Abstract
One interpretation of the unexplained signature observed in the PVLAS experiment invokes a new axionlike particle (ALP) with a two-photon vertex, allowing for photon-ALP oscillations in the presence of magnetic fields. In the range of masses and couplings suggested by PVLAS, the same effect would lead to a peculiar dimming of high-energy photon sources. For typical parameters of the turbulent magnetic field in the galaxy, the effect sets in at ${E}_{\ensuremath{\gamma}}\ensuremath{\gtrsim}10\text{ }\text{ }\mathrm{TeV}$, providing an ALP signature in the spectra of TeV gamma sources that can be probed with Cherenkov telescopes. A dedicated search will be strongly motivated if the ongoing photon regeneration experiments confirm the PVLAS particle interpretation.
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