Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-07
Astrophys.J.662:517-524,2007
Astronomy and Astrophysics
Astrophysics
submitted to the Astrophysical Journal
Scientific paper
10.1086/516567
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 counterpart of this source in the keV energy range, and identifying the mechanism responsible for the VHE emission. The 21.8 ksec XMM-Newton observation of HESSJ1640-465 in September 2005 represents a significant improvement in sensitivity and angular resolution over previous ASCA studies in this region. These new data show a hard-spectrum X-ray emitting object at the centroid of the 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 previously measured by both ASCA and Swift-XRT but is now shown to be significantly extended. We argue that this object is very likely the counterpart to HESSJ1640-465 and that both objects may represent the Pulsar Wind Nebula of an as of yet undiscovered pulsar associated with G338.3-0.0.
Aharonian Felix A.
Funk Stefan
Hinton Jim A.
Hofmann Werner
Puehlhofer Gerd
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