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 3.

Physical parameters of the two satellite nebulae derived from FIR-to-radio SEDs and X-ray data.

L_{AGN, IR} (erg s⁻¹)	≲7.6 × 10⁴⁴
L_{AGN, X, bol} (erg s⁻¹)	≲7.9 × 10⁴⁴
log(L_IR, total, L_⊙)	≲12.2
log(M_{dust, total}, M_⊙)	≲8.61
⟨U⟩_total^a	–

RO-1001-Sat

L_{AGN, IR} (erg s⁻¹)	≲4.8 × 10⁴⁵
L_{AGN, X, bol} (erg s⁻¹)	≲1.2 × 10⁴⁵
log(L_IR, total, L_⊙)	12.48 ± 0.08
log(M_{dust, total}, M_⊙)	8.91 ± 0.12
⟨U⟩_total	29.0 ± 11.4

RO-0959-Sat

Notes. The FIR-to-radio SEDs are shown in Fig. 7. L_{AGN, X, bol} was derived from X-ray data from the COSMOS Legacy survey (Civano et al. 2016; Marchesi et al. 2016) assuming the bolometric corrections from Lusso et al. (2012) for type-2 AGN.

^(a)

Mean interstellar radiation field intensity. ⟨U⟩_total is not reported for RO-1001-Sat as the SED fitting with only upper limits in IR is not constraining enough for a robust estimate.

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