Speaker
Description
The flat spectrum radio quasar (FSRQ) PKS 1510-089 (z=0.361) is known for its complex multi-wavelength behaviour. Since 2015, it has been very active across the entire electromagnetic spectrum. This has lead to joint observation campaigns including Fermi-LAT, Cherenkov telescopes and several instrument covering the synchrotron branch. Observations resulted in a range of remarkable measurements, including rapid flares above 200 GeV – peaking at more than 30 times long-term average – and unprecedented optical flares peaking in R-band at 13.6 magnitudes – almost 6 times long-term average. The comparison of the different instrument's results also show that different events follow different spectral evolution within the gamma-ray band and display different relationships to the synchrotron emission. We discuss the effect of pair-absorption on flares originating at different distances from the core and conclude that absorption in the BLR is not the sole reason for the broad-band diversity.
