LEGA-C stellar population scaling relations - I. Chemo-archaeological downsizing trends at z ∼ 0.7

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Volume 708 (April 2026)

A&A, 708 (2026) A289

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Table 4.

Relations fit to the median age and metallicity as a function of stellar mass for the silver and golden samples using the functional form of Eq. (1), and shown in Fig. 8.

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 ± 0.08 ⋅ 10¹¹

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

Notes. (1) parameter of y-axis; (2) galaxy sample, (3) Characteristic parameter $\bar{P}$ $Mathematical equation: $ \bar{P} $$ at 10^11.5 M_⊙; (2) “A” parameter, which regulates the increase in age or metallicity over the inflection; (4) “B” parameter, which regulates the mass range of inflection; (5) characteristic mass $\bar{M_{*}}$ $Mathematical equation: $ \bar{M_\ast} $$ of the inflection point.

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