Poster Title: X-ray-optical variability of MCG-6-30-15
Abstract: We examine the temporal behaviour of the Seyfert 1 galaxy MCG--6-30-15 through observations made by XMM-Newton with a total time span of 450 ks. The simultaneous X-ray and U filter light curves produced show variabilities of 50% and 15% on short time scales, respectively. Cross correlating the light curves we find a strong and well defined peak indicating that the X-rays lag the U photons by ~ 160 ks while no features with negative time lags were found. We found a steepening in the spectrum of the 2-10keV continuum with increasing flux, which together with the positive correlation peak give support to the Comptonization scenario. The lack of features with a negative time lag reject models where the bulk of the U photons are produced through reprocessing of X-rays for this source, at least in time scales shorter than the observation. These results put constraints in the emission mechanisms of Seyfert galaxies and so, possibly, on the accretion onto a super-massive black hole
Link to poster: N/A