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Among Galactic VHE (very high energy, E > 100 GeV) γ-ray sources, pulsar wind nebulae (PWNe) form the most abundant class. At the same time, there are numerous sources of VHE γ-rays which are still unidentified. A firm identification of such objects requires a counterpart at other wavelengths. Middle-aged PWNe may account for many of these unidentified sources. While leptons that have been injected into a PWN a long time ago can still cause the observed VHE γ-ray flux, the present energy output of the pulsar is significantly reduced with respect to former times and powers only a faint synchrotron nebula which is difficult to detect with current X-ray observatories. We present a time-dependent model to study the spectral evolution of PWNe. With this model it is possible to roughly predict the X-ray emission of PWNe based on the VHE γ-ray observations only. These predictions allow to select those unidentified VHE γ-ray sources for which, assuming an evolved PWN scenario, a detection of an X-ray counterpart ...

Unidentified VHE γ-ray sources and evolved pulsar wind nebulae - A possible connection?