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An X-ray QPO in the AGN RE J1034+396

Chris Done, durham

We present the discovery of the first significant (>3sigma) X-ray QPO in an AGN, the Narrow Line Seyfert 1 RE J1034+396. This strengthens arguments stressing the similarities in the physics of the accretion flow between supermassive and stellar mass black holes. However, such high mass accretion rate AGN have X-ray spectra that are rather unlike their scaled up black hole binary counterparts in that they have a strong 'soft X-ray excess'. RE J1034+396 has one of the biggest soft X-ray excesses ever detected, so here we use spectral and timing data to test models for the origin of this feature, and speculate on its connection to the QPO.