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Flux variability in the FSRQ 1510-089. A radio-gamma perspective
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The knowledge of the physical conditions occurring in the relativistic jet of radio-loud active galactic nuclei (AGNs) is important to understand the mechanisms at the basis of their multiband emission. From parsec-scale radio observations of blazar objects it has been suggested a connection between the ejection of new jet features and strong gamma-ray flares. We present results from multi-epoch Very Long Baseline Interferometer (VLBI) and Space-VLBI observations of the Flat Spectrum Radio Quasar (FSRQ) PKS 1510-089. The comparison of the radio structure observed at different epochs shows the presence of jet features moving with highly superluminal apparent velocity. Radio flux density variability and changes in the source structure and in the polarization properties are then compared with the information on the gamma-ray emission in order to find a possible connection between radio and gamma-ray emission.
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