LEGA-C stellar population scaling relations - II. Dissecting mass-complete archaeological trends and their evolution since z ∼ 0.7 with LEGA-C and SDSS

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Volume 708 (April 2026)

A&A, 708 (2026) A290

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Table 3.

Fit to the median age and metallicity as a function of stellar mass for the general population.

Parameter	Sample	$\bar{P}$ $Mathematical equation: $ \bar{P} $$	A	B	$\bar{M_{*}} [M_{⊙}]$ $Mathematical equation: $ \bar{M_\ast}\,[M_\odot] $$
log⟨Age/yr⟩_r	LEGA-C silver	9.62 ± 0.04	0.3 ± 0.1	2 ± 1	1.2 ± 0.4 ⋅ 10¹¹
	LEGA-C golden	9.66 ± 0.02	0.30 ± 0.02	2.4 ± 0.3	1.07 ± 0.09 ⋅ 10¹¹

	SDSS-SN10	9.782 ± 0.002	0.289 ± 0.005	1.28 ± 0.04	6.5 ± 0.2 ⋅ 10¹⁰

log⟨Z_*/Z_⊙⟩_r	LEGA-C silver	0.37 ± 0.04	0.8 ± 1.4	1.6 ± 1.3	1 ± 2 ⋅ 10¹⁰
	LEGA-C golden	0.46 ± 0.01	1.0 ± 1.7	1.2 ± 0.6	0.9 ± 2 ⋅ 10¹⁰

	SDSS-SN20	0.435 ± 0.004	0.46 ± 0.08	0.8 ± 0.1	1.0 ± 0.4 ⋅ 10¹⁰

Notes. Relations fit to the median age and metallicity as a function of stellar mass using the functional form of Eq. (3) for the silver and golden LEGA-C samples as well as for SDSS DR7 (with S/N > 10 and S/N > 20 for age and metallicity, respectively) displayed in the left panels of Figs. 5 and 7. The columns list (1) the parameter, (2) the sample, (3) the characteristic parameter $\bar{P}$ $Mathematical equation: $ \bar{P} $$ at 10^11.5 M_⊙, (4) the A parameter that regulate the age/metallicity increase over the inflection, (5) the B parameter that regulates the mass range of inflection, and (6) the characteristic mass $\bar{M_{*}}$ $Mathematical equation: $ \bar{M_\ast} $$ of the inflection point.

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