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Table B.1.
Description of the fields contained in the Gaia GraL catalogue of clusters from Gaia DR2 sources.
| Num. | Field name | Unit | Description |
|---|---|---|---|
| 1. | row | Unique identifier of the row in the catalogue. Each combination of the name and the SourceId is always associated with a unique row. | |
| 2. | name | Unique identifier of the cluster. This identifier is based on the mean position of the images of the cluster taken in sexagesimal coordinates. | |
| 3. | nimg | The number of images constituting the cluster (nimg ∈{3,4}). | |
| 4. | size | (″) | The maximum angular separation between any two images of the cluster (size ≤6″). |
| 5. | known | Identifier in the list of known and candidate lenses from Ducourant et al. (2018). Empty if this cluster is not recognized as a known or candidate lens. | |
| 6. | density | (obj. deg−2) | The mean density of objects surrounding the cluster, estimated by counting the Gaia DR2 objects falling in a 30″ radius around one of its constituent members (density ≤6 × 104 objects deg−2). |
| 7. | dmag | (mag) | The maximum absolute difference in the G magnitude, ΔG, between the images of the cluster (dmag ≤ 4 mag). |
| 8. | dcolor | (mag) | The maximum absolute difference in colour, Δ(GBP − GRP), between the images of the cluster. Empty if fewer than two images have colour information (i.e. BPmag or RPmag is empty). |
| 9. | ncolor | The number of images having colour information that are used in the computation of dcolor. | |
| 10. | P | ERT probability associated with this cluster (see Sect. 3). | |
| If nimg = 4, then this parameter corresponds to the ERT probabilities computed based on the ABCD model. | |||
| If nimg = 3, then this field is taken as the maximum of PABC, PABD, PACD, and PBCD. | |||
| 11. | PABC | ERT probability computed based on the ABC model. Empty if nimg = 4. | |
| 12. | PABD | ERT probability computed based on the ABD model. Empty if nimg = 4. | |
| 13. | PACD | ERT probability computed based on the ACD model. Empty if nimg = 4. | |
| 14. | PBCD | ERT probability computed based on the BCD model. Empty if nimg = 4. | |
| 15. | SourceId | Unique source identifier from Gaia DR2. | |
| 16. | RA | (°) | Right ascension of the source in ICRS coordinates from Gaia DR2. |
| 17. | Dec | (°) | Declination of the source in ICRS coordinates from Gaia DR2. |
| 18. | Gmag | (mag) | G-band mean magnitude from Gaia DR2. |
| 19. | BPmag | (mag) | Integrated BP mean magnitude from Gaia DR2. |
| Empty if no BP magnitude is available. | |||
| 20. | RPmag | (mag) | Integrated RP mean magnitude from Gaia DR2. |
| Empty if no RP magnitude is available. | |||
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