Although accretion onto supermassive black holes in other galaxies is seen to produce powerful jets in X-ray and radio , no convincing detection has ever been made of a kpc-scale jet in the Milky Way .
The recently discovered pair of 10 kpc tall gamma-ray bubbles in our Galaxy may be signs of earlier jet activity from the central black hole .
In this paper , we identify a gamma-ray cocoon feature in the southern bubble , a jet-like feature along the cocoon ’ s axis of symmetry , and another directly opposite the Galactic center in the north .
Both the cocoon and jet-like feature have a hard spectrum with spectral index \sim - 2 from 1 to 100 GeV , with a cocoon total luminosity of ( 5.5 \pm 0.45 ) \times 10 ^ { 35 } and luminosity of the jet-like feature of ( 1.8 \pm 0.35 ) \times 10 ^ { 35 } erg/s at 1 - 100 GeV .
If confirmed , these jets are the first resolved gamma-ray jets ever seen .