TeV observations of gamma‐ray pulsar: A test for pulsar models

We present the first results of TeV γ‐ray observations of PSR1706−44, indicating a sharp spectral break between ∼10 GeV and 1000 GeV. Our and other results confirm similar breaks from other γ‐ray pulsars such as Vela, PSR1509−58 and Geminga. Both the polar cap‐ and outer gap models can account for this break, although a much higher TeV flux from Geminga is expected if it is in the post‐Vela phase, given that the gap is controlled by the inverse Compton process. Relatively flat (possibly time variable) spectra from these pulsars are also seen between X‐rays and medium energy γ‐rays, which can also be explained by the outer gap model.