Table 1.
QSO dataset.
| Quasar | zabs | Δα/α | Spectrograph | Reference |
|---|---|---|---|---|
| (ppm) | ||||
| J0120 + 2133 | 0.729 | 0.73 ± 6.42 | HDS | 1 |
| J0026 − 2857 | 1.023 | 3.54 ± 8.87 | UVES | 2 |
| J0058 + 0041 | 1.072 | −1.35 ± 7.16 | HIRES | 2 |
| 3 quasars | 1.080 | 4.30 ± 3.40 | HIRES | 3 |
| HS1549 − 1919 | 1.143 | −7.49 ± 5.53 | UVES/HIRES/HDS | 4 |
| HE0515 − 4414 | 1.151 | 1.31 ± 1.36 | ESPRESSO | 5 |
| HE0515 − 4414 | 1.151 | −1.42 ± 0.85 | UVES | 6 |
| HE0515 − 4414 | 1.151 | −0.27 ± 2.41 | HARPS | 7 |
| J1237 + 0106 | 1.305 | −4.54 ± 8.67 | HIRES | 2 |
| J0120 + 2133 | 1.325 | 2.60 ± 4.19 | HDS | 1 |
| HS1549 + 1919 | 1.342 | −0.70 ± 6.61 | UVES/HIRES/HDS | 4 |
| J0841 + 0312 | 1.342 | 3.05 ± 3.93 | HIRES | 2 |
| J0841 + 0312 | 1.342 | 5.67 ± 4.71 | UVES | 2 |
| J0120 + 213 | 1.343 | 8.36 ± 12.16 | HDS | 1 |
| J0108 − 0037 | 1.371 | −8.45 ± 7.34 | UVES | 2 |
| HE0001 − 2340 | 1.580 | −1.50 ± 2.60 | UVES | 8 |
| J1029 + 1039 | 1.622 | −1.70 ± 10.11 | HIRES | 2 |
| HE1104 − 1805 | 1.661 | −4.70 ± 5.30 | HIRES | 3 |
| HE2217 − 2818 | 1.692 | 1.30 ± 2.60 | UVES | 9 |
| HS1946 + 7658 | 1.738 | −7.90 ± 6.20 | HIRES | 3 |
| HS1549 + 1919 | 1.802 | −6.42 ± 7.25 | UVES/HIRES/HDS | 4 |
| Q1103 − 2645 | 1.839 | 3.30 ± 2.90 | UVES | 10 |
| Q2206 − 1958 | 1.921 | −4.65 ± 6.41 | UVES | 2 |
| Q1755 + 57 | 1.971 | 4.72 ± 4.71 | HIRES | 2 |
| PHL957 | 2.309 | −0.65 ± 6.84 | HIRES | 2 |
| PHL957 | 2.309 | −0.20 ± 12.93 | UVES | 2 |
| J0035 − 0918 | 2.340 | −12.0 ± 11.0 | ESPRESSO | 11 |
Notes. The first column is the name of the source, zabs is the absorber redshift of the measurement along the line of sight, Δα/α is the respective measured variation of the fine-structure constant in parts per million (ppm), with the corresponding quadrature sum of statistical uncertainty and systematic error (1σ). The two last columns give respectively the name of the spectrograph used and the reference of the measurement.
References. (1) Murphy & Cooksey (2017); (2) Murphy et al. (2016); (3) Songaila & Cowie (2014); (4) Evans et al. (2014); (5) Murphy et al. (2022); (6) Kotuš et al. (2016); (7) Milaković et al. (2020); (8) Agafonova et al. (2011); (9) Molaro et al. (2013); (10) Bainbridge & Webb (2017); (11) Welsh et al. (2020).
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