Mid-infrared diagnostics for identifying main-sequence galaxies in the local Universe

Open Access

Table 1.

Description, range, probability distribution function, and reference of each physical parameter used to produce the simulated sample of galaxies.

Description	Distribution	Distribution Variables
Metallicity (log₁₀Z/Z_⊙)¹	Normal	μ = −0.1, σ = 0.1
Ionization parameter (log₁₀U)²	Normal	μ = −3.0, σ = 0.1
PAH-to-dust mass fraction (q_PAH)³	Normal	μ = 3.35, σ = 1.2
Dust fraction exposure (γ)⁴	$f (x \| k, θ) = \frac{1}{Γ (k) θ^{k}} x^{k - 1} e^{- \frac{x}{θ}}$ $f(x\|k, \theta) = \frac{1}{\Gamma(k)\theta^k} x^{k-1} e^{-\frac{x}{\theta}}$	k = 0.97, θ = 4.12
Interstellar radiation field strength (U_min)[3]	$f (x \| k, θ) = \frac{1}{Γ (k) θ^{k}} x^{k - 1} e^{- \frac{x}{θ}}$ $f(x\|k, \theta) = \frac{1}{\Gamma(k)\theta^k} x^{k-1} e^{-\frac{x}{\theta}}$	k = 0.85, θ = 0.039

Notes. Reference for each distribution: 1. Curti et al. (2022), 2. Kewley et al. (2019), 3. Aniano et al. (2020), and 4. Draine et al. (2007).

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