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We report on the presence of large amounts of million-degree gas in the MilkyWay's interstellar and circum-galactic medium. This gas (1) permeates both theGalactic plane and the halo, (2) extends to distances larger than 60-200 kpcfrom the center, and (3) its mass is sufficient to close the Galaxy's baryoncensus.  Moreover, we show that a vast, $\sim 6$ kpc radius, spherically-symmetriccentral region of the Milky Way above and below the 0.16 kpc thick plane, haseither been emptied of hot gas or the density of this gas within the cavity hasa peculiar profile, increasing from the center up to a radius of $\sim 6$ kpc,and then decreasing with a typical halo density profile. This, and severalother converging pieces of evidence, suggest that the current surface of thecavity, at 6 kpc from the Galaxy's center, traces the distant echo of a periodof strong nuclear activity of our super-massive black-hole, occurred about 6Myrs ago.

A Distant Echo of Milky Way Central Activity closes the Galaxy's Baryon Census