Behind the dust veil: A panchromatic view of an optically dark galaxy at z = 4.82

Open Access

Table 2.

Fitted and inferred physical properties of XS55.

Parameter	Value

ID	XS55
RA, Dec [deg]	150.1002501, 2.4967382
z	4.8214 ± 0.0004
A_V [mag]	2.2 ± 0.3
M_* [10¹⁰ M_⊙]	5 ± 1
SFR_IR [M_⊙ yr⁻¹]	540 ± 180
L_X [10⁴⁴ erg s⁻¹]	> 5.4
L_IR [10¹² L_⊙]	5.4 ± 1.8
β_IR	2.0 ± 0.2
M_gas,[CI] [10¹¹ M_⊙]	1.8 ± 0.5
SFE [10⁻⁹ yr⁻¹]	3.0 ± 1.0

T_{dust, thick} [K]	$32 . 7_{- 1.9}^{+ 2.2}$ $32.7^{+2.2}_{-1.9}$
M_{dust, thick} [10⁹ M_⊙]	$1 . 7_{- 0.5}^{+ 0.6}$ $1.7^{+0.6}_{-0.5}$

T_dust, thin [K]	$28 . 0_{- 2.8}^{+ 3.3}$ $28.0^{+3.3}_{-2.8}$
M_dust, thin [10⁹ M_⊙]	$2 . 3_{- 0.8}^{+ 1.4}$ $2.3^{+1.4}_{-0.8}$

R_{eff, 3 mm} [kpc]	< 1.76 ^(*)
R_{maj, CO(5 − 4)} [kpc]	3.2 ± 1.1
R_{min, CO(5 − 4)} [kpc]	< 2.08 ^(*)
PA_{CO(5 − 4)} [deg]	28 ± 20

Notes.

^(*)

Size upper limit (2σ) calculated with Eq. (2) in Gómez-Guijarro et al. (2022).

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