Propagation of High Energy Extragalactic Photons and Constraints on Lorentz Invariance Breaking

Astronomy and Astrophysics – Astrophysics

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Scientific paper

Several members of the subclass of gamma-ray emitting blazars known as high frequency BL Lac objects have now been detected at TeV gamma-ray energies. Gamma-rays of such energies, propagating over extragalactic distances, are expected to interact with the low energy photons produced in galaxies and emitted into intergalactic space - particularly the infrared photons from reradiation of starlight by interstellar dust in galaxies. These interactions should result in the annihilation of gamma-rays with the resultant production of electron-positron pairs. Recent observations of this extragalactic background by the COBE satellite, as well as infrared studies of the galaxies themselves, have given us a good idea of the spectral energy distribution of the IR background. Observations of multi-TeV blazar spectra which contain information about attenuation by pair production annihilation can be used in conjunction with the IR background results to test for evidence of Lorentz invariance breaking, which would inhibit the pair production interactions. Already this data can be used to rule out some forms of quantum gravity models.

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