Table 2.
Initial parameters and parameter bounds used for the three Gaussian functions during the spectral line fitting.
| Initial parameter value | Parameter bounds | |||||
|---|---|---|---|---|---|---|
| Component | A | μ0 | σλ | A | μ0 | σλ |
| Rotating comp. | 0.3 | μ* | σ* | 0.1 − 1.0 | μ*, l − μ*, u | σ*, l − σ*, u |
| Non-rotating comp. 1 | 0.5 | λ0 − 0.001 | 0.001 | 0.0 − 1.0 | λmin − λmax | 0.0 − 0.003 |
| Non-rotating comp. 2 | 0.0 | λ0 + 0.001 | 0.001 | 0.0 − 1.0 | λmin − λmax | 0.0 − 0.003 |
Notes. Amplitudes (A) are peak normalised; central wavelengths (μ) and line widths (σλ) have the same units [μm]. The initial values and bounds for μ and σλ of the rotating component are determined from the results of the pPXF fit on the stellar features in the corresponding spaxel (see Sect. 3.3 for a detailed explanation of our fitting approach). λ0 is the expected observed central wavelength of the emission lines computed using z = 0.02448. λmin and λmax define the spectral range considered in the fit.
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