Table 5.
Forecast S/N for future eROSITA-based experiments.
| Area | Ng | |||
|---|---|---|---|---|
| [deg2] | [106] |
 |
 |
|
| eRASS1 + public 2021 | 21k | 1.2 | 0.1 | 1.8 |
| eRASS:8 + WAVES | 1k | 0.7 | 0.8 | 4.0 |
| eRASS:3 + DESI BGS | 5k | 7 | 0.3 | 7.7 |
| eRASS:8 ‘Legacy’ | 21k | 20 | 0.8 | 21.2 |
Notes. Average S/N improvement ratio with respect to the eFEDS+GAMA09 sample (
) for four possible combinations of eROSITA all-sky survey depths and low-redshift galaxy spectroscopic samples. The Area (in square degrees) reported is the approximate overlap between the German eROSITA all-sky survey (Sunyaev et al. 2021) and the galaxy samples; Ng is the number of galaxies with z ≲ 0.3 in this area (in millions), while 
is the average ratio between the corresponding eRASS exposure and the eFEDS one.
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