Deriving the star formation histories of galaxies from spectra with simulation-based inference

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Volume 689 (September 2024)

A&A, 689 (2024) A58

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Table 1.

Inferred properties for 18 stacks of ETGs.

σ [km s⁻¹]	M10% [Gyr]	M50% [Gyr]	M90% [Gyr]	[M/H]
100–110	0.42 ± 0.22	1.21 ± 0.34	2.89 ± 0.63	0.11 ± 0.24
110–120	0.36 ± 0.22	1.12 ± 0.32	2.63 ± 0.66	0.13 ± 0.23
120–130	0.32 ± 0.21	0.95 ± 0.33	2.21 ± 0.75	−0.05 ± 0.32
130–140	0.23 ± 0.17	0.72 ± 0.29	1.66 ± 0.70	−0.12 ± 0.40
140–150	0.16 ± 0.13	0.63 ± 0.24	1.43 ± 0.57	0.06 ± 0.38
150–160	0.17 ± 0.13	0.61 ± 0.25	1.31 ± 0.61	−0.05 ± 0.39
160–170	0.15 ± 0.12	0.59 ± 0.21	1.18 ± 0.54	0.01 ± 0.40
170–180	0.15 ± 0.11	0.60 ± 0.21	1.11 ± 0.53	−0.05 ± 0.40
180–190	0.13 ± 0.10	0.59 ± 0.20	1.08 ± 0.50	−0.07 ± 0.41
190–200	0.13 ± 0.09	0.62 ± 0.18	1.04 ± 0.46	0.01 ± 0.37
200–210	0.13 ± 0.11	0.63 ± 0.16	1.02 ± 0.41	−0.03 ± 0.39
210–220	0.13 ± 0.10	0.64 ± 0.17	1.02 ± 0.44	−0.04 ± 0.37
220–230	0.12 ± 0.09	0.65 ± 0.15	1.02 ± 0.42	−0.07 ± 0.37
230–240	0.12 ± 0.12	0.67 ± 0.14	1.06 ± 0.39	0.07 ± 0.37
240–250	0.12 ± 0.07	0.66 ± 0.12	1.02 ± 0.39	0.03 ± 0.38
250–260	0.12 ± 0.07	0.69 ± 0.11	0.96 ± 0.36	0.05 ± 0.39
260–280	0.12 ± 0.06	0.69 ± 0.12	0.99 ± 0.41	−0.15 ± 0.38
280–320	0.12 ± 0.07	0.66 ± 0.11	1.02 ± 0.37	0.11 ± 0.34

Notes. We include the cosmic time in Gyr at which 10%, 50%, and 90% of the total stellar mass are formed, as well as the metallicity [M/H]. The values shown correspond to the median values of the predicted posterior distributions, and the uncertainties to the standard deviations.

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