==================================================== Title: Connection between optical, radio and gamma-ray variability in blazars Dr. Talvikki Hovatta Caltech, USA ===================================================== When: Wednesday, November 13 at 2.00 p.m. Where: 2nd Floor Seminar Room ===================================================== Abstract: Blazars are the extreme population of active galactic nuclei whose relativistic jets point very close to the observed line-of-sight. Since the launch of the Fermi Gamma-Ray Space Telescope in 2008, it has become obvious that they are the most numerous objects in the extra-galactic gamma-ray sky. Several studies have shown connections between the emission at gamma rays and other wavebands. In our recent studies using optical observations from the Palomar Transient Factory and Catalina Real-Time Transient Survey, and radio observations from the Owens Valley Radio Observatory blazar monitoring program, we find that the gamma-ray-detected blazars are more variable than the non-detected ones in both optical and radio wavebands. We also find a significant correlation between the optical and gamma-ray luminosities, but the strength of the correlation depends on the type of the blazar. I will present some results from these studies in the context of current blazar variability and emission models.