MARTA: The connection between chemical enrichment, feedback, and dust in a Wolf-Rayet galaxy at z ∼ 2

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Volume 710 (June 2026)

A&A, 710 (2026) A18

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Table 1.

Physical properties of MARTA-4327.

Property	Value
MARTA ID	4327
RA	150.1152501
Dec	2.2419069
Redshift (z)	2.22344 ± 0.00007
log(M_★/M_⊙) (SED; total phot.)	9.36 ± 0.10
SFR [M_⊙ yr⁻¹] (Hα; in-slit)	7.28 ± 0.01
log(sSFR/yr⁻¹) (Hα; in-slit)	−8.50 ± 0.10

ISM properties
A_V	0.50 ± 0.03
E(B − V)	0.16 ± 0.01
A_V cov^†	1.53 $_{- 0.16}^{+ 0.15}$ $Mathematical equation: $ ^{+0.15}_{-0.16} $$
E(B − V)_cov^†	0.49 $_{- 0.05}^{+ 0.05}$ $Mathematical equation: $ ^{+0.05}_{-0.05} $$
f_cov^†	0.74 $_{- 0.01}^{+ 0.01}$ $Mathematical equation: $ ^{+0.01}_{-0.01} $$
T_e [O III] [K]	11430 $_{- 160}^{+ 150}$ $Mathematical equation: $ ^{+150}_{-160} $$
T_e [O II] [K]	12260 $_{- 520}^{+ 480}$ $Mathematical equation: $ ^{+480}_{-520} $$
T_e HeI [K]	9915 ± 3070
log(O⁺/H)	−4.38 $_{- 0.06}^{+ 0.07}$ $Mathematical equation: $ ^{+0.07}_{-0.06} $$
log(O⁺⁺/H)	−4.01 $_{- 0.02}^{+ 0.02}$ $Mathematical equation: $ ^{+0.02}_{-0.02} $$
12+log(O/H)	8.15 $_{- 0.02}^{+ 0.02}$ $Mathematical equation: $ ^{+0.02}_{-0.02} $$
O⁺⁺/(O⁺⁺+O⁺)	0.70 $_{- 0.04}^{+ 0.03}$ $Mathematical equation: $ ^{+0.03}_{-0.04} $$
He⁺/H⁺ (y⁺)	0.085 $_{- 0.002}^{+ 0.002}$ $Mathematical equation: $ ^{+0.002}_{-0.002} $$
log(N/O)	−1.14 $_{- 0.03}^{+ 0.03}$ $Mathematical equation: $ ^{+0.03}_{-0.03} $$
log(S/O)	−1.71 $_{- 0.01}^{+ 0.02}$ $Mathematical equation: $ ^{+0.02}_{-0.01} $$
log(Ne/O)	−0.51 $_{- 0.01}^{+ 0.01}$ $Mathematical equation: $ ^{+0.01}_{-0.01} $$
log(Ar/O)	−2.49 $_{- 0.02}^{+ 0.02}$ $Mathematical equation: $ ^{+0.02}_{-0.02} $$
log(Fe/O)_gas	−2.07 $_{- 0.07}^{+ 0.06}$ $Mathematical equation: $ ^{+0.06}_{-0.07} $$ ( $_{- 0.15}^{+ 0.14}$ $Mathematical equation: $ ^{+0.14}_{-0.15} $$ syst.^‡)
log(Fe/N)_gas	−0.93 $_{- 0.08}^{+ 0.07}$ $Mathematical equation: $ ^{+0.07}_{-0.08} $$ ( $_{- 0.15}^{+ 0.15}$ $Mathematical equation: $ ^{+0.15}_{-0.15} $$ syst.^‡)
Fe dust-to-total ratio	0.65 ± 0.13
log(Fe/O)_total	−1.61 $_{- 0.22}^{+ 0.22}$ $Mathematical equation: $ ^{+0.22}_{-0.22} $$
[O/Fe]	0.38 ± 0.22

Blue and red bump features
FWHM (He IIλ4686) [km s⁻¹]	1460 ± 170
EW₀ He IIλ4686 [Å]	4 ± 1
EW₀ [4605−4650] [Å]	2.4 ± 0.5
EW₀ [5780−5850] [Å]	6 ± 3
EW₀ [5730−5850] [Å]	12 ± 4

Notes. ^( † )Adopting the Reddy et al. (2025) formalism for non-unity covering fraction of dust.

^( ‡ )Including additional 20% relative uncertainty on the ICF(Fe⁺⁺/O⁺).

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