Funk S (2005)
Publication Type: Journal article
Publication year: 2005
Book Volume: 442
Pages Range: L25-L29
Journal Issue: 3
DOI: 10.1051/0004-6361:200500180
We report on a possible association of the recently discovered very high-energy gamma-ray source HESSJ1825-137 wit the pulsar wind nebula (commonly referred to as G 18.0-0.7) of the 2.1 x 10(4) year old Vela-like pulsar PSRB1823-13.HESSJ1825-137 was detected with a significance of 8.1 sigma in the Galactic Plane survey conducted wit the HESS instrument in 2004. The centroid position of HESSJ1825-137 is offset by 11' south of the pulsar position. XMM-Newton observations have revealed X-ray synchrotron emission of an asymmetric pulsar wind nebula extending to the south of the pulsar. We argue that the observed morphology and TeV spectral index suggest that HESSJ1825-137 and G18.0-0.7 may be associated: the lifetime of TeV emitting electrons is expected to be longer compared to the XMM-Newton X-ray emitting electrons, resulting in electrons from earlier epochs (when the spin-down power was larger) contributing to the present TeV flux. These electrons are expected to be synchrotron cooled, which explains the observed photon index of similar to 2.4, and the longer lifetime of TeV emitting electrons naturally explains why the TeV nebula is larger that the X-ray size. Finally, supernova remnant expansion into an inhomogeneous medium is expected to create reverse shocks interacting at different times wit the pulsar wind nebula, resulting in the offset X-ray and TeV gamma-ray morphology.
APA:
Funk, S. (2005). A possible association of the new VHE gamma-ray source HESS J1825-137 with the pulsar wind nebula G18.0-0.7. Astronomy & Astrophysics, 442(3), L25-L29. https://dx.doi.org/10.1051/0004-6361:200500180
MLA:
Funk, Stefan. "A possible association of the new VHE gamma-ray source HESS J1825-137 with the pulsar wind nebula G18.0-0.7." Astronomy & Astrophysics 442.3 (2005): L25-L29.
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