}$
CGG-z4.b	$140_{- 46}^{+ 46}$ $140^{+46}_{-46}$	$84_{- 37}^{+ 37}$ $84^{+37}_{-37}$	$27_{- 4}^{+ 4}$ $27^{+4}_{-4}$	$94_{- 15}^{+ 15}$ $94^{+15}_{-15}$	< 69

Notes. Columns: (1) shows the name of the source and (2) gas mass using thin dust model; (3) gas mass using thick dust model; (4) gas mass using an α_CO numerical value of 0.8; (5) gas mass using an α_CO numerical value of 3.8 ± 0.1; (6) gas mass using an α_CI numerical value of 16.2 ± 0.4. Due to the large uncertainty on the stellar masses, the gas mass ratios are estimated through Monte Carlo sampling, generating 10⁶ samples and taking their median and 68% confidence interval.

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