14.1.6 Radial velocities

While Gaia EDR3 merely repeated the 7 M radial velocities from Gaia DR2, Gaia DR3 introduces 30 M radial velocities using the much larger set of observations.

Tests discussed below show:

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  Some spurious velocities in the vicinity of bright(er) sources. This is a long known problem that has been greatly diminished in Gaia DR3, but errors of more than 500$\mathrm{km}{\mathrm{s}}^{-1}$ may still occur, cf. Section 14.2.6;

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  Intriguing differences with the GOG20 model as shown in Figure 14.46 and Figure 14.47;

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  A small set of faint $(G>16)$ magnitude, very red sources still have radial velocities, that may be spurious, cf. Section 14.5.2

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  Tests using clusters suggest that small radial_velocity_error (below 2 $\mathrm{km}{\mathrm{s}}^{-1}$) are underestimated, cf. Section 14.7.3.