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A number of recent studies indicates a significant amount of ionized gas in aform of the hot gas halo around the Milky Way. The halo extends over the regionof 100 kpc and may be acountable for the missing baryon mass. In this paper wecalculate the contribution of the proposed halo to the dispersion measure (DM)of the pulsars. The Navarro, Frenk & White (NFW), Maller & Bullock (MB) andFeldmann, Hooper & Gnedin (FHG) density distibutions are considered for the gashalo. The data set includes pulsars with the distance known independently fromthe DM, e.g. pulsars in globular clusters, LMC, SMC and pulsars with knownparallax. The results exclude the NFW distribution for the hot gas, while themore realistic MB and FHG models are compatible with the observed dispersionmeasure.

Probing Milky Way's hot gas halo density distribution using the dispersion measure of pulsars