Table 3.
X-ray and FUV measurements of the Ton S 180 oxygen absorber.
| X-RAY | FUV | ||||
|---|---|---|---|---|---|
| z = 0.04579 | z = 0.0455 | z = 0.04579 | |||
| Parameter | SLAB | CIE | SLAB | CIE | |
| log NOVI (cm−2) | – | 13.8 ± 0.2 | – | 13.9 ± 0.2 | 13.68 ± 0.10 |
| log NOVII (cm−2) |
 |
16.4 ± 0.2 |
 |
16.4 ± 0.2 | – |
| log NOVIII (cm−2) |
 |
15.9 ± 0.2 |
 |
16.0 ± 0.2 | – |
| σOVI | – | – | – | – | 5.4 |
| σOVII | 5.0 | – | 5.1 | – | – |
| σOVIII | (1.1) | – | (1.0) | – | |
| btot, oxygen (km s−1) | 141 (*) | – |
 |
– | < 38.1 |
| bnt (km s−1) | – | 141 (*) | – | 97 (*) | – |
| kT (kev) | – | 0.14 ± 0.02 | – | 0.14 ± 0.02 | < 0.12 |
| T (K) | – | 1.7 ± 0.2 × 106 | – | 1.7 ± 0.2 × 106 | < 1.4 × 106 |
| NH (Z⊙/Z × 1019 cm−2) | – |
 |
– |
 |
– |
log  (cm−2) |
– | 12.9 ± 0.2 (**) | – | 12.9 ± 0.2 (**) | < 13.01 (***) |
| ΔC | 12 | 15 | 14 | 15 | – |
Notes. Results of the X-ray analysis with ‘slab’ (for the individual oxygen ions) and CIE absorption models, conducted on the fixed FUV redshift zOVI = 0.04579 absorber (Cols. 2–3) and at the X-ray fitted hot absorber redshift zOVII = 0.0455 (Cols. 4–5), and the FUV analysis at the redshift of the stronger O VI absorber (col. 6). The X-ray results on O VI and H I are model predictions. The quoted temperatures are the CIE ionization temperature (X–ray) and the upper limit on the O VI ion temperature (FUV). The parameter values are quoted with their respective 1σ uncertainties, whereas the upper limits are given at their 3σ limit. ΔC is the improvement of the fit statistics due to the addition of the redshifted absorption component (in SLAB columns, the O VII ‘slab’). All the X-ray models yield C-stat/d.o.f. ≈1.04 − 1.06.
Formal 3σ upper limit obtained from STIS assuming bHI = 200 km s−1. See Sect. 6 for details.
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