Open Access
Table A.4
astroSABER keywords mentioned throughout the text.
| Symbol | Description | astroSABER keyword | Default |
|---|---|---|---|
| Essential parameters | |||
| Φ | Smoothing mode of the extraction (Sect. 2.2) | phase | ‘two’ |
| λ1 | If phase=‘two’ (=‘one’), smoothing parameter of the first major cycle iteration (all major cycle iterations) (Sect. 2.2) | laml | None |
| p1 | If phase=‘two’ (=‘one’), asymmetry weight of the first major cycle iteration (all major cycle iterations) (Sect. 2.2) | p1 | 0.9 |
| λ2 | Smoothing parameter of the remaining major cycle iterations (Sect. 2.2) | lam2 | None |
| p2 | Asymmetry weight of the remaining major cycle iterations (Sect. 2.2) | p2 | 0.9 |
| σrms | Observational noise of the data (Sect. 2.2) | noise | None |
| Advanced settings | |||
| ℛ+ | Option to add residual (= absolute difference between first and last major cycle iteration; Sect. 2.2) | add_residual | True |
| nmajor | Maximum number of major cycle iterations (Sect. 2.2) | niters | 20 |
| sthresh | Multiplying factor of the noise setting the convergence threshold (Sect. 2.2) | sig | 1.0 |
| nconverge | Number of iterations of the major cycle to determine convergence (Sect. 2.2) | iterations_for_convergence | 3 |
| ssignal | Significance of emission to be considered in the extraction (Sect. A.4) | check_signal_sigma | 6.0 |
| ΔυLSR | Velocity range of the spectrum containing significant emission (set by σsignal) to be considered in the baseline extraction (in units of km s−1) (Sect. A.4) | velo_range | 15.0 |
| Plimit | The probability threshold of the Markov chain to estimate signal ranges in the spectra (Sect. A.4) | p_limit | 0.01 |
| Optimization parameters | |||
| 𝒮prior | Option to apply prior asymmetric least squares smoothing to observations to generate test data (Sect. A.2) | smooth_testdata | True |
| Ntrain | Number of training spectra used for the optimization (Sect. A.1) | training_set_size | 100 |
| µamp | Mean of normal distribution to draw amplitude values from (in units of σrms; Sect. A.1) | mean_amp_snr | 7.0 |
| σamp | Standard deviation of normal distribution to draw amplitude values from (in units of σrms; Sect. A.1) | std_amp_snr | 1.0 |
| µmean | Mean of normal distribution to draw mean velocities from (Sect. A.1) | - | set by signal range |
| σmean | Standard deviation of normal distribution to draw mean velocities from (Sect. A.1) | - | set by signal range |
| µlw | Mean of normal distribution to draw line width (FWHM) values from (in units of km s−1; Sect. A.1) | mean_linewidth | None |
| σlw | Standard deviation of normal distribution to draw line width (FWHM) values from (in units of km s−1; Sect. A.1) | std_linewidth | None |
| µn | Mean of normal distribution to draw number of components from (Sect. A.1) | mean_ncomponent | 2.0 |
| σn | Standard deviation of normal distribution to draw number of components from (Sect. A.1) | std_ncomponent | 0.5 |
Notes. A full documentation of all parameters is given at https://github.com/astrojoni89/astrosaber.
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