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Table 2.
Prior distribution for all parameters in the full spectral fitting.
| Parameter (Unit) | Prior distribution | Description |
|---|---|---|
| Age (Gyr) | Uniform(1, 14) | Age |
| [Z/H] | Uniform(−0.96, 0.4) | Total metallicity |
| [α/Fe] | Uniform(0, 0.4) | α-elements abundance |
| [Na/Fe] | Uniform(0, 0.6) | Sodium abundance |
| Γb | Uniform(0.3, 3.5) | Low-mass IMF slope |
| AV (mag) | Exponential(0.4) | Total extinction |
| RV | Normal+(3.1, 1) | Total-to-selective extinction |
| v* (km s−1) | Normal(3800, 100) | Stellar velocity recession |
| σ* (km s−1) | Uniform(100, 500) | Stellar velocity dispersion |
| αk (erg s−1 cm−2 Å−1) | HalfNormal(1) | Amplitude of the emission lines (k = 1, …, 7) |
| vgas (km s−1) | Normal(3800, 100) | Gas velocity recession |
| σgas (km s−1) | Uniform(60, 120) | Gas velocity dispersion |
| w0 (erg s−1 cm−2 Å−1) | Normal(1, 0.1) | Zero order polynomial weight |
| wn | Normal(0, 0.01) | Polynomial weight (n = 1, …, 30) |
| γm (erg s−1 cm−2 Å−1) | Normal(0, 1) | Amplitude for sky templates (m = 1, …, 14) |
| β | Normal(0, 1) | Exponent of multiplicative factor for uncertainties |
Notes. Fluxes are normalized to the median value of the observations.
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