Table 1.
Statistics of the known multiply imaged quasars present in our reference list (Col. 2) and of the corresponding detected systems in Gaia DR2 (Col. 3).
| Lensed images | Number of known lenses | Number detected in Gaia DR2 |
|---|---|---|
| 1 | 55 + (213) = 268 | 11 + (17) = 28 |
| 2 | 133 + (33) = 166 | 112 + (32) = 144 |
| 3 | 2 + (1) = 3 | 4 + (1) = 5 |
| 4+ | 43 + (1) = 44 | 28 + (1) = 29 |
| Total | 233+(248) = 481 | 155 +(51) = 206 |
Notes. Col. 1: number of astrometric positions given in the literature. A lensed system is considered to be detected in the Gaia DR2 if at least one of its images is detected. Numbers in parentheses correspond to the gravitationally lensed quasar candidates not spectroscopically confirmed yet.
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