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A new model of the Milky Way (MW) halo component of the dispersion measure(DM) for extragalactic sources, such as fast radio bursts (FRBs), is presentedin light of recent diffuse X-ray observations. In addition to the sphericalcomponent of isothermal gas ($kT\sim0.3$ keV) in hydrostatic equilibrium withthe Galactic gravitational potential, our model includes a disk-likenon-spherical hot gas component to reproduce the directional dependence of theobserved X-ray emission measure (EM). The total gas mass($1.2\times10^{11}\,M_{\odot}$) is dominated by the spherical component, and isconsistent with the total baryon mass of the MW expected from the dark mattermass and the cosmic baryon-to-dark-matter ratio. Our model predicts a mean haloDM of $43\:\,{\rm pc\:cm^{-3}}$, with a full range of $30$-$245\:\,{\rmpc\:cm^{-3}}$ over the whole sky. The large scatter seen in the X-ray EM dataimplies a $\sim0.2$ dex (rms) fluctuation of the MW halo DM. We provide ananalytic formula to estimate the MW halo DM of our model along any line ofsight, which can be easily used to compute the total MW component of DM towardextragalactic sources, in combination with existing DM models of the warmionized medium associated with the Galactic disk.

The Galactic Halo Contribution to the Dispersion Measure of Extragalactic Fast Radio Bursts