Table 2.
Fit to the median stellar metallicity-stellar mass relations in Figs. 2 and 7.
| log Z*, r − log M* relation | ||||
|---|---|---|---|---|
| Sample |  |
A | B | ![Mathematical equation: $ \bar{M_\ast} [M_\odot] $](/articles/aa/full_html/2026/04/aa54981-25/aa54981-25-eq7.gif) |
| LEGA-C silver Q | 0.38 ± 0.04 | 0.6 ± 5 | 2 ± 3 | 1 ± 8 ⋅ 1010 |
| LEGA-C golden Q | 0.5 ± 0.1 | 0.5 ± 15 | 1 ± 11 | 1 ± 70 ⋅ 1010 |
| SDSS SN20 Q | 0.437 ± 0.002 | 0.4 ± 0.1 | 0.6 ± 0.1 | 1.0 ± 0.8 ⋅ 1010 |
| LEGA-C silver SF | 0.41 ± 0.09 | 0.9 ± 7.2 | 0.7 ± 3.9 | 1 ± 20 ⋅ 1010 |
| LEGA-C golden SF | 0.44 ± 0.01 | 1 ± 2 | 1 ± 0.9 | 0.9 ± 3.8 ⋅ 1010 |
| SDSS SN20 SF | 0.40 ± 0.01 | 0.6 ± 0.1 | 0.7 ± 0.2 | 1 ± 0.4 ⋅ 1010 |
Notes. Relations fit to the median stellar metallicity as a function of stellar mass for quiescent and star-forming galaxies using the functional form of Eq. (3), for the silver and golden LEGA-C samples displayed in the right panels of Fig. 2 and for SDSS DR7 spectra with S/N > 20 (SDSS SN20) displayed in the middle and right panels of Fig. 7. The columns list (1) the sample, (2) the characteristic parameter 
at 1011.5 M⊙, (3) the A parameter that regulates the metallicity increase over the inflection, (4) the B parameter that regulates the mass range of inflection, and (5) the characteristic mass 
of the inflection point. The trends for the silver sample are weighted for volume and completeness.
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