engleski

Observed time delays between gamma, X and optical photons from blazars

The physics of blazars can accommodate physical mechanisms which would produce a time delay between photons emitted at different energies. Such time delays could also be due to a violation in the Lorentz symmetry, which would cause a dependence of the speed of light on the photon energy. We simulated a Monte Carlo distribution of correlation coefficients for several artificial time shifts between light curves in two different energy ranges. Assuming that observed high-energy and low-energy photons were emitted simultaneously from a blazar jet, the correlation coefficient vs time shift” plot could indicate a non-zero time delay. Two nearby blazars show a time delay between emitted photons at different energies. We found delays: (4+-1) min between two gamma-ray bands of Mkn 501, and (0.7+-0.3) day between X-ray and optical regions of Mkn 421.

Mkn 421; Mkn 501; gamma-rays; X-rays; optical; correlations; time lags

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