Gaia Data Release 3
Open Access

Table 1.

Input data, models, training data, data products, and dependencies of the Apsis algorithms.

Module Category Object Input data
Inference model
Number G
type Non-Apsis Apsis Models Empirical (millions)
DSC Probabilities, SEB XP, ϖ, ExtraTrees/ 1591 < 21
Classification pm, G Gauss.Mix
OA Classification O XP (DSC) SOM 56 < 21
UGC Galaxy redshift E XP (DSC) SVM 2 < 21
QSOC Quasar redshift E XP (DSC) 6 < 21
GSP-Phot Spectroscopic, SI XP, ϖ, G MARCS/PHOENIX 470 < 19
Interstellar, evolution GBP,GRP OB/A/PARSEC
GSP-Spec Spectroscopic, SI RVS MARCS 6 < 16
Abundances, DIB
MSC Spectroscopic, BI XP ExtraTrees 350 < 18.3
Interstellar (GSP-Phot)
ESP-ELS Probabilities, S XP, RVS, GSP-Phot Random 0.01 < 17.65
Classification, ϖ, G Forest
Hα pEW 235
ESP-HS Spectroscopic S XP, RVS, ESP-ELS A/OB 2 < 17.6
ϖ, G
ESP-CS Spectroscopic S RVS (GSP-Spec) MARCS 2 < 15
ESP-UCD Spectroscopic S RP, ϖ, G Gauss.Proc. 0.1 < 21
FLAME Evolution S ϖ, G GSP-Phot MARCS/BaSTI 280 < 18.3
GSP-Spec MARCS/BaSTI 5 < 13
TGE Map I GSP-Phot < 19

Notes. The following notation is used: XP = BP/RP spectra (through sampled mean spectra), RVS = RVS spectra; ϖ = parallax, pm = proper motions, G = Gaia photometry which implies G, GBP, and/or GRP. Object Type is S, B, E, I, O for star, binary, extragalactic, interstellar, and outlier, respectively. Under Apsis Input Data, values in “()” mean that APs are used to initialise the analysis or as selection criteria only.

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