Gaia Data Release 2
Free Access

Fig. 1

image

Distribution of normalised, re-centred parallaxes of 556 849 quasars from the AllWISE catalogue present in Gaia DR2 (blue curve). The grey curve denotes the subsample composed of 492 920 sources with parallax errors σϖ < 1 mas. The centring adopted in this plot reflects a global parallax zero-point shift of − 0.029 mas. Ideally, both curves should follow a normal distribution with zero mean and unit variance. The red curve shows a Gaussian distribution with the same standard deviation (1.081) as the normalised centred parallaxes for the full sample. Figure from Lindegren et al. (2018).

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