Gaia Data Release 2
Free Access

Fig. 5


Density map of the full quasar sample (union of AllWISE AGNs and VLBI sources) at a resolution of 1.8 × 1.8 deg2. The scatter of points in the Galactic band are VLBI sources. This and following full-sky maps use a Hammer–Aitoff projection in equatorial (ICRS) coordinates with α = δ = 0 at the centre, north up, and α increasing from right to left.

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