Table 3.
Detection parameters of the WHIM for the X-IFU.
| Fstart | F0.3−10 | X-IFU counts | # GRBs | EWO VII | dN (>EWO VII)/dz |
EWO VIII | dN (>EWO VIII)/dz |
||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| [erg cm−2 s−1] | [erg cm−2 s−1] | (in 50 ks) | % | [eV] | z = 0.1 | z = 0.2 | z = 0.5 | [eV] | z = 0.1 | z = 0.2 | z = 0.5 |
| 1 × 10−10 | 3.3 × 10−11 | 4.8 × 106 | 1.46 | 0.13 | 2.39 | 2.40 | 1.81 | 0.09 | 2.32 | 2.41 | 2.44 |
| 5 × 10−11 | 1.7 × 10−11 | 2.4 × 106 | 2.8 | 0.18 | 1.33 | 1.32 | 0.85 | 0.12 | 1.46 | 1.50 | 1.46 |
| 4 × 10−11 | 1.4 × 10−11 | 1.9 × 106 | 3.81 | 0.20 | 1.04 | 1.03 | 0.63 | 0.13 | 1.25 | 1.29 | 1.24 |
| 3 × 10−11 | 1.0 × 10−11 | 1.4 × 106 | 4.59 | 0.30 | 0.30 | 0.31 | 0.14 | 0.20 | 0.48 | 0.47 | 0.37 |
| 1 × 10−11 | 3.3 × 10−12 | 4.8 × 105 | 15.58 | 0.39 | 0.11 | 0.13 | 0.04 | 0.26 | 0.20 | 0.18 | 0.12 |
Notes. Column 1: simulated starting flux (erg cm−2 s−1) of the GRB afterglow; Col. 2: 0.3−10 keV average absorbed flux (erg cm−2 s−1) during a 50 ks observation of a GRB afterglow with the X-IFU; Col. 3: high resolution counts collected during the 50 ks observation of the GRB afterglow; Col. 4: the percentage of GRB afterglows per year above the flux in Col. 2 based on the Swift population of GRBs; Col. 5: minimum equivalent width (eV) of O VII for a 75% chance of detection with the X-IFU; Cols. 6−8: expected number of absorption systems per unit redshift for O VII above EW in Col. 5 at redshifts z= 0.1, 0.2 and 0.5; Col. 9: minimum equivalent width (eV) of O VIII for a 75% chance of detection with the X-IFU; Cols. 10−12: expected number of absorption systems per unit redshift for O VIII above EW in Col. 9 at redshifts z = 0.1, 0.2 and 0.5.
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