Table 11.
Expected number of FXTs for different X-ray missions.
| Mission | FoV | Tavail | Flim | FXTs |
|---|---|---|---|---|
| (deg2) | (yr) | (erg cm−2 s−1) | (# yr−1) | |
| (1) | (2) | (3) | (4) | (5) |
| Ongoing missions | ||||
| XMM-Newton-EPIC | 0.25 | ∼15.1 | ∼1 × 10−13 | 6 [4–7] |
| Swift-XRT | 0.15 | ∼11.3 | ∼3 × 10−13 | 0.8 [0.7–1.1] |
| SRG-eROSITA | 0.80 | ∼4.0 | ∼4 × 10−13 | 3 [2–4] |
| Future missions | ||||
| Einstein Probe-WXT | 3600 | ≳3.0 ( † ) | ∼5 × 10−10 | 13 [10–16] |
| STAR-X-XRT | 1.00 | ≳5.0 ( † ) | ∼1 × 10−14 | 180 [140–235] |
| AXIS | 0.12 | ≳4.0 ( † ) | ∼3 × 10−14 | 50 [39–63] |
| Athena-WFI | 0.40 | 0.6 | ∼5 × 10−15 | 460 [357–581] |
Notes. Column 1: mission and instrument. Column 2: nominal field-of-view. Column 3: available exposure time considered, actual (launch to date) or nominal (mission lifetime, denoted by ( † )). Column 4: assumed FXT detection X-ray flux limit (to avoid Poisson fluctuations, we adopt 10× the nominal source detection flux limit). Column 5: predicted FXT number per year.
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