Ly-alpha emission reveals two satellite halos around massive groups at z ∼ 3: The puzzling case of a quiescent central galaxy

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Volume 704 (December 2025)

A&A, 704 (2025) A340

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Table 2.

Candidate member galaxies identified from COSMOS2020 within the estimated virial radii of (a) RO-1001-Sat, and (b) RO-0959-Sat.

ID	RA	Dec	z_phot	log(M_*) (M_⊙)	SFR (M_⊙ yr⁻¹)	d_Lyα^a (″)
976566	150.3509872	2.3438518	$2 . 91_{- 0.44}^{+ 0.08}$ $2.91^{+0.08}_{-0.44}$	$11 . 3_{- 0.0}^{+ 0.2}$ $11.3^{+0.2}_{-0.0}$	$1_{- 0}^{+ 6}$ $1^{+6}_{-0}$	0.2
973711	150.3504033	2.3423635	$3 . 15_{- 0.23}^{+ 0.67}$ $3.15^{+0.67}_{-0.23}$	$10 . 1_{- 0.2}^{+ 0.1}$ $10.1^{+0.1}_{-0.2}$	$33_{- 25}^{+ 17}$ $33^{+17}_{-25}$	5.9
974107	150.3498499	2.3427528	$3 . 20_{- 0.22}^{+ 0.24}$ $3.20^{+0.24}_{-0.22}$	$9 . 6_{- 0.1}^{+ 0.1}$ $9.6^{+0.1}_{-0.1}$	$9_{- 3}^{+ 3}$ $9^{+3}_{-3}$	5.9
977626	150.3508365	2.3455787	$2 . 93_{- 0.13}^{+ 0.10}$ $2.93^{+0.10}_{-0.13}$	$9 . 5_{- 0.1}^{+ 0.1}$ $9.5^{+0.1}_{-0.1}$	$5_{- 1}^{+ 1}$ $5^{+1}_{-1}$	6.1
973892	150.3505759	2.3420574	$2 . 97_{- 0.09}^{+ 0.11}$ $2.97^{+0.11}_{-0.09}$	$9 . 6_{- 0.1}^{+ 0.1}$ $9.6^{+0.1}_{-0.1}$	$16_{- 12}^{+ 7}$ $16^{+7}_{-12}$	6.8
975257	150.3491109	2.3437248	$3 . 08_{- 0.25}^{+ 0.24}$ $3.08^{+0.24}_{-0.25}$	$9 . 7_{- 0.1}^{+ 0.1}$ $9.7^{+0.1}_{-0.1}$	$8_{- 2}^{+ 3}$ $8^{+3}_{-2}$	6.9
976011	150.3533100	2.3437876	$2 . 896_{- 0.002}^{+ 0.002}$ $2.896^{+0.002}_{-0.002}$ ^b	$9 . 7_{- 0.1}^{+ 0.1}$ $9.7^{+0.1}_{-0.1}$	$56_{- 11}^{+ 11}$ $56^{+11}_{-11}$	8.2
979058	150.3514126	2.3467909	$3 . 22_{- 0.12}^{+ 0.12}$ $3.22^{+0.12}_{-0.12}$	$9 . 9_{- 0.1}^{+ 0.1}$ $9.9^{+0.1}_{-0.1}$	$20_{- 5}^{+ 4}$ $20^{+4}_{-5}$	10.5
971930	150.3521540	2.3404616	$3 . 18_{- 0.12}^{+ 0.14}$ $3.18^{+0.14}_{-0.12}$	$10 . 3_{- 0.1}^{+ 0.1}$ $10.3^{+0.1}_{-0.1}$	$22_{- 7}^{+ 17}$ $22^{+17}_{-7}$	13.0
981015	150.3491015	2.3489236	$2 . 84_{- 0.40}^{+ 0.46}$ $2.84^{+0.46}_{-0.40}$	$10 . 1_{- 0.2}^{+ 0.1}$ $10.1^{+0.1}_{-0.2}$	$24_{- 13}^{+ 18}$ $24^{+18}_{-13}$	19.4
970048	150.3527952	2.3386652	$2 . 69_{- 0.06}^{+ 0.09}$ $2.69^{+0.09}_{-0.06}$	$9 . 8_{- 0.1}^{+ 0.1}$ $9.8^{+0.1}_{-0.1}$	$14_{- 3}^{+ 13}$ $14^{+13}_{-3}$	19.9
981411	150.3485605	2.3490356	$2 . 81_{- 0.16}^{+ 0.18}$ $2.81^{+0.18}_{-0.16}$	$9 . 7_{- 0.2}^{+ 0.1}$ $9.7^{+0.1}_{-0.2}$	$13_{- 3}^{+ 11}$ $13^{+11}_{-3}$	20.5

(a)
ID	RA	Dec	z_phot	log(M_*) (M_⊙)	SFR (M_⊙ yr⁻¹)	d_Lyα (″)

1220803	149.9876525	2.5771193	3.091^c	$11 . 2_{- 0.1}^{+ 0.1}$ $11.2^{+0.1}_{-0.1}$	$175_{- 142}^{+ 42}$ $175^{+42}_{-142}$	0.7
1219049	149.9844740	2.5765188	$3 . 21_{- 0.09}^{+ 0.10}$ $3.21^{+0.10}_{-0.09}$	$9 . 9_{- 0.1}^{+ 0.1}$ $9.9^{+0.1}_{-0.1}$	$23_{- 9}^{+ 5}$ $23^{+5}_{-9}$	11.6

Notes.

^(a)

Distance to the peak of the LAN.

^(b)

The redshift of this galaxy has been spectroscopically confirmed from its MUSE spectrum.

^(c)

The redshift of this galaxy has been spectroscopically confirmed by the detection of CO(3-2) from ALMA observations.

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