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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Table 1.

Two satellite LANs studied in this work and their main nebulae.

ID	RA	Dec	z^a	log(M_h)^b	R_vir^c	log(L_Lyα)	d_proj^d	T_int
				(M_⊙)	(kpc)	(erg s⁻¹)	(pkpc)	(h)
RO-1001	10:01:23.06	02:20:04.9	2.916	13.6 ± 0.2	269 ± 41	44.0	–	7.9
RO-1001-Sat	10:01:24.25	02:20:38.0	2.920	13.2 ± 0.3	197 ± 45	43.4	311	7.9

RO-0959	09:59:59.48	02:34:41.7	3.091	12.8 ± 0.3	139 ± 32	44.0	–	6.3
RO-0959-Sat	09:59:57.04	02:34:36.9	3.092	12.8 ± 0.3	139 ± 32	42.9	276	6.3

Notes.

^(a)

z was calculated from the flux-weighted peak in Lyα spectra integrated across each nebula.

^(b)

M_h (and also L_Lyα) from Daddi et al. (2022b) was used for the main nebulae, while the M_h of the satellites was estimated using the methods in Sillassen et al. (2024) (see Sect. 3.1.2).

^(c)

R_vir was derived from M_h using the M_h − R_vir relation in Goerdt et al. (2010).

^(d)

d_proj was measured between the two Lyα peaks in each pair of LANs.

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