Euclid preparation - LXXIII. Spatially resolved stellar populations of local galaxies with Euclid: A proof of concept using synthetic images with the TNG50 simulation

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Table 4.

The reliability of stellar population properties derived from SED fitting that applies the mass-Z-age prior.

	Data cube

	GALEX + LSST + Euclid		LSST + Euclid		Euclid-only

	BC16	FSPS	BC16	FSPS	BC16	FSPS
Σ_*

μ^a	0.05	0.02	0.05	0.01	0.05	0.01
σ^b	0.10	0.10	0.12	0.08	0.11	0.11
ρ^c	0.98	0.98	0.97	0.99	0.97	0.97

Σ_SFR

μ^a	0.06/−0.39	0.12/−0.37	1.87/−0.15	1.85/−0.16	2.03/−0.17	2.00/-0.19
σ^b	0.77/0.24	0.82/0.22	3.61/0.34	3.60/0.31	3.40/0.41	3.39/0.41
ρ^c	0.92/0.68	0.91/0.72	0.59/0.54	0.62/0.55	0.48/0.39	0.48/0.39

Age

μ^a	−0.06	−0.07	−0.10	−0.10	−0.11	−0.12
σ^b	0.09	0.09	0.09	0.09	0.10	0.10
ρ^c	0.42	0.43	0.62	0.63	0.46	0.47

Z

μ^a	−0.04	−0.01	−0.11	−0.12	−0.14	−0.16
σ^b	0.08	0.08	0.11	0.11	0.13	0.13
ρ^c	0.69	0.72	0.11	0.11	0.13	0.13

Notes.

Systematic offset defined as the mean of the logarithmic ratios between the parameter derived from SED fitting and the true value: log₁₀(fit/true).

The standard deviation of log₁₀(fit/true). ^c The Spearman rank-order correlation coefficient. For Σ_SFR, the values to the right of the slash symbol are calculated after applying a threshold of Σ_SFR > 10^−3.0 M_⊙ yr⁻¹ kpc⁻².

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