Table 1.
Redshift measurements.
| Measurement | z | Unc. | Reference |
|---|---|---|---|
| Quasar and host galaxy | |||
| Lyman-α | 5.85 | 0.02 | Cool et al. (2006) |
| CO | 5.8918 | 0.0018 | Wang et al. (2010) |
| C III] | 5.861 | 0.007 | Shen et al. (2019) |
| C IV | 5.851 | 0.010 | Shen et al. (2019) |
| Si IV | 5.865 | 0.015 | Shen et al. (2019) |
| Quasar NLR | 5.890 | 0.010 | This work |
| Quasar BLR | 5.888 | 0.010 | This work |
| Host galaxy | 5.901 | 0.010 | This work |
| Companions | |||
| NE (region 1) | 5.882a | 0.010 | This work |
| Bridge (region 2) | 5.891a | 0.010 | This work |
| SE (region 4) | 5.902a | 0.010 | This work |
| Possible lensing galaxy | |||
| [O III], Hα | 1.135 | 0.010 | This work |
Notes. The quasar redshifts from this work are from the Hβ line for the BLR and from the kinematically tied [O III] λλ 4959,5007 and Hβ lines for the NLR. The host-galaxy and companion redshifts are based on fits to the [O III] λλ 4959,5007, Hβ, [N II] λλ 6548,6584, and Hα narrow lines, which are all kinematically tied to have the same redshift. Redshift measurements of these regions with the cross-correlation programme XCSAO (Kurtz & Mink 1998, spiral template covering rest wavelengths 2984 to 7379 Å) are consistent with the tabulated values. When emission lines are excluded from the fit, the S/N of absorption features are too low to give a redshift measurement.
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