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Most of the baryons from galaxies have been "missing" and several studieshave attempted to map the circumgalactic medium (CGM) of galaxies in theirquest. Recent studies with the Hubble Space Telescope have shown that manygalaxies contain a large reservoir of ionized gas with temperatures of about10^5 K. Here we report on X-ray observations made with the Chandra X-rayObservatory probing an even hotter phase of the CGM of our Milky Way at about10^6 K. We show that this phase of the CGM is massive, extending over a largeregion around the Milky Way, with a radius of over 100 kpc. The mass content ofthis phase is over ten billion solar masses, many times more than that incooler gas phases and comparable to the total baryonic mass in the disk of theGalaxy. The missing mass of the Galaxy appears to be in this warm-hot gasphase.

A huge reservoir of ionized gas around the Milky Way: Accounting for the Missing Mass?