Narrow-Line SY1 NGC 4748 in X-Rays: Detailed Case-Study

We analyze all the available X-ray data in order to monitor the narrow-line Seyfert 1 galaxy NGC 4748, namely XMM-Newton (EPIC and OM), INTEGRAL (ISGRI and JEM-X), and SWIFT (BAT and XRT) data to study both the wide-band 0.5–195 keV spectrum and light curves in details. To this aim, we use the autocorrelation analysis of the light curves, modeling the spectra with several physically-conditioned models in XSPEC software package. We find a fast quasiperiodic variation of the 0.5–10.0 keV flux on the timescales of kiloseconds in the XMM/EPIC composite light curve.