Table 1
Best-fit parameters of the correlation between surface brightness of the 0.7 keV emission and the stellar mass surface density of the Milky Way.
| All | ||||
|---|---|---|---|---|
| M17 | M17+β | H24 | H24+β | |
| EM | 7.7 × 10−4 | |||
| Lx/M | 11.8 ± 0.1 | 10.4 ± 0.2 | 10.5 ± 0.1 | 9.8 ± 0.2 |
| h⊙ | 29 ± 3 | 23 ± 4 | 27 ± 5 | 23 ± 5 |
| ne | … | 0.3 ± 0.1 | … | 0.2 ± 0.1 |
| χ2 | 1387.3 | 1310.9 | 1530.4 | 1510.5 |
| d.o.f. | 1145 | 1144 | 1145 | 1144 |
| p | 10−6 | 4 × 10−4 | 10−13 | 10−12 |
| Bright point sources removed | ||||
| M17 | M17+β | H24 | H24+β | |
| EM | 5.2 × 10−4 | |||
| Lx/M | 7.62 ± 0.07 | 7.09 ± 0.15 | 6.87 ± 0.06 | 6.9 ± 0.1 |
| h⊙ | 31 ± 4 | 28 ± 4 | 33 ± 5 | 34 ± 6 |
| ne | … | 0.17 ± 0.09 | … | <0.1 |
| χ2 | 1313.9 | 1295.9 | 1327.1 | 1326.6 |
| d.o.f. | 1196 | 1195 | 1196 | 1195 |
| p | 0.01 | 0.02 | 5 × 10−3 | 4 × 10−3 |
Notes. The surface brightness (SB) is in units of erg s−1 cm−2 sr−1, the stellar mass surface density of the Milky Way is in units of M⊙ cm−2 sr−1, following both the McMillan (2017) (M17), the McMillan (2017) plus a beta model component (M17+β), and the Hunter et al. (2024) (H24) models. The luminosity per solar mass (Lx/M) is in units of 1027 erg 
; the height of the Sun above the Galactic plane (h⊙) is in parsecs; the density of the hot halo fitted with a beta model with β = 0.4 and core radius of Rc = 1 kpc is given in units of 10−3 cm−3 and it is the best-fit value at 10 kpc from the centre; then, the fit statistics (χ2) and degrees of freedom (dof) are given.
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