Table 9
Comparison among main catalogs from previous X-ray missions operating, at least partly, in the ‘classical’ X-ray energy range (~0.2–10 ke V).
| Catalogue [Mission] | Nobjects | Time span | fArea | Energy coverage | Reference |
|---|---|---|---|---|---|
| 4U [Uhuru] | 339 | 1970–1972 | 0.97 | 2.0–6.0 keV | (1) |
| 3A [Ariel-V] | 250 | 1974–1979 | 1.0 | 2.0–10 keV | (2) |
| A1 [HEAO-1] | 842 | 1977–1978 | 1.0 | 0.25–25 keV | (3) |
| IPC [Einstein] | 4000 | 1978–1981 | 0.33 | 0.3–3.5 keV | (4) |
| 2RXS [ROSAT] | 135000 | 1990 | 1.0 | 0.1–2.4 keV | (5) |
| WGACAT [ROSAT] | 84000 | 1991–1995 | 0.18 | 0.1–2.4 keV | (6) |
| CSC2.1 [Chandra] | 400000 | 1999–2022 | 0.019 | 0.2–7.0 keV | (7) |
| 4XMM-DR12 [XMM-Newton] | 630000 | 2000–2022 | 0.031 | 0.2–12 keV | (8) |
| 4XMM-DR12 Hard [XMM-Newton](*) | 456000 | 2000–2022 | 0.031 | 2–5 keV | (8) |
| XMMSL2 [XMM-Newton] | 72000 | 2001–2014 | 0.84 | 0.2–12 keV | (9) |
| 2SXPS [Swift] | 206000 | 2005–2018 | 0.092 | 0.3–10 keV | (10) |
| eFEDS [SRG/eROSITA] | 27000 | 2019 | 0.033 | 0.2–2.3 keV | (11) |
| eRASS1 Main [SRG/eROSITA] | 930000 | 2019–2020 | 0.5 | 0.2–2.3 keV | This work |
| eRASS1 Hard [SRG/eROSITA] | 5466 | 2019–2020 | 0.5 | 2.3–5.0 keV | This work |
Notes. The column Nobjects lists the approximate number of sources in each catalogue and fArea is the fraction of the sky observed. (*)The 4XMM-DR12 Hard catalogue (not shown in the figure) is derived from the 4XMM-DR12 by taking all sources for which the 2–5 keV flux is larger than the quoted 2–5 keV flux error.
References. (1): Forman et al. (1978); (2): Warwick et al. (1981); (3) Wood et al. (1984); (4) heasarc.gsfc.nasa.gov/W3Browse/einstein/ipc.html, Harris (1990); (5): Boller et al. (2016); (6): heasarc.gsfc.nasa.gov/W3Browse/rosat/wgacat.html; (7) cxc.cfa.harvard.edu/csc/about2.l.html; (8) Webb et al. (2020); (9) www.cosmos.esa.int/web/xmm-newton/xmmsl2-ug; (10) Evans et al. (2020); (11) Brunner et al. (2022).
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