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We report the unambiguous detection of non-thermal X-ray emission up to 30keV from the Cannonball, a few-arcsecond long diffuse X-ray feature near theGalactic Center, using the NuSTAR X-ray observatory. The Cannonball is ahigh-velocity (vproj~500 km/s) pulsar candidate with a cometary pulsar windnebula (PWN) located ~2' north-east from Sgr A*, just outside the radio shellof the supernova remnant Sagittarius A (Sgr A) East. Its non-thermal X-rayspectrum, measured up to 30 keV, is well characterized by a Gamma~1.6power-law, typical of a PWN, and has an X-ray luminosity of L(3-30 keV)=1.3e34erg/s. The spectral and spatial results derived from X-ray and radio datastrongly suggest a runaway neutron star born in the Sgr A East supernova event.We do not find any pulsed signal from the Cannonball. The NuSTAR observationsallow us to deduce the PWN magnetic field and show that it is consistent withthe lower limit obtained from radio observations.

High-Energy X-rays from J174545.5-285829, the Cannonball: A Candidate Pulsar Wind Nebula Associated with Sgr A East