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We present X-ray observations of the as of yet unidentified very high-energy(VHE) gamma-ray source HESSJ1640-465 with the aim of establishing a counterpartof this source in the keV energy range, and identifying the mechanismresponsible for the VHE emission. The 21.8 ksec XMM-Newton observation ofHESSJ1640-465 in September 2005 represents a significant improvement insensitivity and angular resolution over previous ASCA studies in this region.These new data show a hard-spectrum X-ray emitting object at the centroid ofthe H.E.S.S. source, within the shell of the radio Supernova Remnant (SNR)G338.3-0.0. This object is consistent with the position and flux previouslymeasured by both ASCA and Swift-XRT but is now shown to be significantlyextended. We argue that this object is very likely the counterpart toHESSJ1640-465 and that both objects may represent the Pulsar Wind Nebula of anas of yet undiscovered pulsar associated with G338.3-0.0.Comment: submitted to the Astrophysical Journa

XMM‐NewtonObservations Reveal the X‐Ray Counterpart of the Very High Energy Gamma‐Ray Source HESS J1640−465