Table 2
Global properties of the eRASS1 broadband map of the diffuse emission.
| Energy band (keV) (1) | FWC count rate (ct s−1 deg−2) (2) | FWC flux (10−7 erg s−1 deg−2 cm−2 keV−1) (3) | Vignette coef. (4) |
|---|---|---|---|
| R45 (0.44–1.21) | 1.720 | 0.0170 | 0.558 |
| R67 (0.73–2.04) | 2.810 | 0.0269 | 0.541 |
| 0.2–0.4 | 0.659 | 0.0095 | 0.543 |
| 0.4–0.6 | 0.527 | 0.0119 | 0.550 |
| 0.6–1.0 | 0.890 | 0.0166 | 0.562 |
| 1.0–2.3 | 2.713 | 0.0311 | 0.526 |
| 2.3–5.0 | 6.750 | 0.0600 | 0.413 |
| Energy band (keV) |  ECF5e20 (1011 ct cm−2 erg−1) (5) |
Count rateavg. (ct s−1 deg−2) (6) | Surface brightnessavg. (10−11 erg s−1 deg−2 cm−2 keV−1) (7) | Total fluxest. (10−7 erg s−1 cm−2 keV−1) (8) |
|---|---|---|---|---|
| R45 (0.44–1.21) | 9.51 | 10.75 ± 0.51 | 1.47 ± 0.07 | 3.03 ± 0.14 |
| R67 (0.73–2.04) | 8.13 | 7.40 ± 0.45 | 0.69 ± 0.04 | 1.43 ± 0.08 |
| 0.2–0.4 | 6.06 | 1.79 ± 0.14 | 1.45 ± 0.09 | 2.99 ± 0.18 |
| 0.4–0.6 | 8.69 | 3.20 ± 0.17 | 1.85 ± 0.08 | 3.82 ± 0.16 |
| 0.6–1.0 | 9.84 | 4.85 ± 0.20 | 1.24 ± 0.03 | 2.57 ± 0.06 |
| 1.0–2.3 | 6.51 | 3.83 ± 0.22 | 0.46 ± 0.02 | 0.94 ± 0.04 |
| 2.3–5.0 | 0.82 | 1.02 ± 0.25 | 0.55 ± 0.09 | 1.17 ± 0.19 |
Notes. All numbers are computed for the western sky (180 < l < 360, −90 > b < 90). Columns: (1) Energy band. (2) The FWC count rate (i.e., instrumental background). (3) FWC flux. (4) Vignette coefficient. (5) ECF in units of 1011 cm−2 erg−1. The fraction 
accounts for the number of TMs used. The spectral model assumed here is a power law with an index Γ = 2 with absorption NH = 2 × 1020 cm−2. (6) Image count rate averaged after subtracting the instrumental background. (7) Estimated surface brightness after subtracting the instrumental background. (8) Estimated total flux of the western sky (180 < l < 360). The factors quoted here are based on the modeling assumptions and should be interpreted with caution due to the associated uncertainty. The errors quoted above are the statistical uncertainties.
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