Radial dependence of the ratio of Fe II to Mg II equivalent widths in emission-line galaxies

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Volume 701 (September 2025)

A&A, 701 (2025) A1

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Table 1.

Measurements from composite spectra.

Bin	S_FeII	S_MgII	$W_{r}^{λ 2600}$ $W^{\lambda 2600}_{\mathrm{r}}$ [Å]	$W_{r}^{λ 2796}$ $W^{\lambda 2796}_{\mathrm{r}}$ [Å]	R	⟨z_ELG⟩	⟨log SFR⟩	$⟨ log \frac{M_{}}{M_{⊙}} ⟩$ $\langle\log\frac{M_{}}{M_{\odot}}\rangle$
a	0.72 ± 0.14	1.35 ± 0.20	0.959 ± 0.125	1.539 ± 0.144	0.62 ± 0.10	0.818	0.776	10.27
b	0.71 ± 0.23	1.37 ± 0.13	0.258 ± 0.057	0.803 ± 0.047	0.32 ± 0.07	0.826	0.850	10.27
c	1.74 ± 2.06	1.08 ± 0.17	0.037 ± 0.040	0.307 ± 0.034	0.12 ± 0.13	0.816	0.804	10.30
d	1.94 ± 4.32	1.05 ± 0.27	0.013 ± 0.027	0.145 ± 0.027	0.09 ± 0.18	0.821	0.819	10.28

Notes. (1) Different d_p bins groups, see Figure 2. (2) $S_{FeII} = W_{r}^{λ 2586} / W_{r}^{λ 2600}$ ${S\!}_{\mathrm{FeII}} = W^{\lambda2586}_{\mathrm{r}}/W^{\lambda2600}_{\mathrm{r}}$ . (3) $S_{MgII} = W_{r}^{λ 2796} / W_{r}^{λ 2803}$ ${S\!}_{\mathrm{MgII}} = W^{\lambda2796}_{\mathrm{r}}/W^{\lambda2803}_{\mathrm{r}}$ . (4) Equivalent widths of the Fe IIλ2600 absorption line. (5) Equivalent widths of the Mg IIλ2796 absorption line. (6) Ratio of the equivalent widths of the Fe IIλ2600 and Mg IIλ2796 absorption lines. (7) Median redshift of ELGs. (8) Median star formation rate for ELGs. (9) Median stellar mass of ELGs.

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