Beaklini , Pedro Paulo B.

Radio and polarimetric R band observations of 3C279 and PKS 1510-089.

Author list: Beaklini, P. B. B., Dominici, T., Abraham, Z.

We present the results of 3 years monitoring (2009-2012) of the quasars 3C279 and 1510-089. The radio observations were made with the Itapetinga Radiotelescope at 7 mm, while the polarimetric R band observations were performed in the Observatório Pico dos Dias, both in Brazil. In 3C279 we detected an increase in the flux density at 7 mm through the years, while the variability of the polarization degree at R band shows the existence of flares in 2009, 2010 and 2011, but only the 2011 flare was simultaneously with a gamma-ray flare detected by Fermi. In 1510-089, we observed an increase in the flux density at 7 mm starting in the second semester of 2011, at the same epoch at which several flares were detected at gamma-rays by Fermi. We interpreted this increase in the radio flux as a superposition of flares, consequence of the ejection of various components in the jet, evidenced by the flares at high energy. At polarimetric R band observations, we detected variability of the rotation angle in 2009, at the same time that the source become brighter at gamma-ray. This behavior can be explained by the formation of a new region of polarized emission.  In both sources we detected a correlation between the magnitude in the R band and the polarization degree, however, this correlation is more evident in 1510-089.