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We investigate the short-term variability properties and the power spectraldensity (PSD) of the Broad-Line Radio Galaxy (BLRG) 3C 390.3 using observationsmade by XMM, RXTE, and Suzaku on several occasions between October 2004 andDecember 2006. The main aim of this work is to derive model-independentconstraints on the origin of the X-ray emission and on the nature of thecentral engine in 3C 390.3. On timescales of the order of few hours, probed byuninterrupted XMM light curves, the flux of 3C 390.3 is consistent with beingconstant in all energy bands. On longer timescales, probed by the 2-day RXTEand Suzaku observations, the flux variability becomes significant. The latterobservation confirms that the spectral variability behavior of 3C 390.3 isconsistent with the spectral evolution observed in radio-quiet Seyfertgalaxies: the spectrum softens as the source brightens. The correlatedvariability between soft and hard X-rays, observed during the Suzaku exposureand between the 2 XMM pointings, taken 1 week apart, argues against scenarioscharacterized by the presence of two distinct variable components in the 0.5-10keV X-ray band. A detailed PSD analysis carried out over five decades infrequency suggests the presence of a break at T_br~43 days at a 92% confidencelevel. This is the second tentative detection of a PSD break in a radio-loud,non-jet dominated AGN, after the BLRG 3C120, and appears to be in generalagreement with the relation between T_br, M_BH, and L_bol, followed by Seyfertgalaxies. Our results indicate that the X-ray variability properties of 3C390.3 are broadly consistent with those of radio-quiet AGN, suggesting that theX-ray emission mechanism in 3C 390.3 is similar to that of nearby Seyfertgalaxies without any significant contribution from a jet component.

Short-term variability and PSD analysis of the radio-loud AGN 3C 390.3