Table 3.
Comparison for the number of galaxy groups for different mass functions: tinker08 (default model, Tinker et al. 2008), watson13 (Watson et al. 2013), and despali16 (Despali et al. 2016).
| Panel | Mass [M⊙] | Mass function | z ≥ 0 | z ≥ 0.5 | z ≥ 1.0 | z ≥ 1.5 | z ≥ 2.0 | z ≥ 2.5 |
|---|---|---|---|---|---|---|---|---|
| tinker08 | 29416719 | 25968096 | 15546565 | 6715285 | 2229519 | 592860 | ||
| ≥1013 | watson13 | 29253536 | 25695123 | 15622655 | 6983156 | 2436322 | 682620 | |
| despali16 | 28430787 | 25107575 | 15124462 | 6561228 | 2203987 | 597631 | ||
| tinker08 | 1738760 | 1354850 | 531448 | 123060 | 18545 | 1941 | ||
| 1st | ≥5 × 1013 | watson13 | 2098401 | 1616700 | 633586 | 146831 | 22284 | 2336 |
| despali16 | 1583691 | 1233233 | 489433 | 114486 | 17665 | 1921 | ||
| tinker08 | 396586 | 279505 | 80316 | 11895 | 1019 | 54 | ||
| ≥1014 | watson13 | 524014 | 363217 | 102711 | 14826 | 1237 | 63 | |
| despali16 | 354015 | 249096 | 72717 | 10943 | 969 | 54 | ||
| 2nd | ≥5 × 1013 | tinker08 | 1960 | 1522 | 593 | 135 | 20 | 1 |
| 3rd | ≥5 × 1013 | tinker08 | 1960 | 1522 | 562 | 89 | 8 | 0 |
Notes. Planck20 cosmology is used for the calculation (Planck Collaboration VI 2020). First panel: number of galaxy groups in the whole sky (first panel in Fig. 10). Second panel: number of galaxy groups expected to be discovered by ATHENA for a nominal mission lifetime of four years with sky coverage of 48 deg2 (third panel in Fig. 10). The results are based on the RE11 baseline simulation. Third panel: expected number of galaxy groups with ΔT/T ≤ 25% in the temperature measurements (fourth panel in Fig. 10). The three bold numbers in the table are indicated as blue stars in Fig. 10.
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