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Table 1.

Free Parameters and their associated prior distribution functions in the Prospector physical model.

Parameter Description Prior distribution
z Redshift Uniform: LEGA-C spectroscopic redshift zspec ± 0.005
log(M⋆/M⊙) Total stellar mass formed Uniform: min = 7, max = 12
log(Z⋆/Z⊙) Stellar metallicity Uniform: min = −1.98, max = 0.2
SFR ratios Ratio of adjacent SFRs in the Student’s t-distribution with
Eight-bin nonparametric SFH, σ = 0.3 and ν = 2
Seven free parameters in total
τ ̂ dust , 2 $ \hat{\tau}_{\mathrm{dust, 2}} $ Diffuse dust optical depth Clipped normal: min = 0, max = 4, mean = 0.3, σ = 1
τ ̂ dust , 1 $ \hat{\tau}_{\mathrm{dust, 1}} $ Birth-cloud dust optical depth Clipped normal in ( τ ̂ dust , 1 / τ ̂ dust , 2 $ \hat{\tau}_{\mathrm{dust, 1}}/\hat{\tau}_{\mathrm{dust, 2}} $): min = 0, max = 4, mean = 0.3, σ = 1
n Slope of Kriek & Conroy (2013) dust law Uniform: min = −1, max = 0.4
Umin Minimum radiation field intensity Fixed at 1.0
γ Mass fraction of dust in high radiation intensity Fixed at 0.01
qPAH PAH fraction Uniform: min = 0.5, max = 7
log(Zgas/Z⊙) Gas-phase metallicity Uniform: min = −2, max = 0.5
log U Ionization parameter Uniform: min = −4, max = −1
σeline Marginalization over emission line amplitudes Uniform: min = 30, max = 300
cp Photometric calibration Uniform: min = 10−5, max = 0.5
cs Spectroscopic calibration Uniform: min = 10−5, max = 0.5
ν Spectral white noise Uniform: min = 1, max = 3

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