Timing analysis of the Seyfert-1 galaxy MCG-6-30-15 with XMM-Newton data
  We present the main results of a deep timing analysis (in the 0.2-10 keV energy band) of the bright Seyfert-1 galaxy MCG-6-30-15 performed on XMM-Newton data. The light-curves and hardness ratios show that the source has large flux and spectral variations on time-scales of a few kiloseconds at most. From the analysis of both the power spectra and the structure function of the light curves we detected a relevant source variability between time-scales of ~0.3 and ~10 ks. Based on this result, we extracted a characteristic size of the X-ray emitting region of the order of 10^13 cm. 
N. La Palombara (1), S. Molendi (1), J. Wilms (2), C.S. Reynolds (3)   ((1) IASF/CNR, Sezione di Milano, Italy, (2) Institut...