Table 1
Summary of the selection criteria applied to find the lensed quasar candidates.
| Step | Selection | Candidates | Lenses | Galaxies | Quasars | Stars |
|---|---|---|---|---|---|---|
| 1 | Initial flag and S/N limits: | 57 464157 | 22 | 246 918 | 77 650 | 65 666 |
| − S /N(i, z, y) > (3, 5, 8) | ||||||
| − [grizy]_apertureflux_20_flag is False | ||||||
| 2 | Presence of neighboring sources within a 2″ radius or objects with available spectroscopic data | 4854831 | 22 | 244080 | 77 603 | 65 656 |
| 3 | Detection in the unWISE MIR catalog: | 911 263 | 22 | 184282 | 56971 | 5629 |
| − S /N(W1, W2) > (5, 3) | ||||||
| − 0.1 < y − W1 < 3.6 | ||||||
| − −0.7 < W1 − W2 < 0.7 | ||||||
| 4 | Detection in the UKIRT or VISTA NIR data: | 621 713 | 22 | 177 900 | 48 588 | 5138 |
| − S /N(J) > 3 | ||||||
| 5 | Optical and NIR color cuts: | 601 277 | 22 | 177 262 | 44531 | 4726 |
| − −0.8 < z − y < 3.9 | ||||||
| − −0.2 < y − J < 2.8 | ||||||
| 6 | Sources with at least one neighbor within a 2″ radius | 389263 | 15 | 14706 | 1792 | 2406 |
| 7 | Sources including their companions | 892609 | 31 | 17 263 | 1990 | 3748 |
| 8 | Ensemble network classification | 3080 | 31 | 439 | 40 | 8 |
| 9 | Astrometric information | 2604 | 31 | 380 | 38 | 5 |
| − Astrometric excess noise < 10 mas | ||||||
| − Proper motion significance < 10σ | ||||||
| 10 | Visual inspection | 210 | … | … | … | … |
Notes. From Step 7 and beyond, the reported numbers are composed of the total primary sources added with their corresponding neighbors. For example, in Step 6 we recover 15 unique known lenses, and in Step 7 this number becomes 31 (see “Lenses”). This addition is because the 14 lenses consist of 2 components while the other 1 system has 3 detected sources in the HSC catalog. Concerning the numbers shown in the columns named “Galaxies”, “Quasars”, and “Stars”, only primary targets and companions with spectroscopic data are counted.
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