Table 2.
Comparison of one-sigma statistical error of the distance modulus for different methods from the NASA/IPAC Extragalactic Database with three cases considered in our work: the ANN regression using all attributes and without radial velocity, and using direct conversation radial velocity to m−M according to Eqs. (1)–(3).
| Method | N | Error, mag |
|---|---|---|
| Primary methods | ||
| TRGB | 475 | 0.05 |
| Cepheids | 87 | 0.08 |
| PNLF | 72 | 0.12 |
| GC radius | 107 | 0.13 |
| HII region diameter | 44 | 0.13 |
| SNIa | 3179 | 0.14 |
| SNIa SDSS | 1771 | 0.16 |
| SNII optical | 184 | 0.17 |
| SBF | 539 | 0.18 |
| AGN time lag | 20 | 0.18 |
| GCLF | 213 | 0.18 |
| Masers | 10 | 0.22 |
| BCG | 239 | 0.35 |
| Secondary methods | ||
| Sosies | 344 | 0.20 |
| Tertiary | 283 | 0.30 |
| D-Sigma | 566 | 0.33 |
| ANN regr. (all attributes) | 393 359 | 0.35 |
| TF | 12 244 | 0.38 |
| Conv. VLG to m−M | 120 9871 | 0.40 |
| FP | 129 038 | 0.42 |
| ANN regr. (without VLG) | 436 140 | 0.44 |
Notes. Errors are only for the S0.50 sample ranked in ascending order separately for primary and secondary methods. The column N represents the number of galaxies for which distance modulus was defined by a given method from Steer et al. (2017). For the ANN regression and conversion of VLG to m−M models we give the number of galaxies for which it is possible to compute distance modulus using the corresponding method.
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