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Table 3.
O VIII Lyα measurements at z ∼ 0.054 − 0.056 in the PKS 2155–304 sight line.
| Ref. | RGS1 | LETG/HRC | LETG/ACIS-S | |||||
|---|---|---|---|---|---|---|---|---|
| Exp. time | EWa | Exp. time | EWa | Exp. time | z | EWa | Signif.b | |
| (ks) | (mÅ) | (ks) | (mÅ) | (ks) | (mÅ) | |||
| F02 | – | – | – | – | 80 | 0.056 ± 0.001 | 14.0 |
4.5σ |
| C04 | 110 | ≤7 | – | – | – | – | – | – |
| F07 | – | – | 200 | ≤5 | 280 | 0.054 ± 0.001 | 7.4 |
5.0σ |
| W07 | – | – | 230 | ≤6 | 250 | 0.056 ± 0.001 | 7.5 ± 2.1 | 3.5σ |
| This work | 1200 | ≤1.3 | 310 | ≤2.1 | 330 | 0.0554 ± 0.0004 | 6.2 ± 1.7 | 3.2σ |
Notes.
References. F02: Fang et al. (2002). C04: Cagnoni et al. (2004). F07: Fang et al. (2007). W07: Williams et al. (2007). This work: the final sample.
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