Table 1
Statistics of the cross-matches of Gaia EDR3 to external QSO catalogues used in the construction of Gaia-CRF3.
| Catalogue | Sources | Unique matches | Filtered sources | Retained sources | Code | Reference |
|---|---|---|---|---|---|---|
| ICRF3 S/X | 4536 | 3477 | 3142 | 3142 | icrf3sx | Charlot et al. (2020) |
| ICRF3 K | 824 | 715 | 660 | 660 | icrf3k | Charlot et al. (2020) |
| ICRF3 X/Ka | 678 | 611 | 576 | 576 | icrf3xka | Charlot et al. (2020) |
| OCARS | 7607 | 5337 | 4723 | 4723 | ocars | Malkin (2018) |
| AllWISE | 1 354775 | 733 462 | 580 403 | 580 403 | aw15 | Secrest et al. (2015) |
| Milliquas v6.5 | 1 980 903 | 1 347 414 | 1 065 936* | 1 039 610 | m65 | Flesch (2019) |
| R90 | 4 543 530 | 1 331 547 | 1 022081 | 1 022 081 | r90 | Assef et al. (2018) |
| C75 | 20 907 127 | 2068 813 | 1 265 419* | 1 169 431 | c75 | Assef et al. (2018) |
| SDSS DR14Q | 526 356 | 368 013 | 308 608 | 308 608 | dr14q | Paris et al. (2018) |
| LQAC-5 | 592809 | 421 289 | 348 085 | 348 085 | lqac5 | Souchay et al. (2019) |
| LAMOST phase 1, DR1-5 | 42 578 | 42 255 | 39 886 | 39886 | lamost5 | Yao et al. (2019) |
| LQRF | 100165 | 98 902 | 94839 | 94839 | lqrf | Andrei et al. (2009) |
| 2QZ | 28 495 | 24192 | 21 569 | 21 569 | cat2qz | Croom et al. (2004) |
| Roma-BZCAT, release 5 | 3561 | 3343 | 2986 | 2986 | bzcat5 | Massaro et al. (2015) |
| 2WHSP | 1691 | 982 | 413 | 413 | cat2whsp | Chang et al. (2017) |
| ALMA calibrators | 3361 | 2746 | 2209 | 2209 | alma19 | Bonato et al. (2019) |
| Gaia-unWISE C75 | 2 734464 | 2 726 201 | 2 061 253* | 1569 359 | guw | Shu et al. (2019) |
| Total retained matches | 1 614 173 | |||||
Notes. The external QSO catalogues used to construct Gaia-CRF3 are identified in Cols. 1 and 7. Column 2 is the total number of sources in the catalogue. Column 3 gives the number of unique matches in Gaia EDR3 to the catalogue, using a matching radius of ∆max = 100 mas for the four VLBI-based catalogues (ICRF3 and OCARS) and ∆max = 2 arcsec for the other catalogues. Column 4 contains the number of matched sources satisfying Eqs. (1)–(5) (where the last two criteria were not used for the VLBI-based catalogues). An asterisk means that the filtered sources show evidence of stellar contamination. Column 5 gives the number of sources retained in Gaia-CRF3 after the second stage of the filtering described in Sect. 2.3. Column 6 gives the code for the catalogue in the cross-match table gaiadr3.gaia_crf3_xm (see Appendix C).
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