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Milky Way's hot gaseous halo extends up to the Galactic virial radius ($\sim200$ kpc) and contains a significant component of baryon mass of the Galaxy.The halo properties can be constrained from X-ray spectroscopic observationsand from satellite galaxies' ram-pressure stripping studies. Results of theformer method crucially depend on the gas metallicity assumptions while thelatter one's are insensitive to them. Here, a joint analysis of both kinds ofdata is presented to constrain electron density and metallicity of the gas. Thepower law is assumed for the electron density radial profile, while for themetallicity, a common-used constant-metallicity assumption is relaxed byintroducing of a physically motivated spherical profile. The model is fitted toa sample of 431 (18) sight lines for O VII emission (absorption) measurementsand 7 electron density constraints from ram-pressure stripping studies. Thebest-fitting halo-associated electron density profile of $n_e\proptor^{-(0.9...1.1)}$ (where $r\gg1$ kpc is the galactocentric radius) is found.The metallicity is constrained as $Z \approx (0.1...0.7) Z_{\odot}$ (subscript$\odot$ represents the solar values) at $r>50$ kpc. These imply a total hot gasmass of $M \approx (2.4...8.7) \times 10^{10} M_{\odot}$, which accounts for$\sim(17...100)$ per cent of the Milky Way's missing baryon mass. The modeluncertainties are discussed, and the results are examined in the context ofprevious studies.

Constraining density and metallicity of the Milky Way's hot gas halo from O VII spectra and ram-pressure stripping