086501

We propose an 855 ks openPar9x95 ksclosePar large program on the well-known narrow line Seyfert 1 galaxy comma RE J1034+396 comma in order to study the X-ray quasi-periodic oscillation openParQPOclosePar in unprecedented detail. These signatures of strong gravity are common to high accretion-rate processes across the mass range. The QPO in RE J1034+396 is already confirmed in 6 XMM-Newton observations comma though 4 of these are too short to study the feature at high frequency resolution. We will conclusively measure the harmonic oscillation and use spectral- timing methods to place important constraints on the underlying physical QPO mechanism. We will also use the dynamics of this feature to provide insight into the accretion-ejection processes associated with high- Eddington rates. This is an observation only XMM-Newton can make