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In the unified model of active galactic nuclei (AGNs), blazars are of a special subclass whose relativistic jets point towards us, characterized by its violent variation. The variation mechanism of blazars is still in debate. In this talk, I will present a case study on PKS 1502+106. For this target, we obtained the correlations between light curves at different frequencies. The time lag estimation enables us to derive the location of optical and gamma-ray emission regions relative to the radio in jet. A significant correlation between polarization and fluxes is also obtained. We also proposed that the curved jet model can explain the variation in flux, spectral index and polarization in a unified manner. Then, I will present the theoretical frame work, and discussed the scaling law of spectral index, and its application in GRB etc. |
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