Searching for the trigger of the AGN QPO: 8 years of RE J1034+396

Abstract

RE J1034+396 is one of the most extreme Narrow-line Seyfert 1s detected thus far, showing the only quasi-periodic oscillation (QPO) reliably detected in an Active Galactic Nucleus (AGN). Comparison with similar spectral and timing properties observed in the black hole X-ray binary (BHB) GRS 1915+105 suggests that RE J1034+396 is a super-Eddington accretor. A more complete understanding of the behaviour of RE J1034+396 can therefore lead to a unification of the accretion physics between such extreme AGN and super-Eddington BHBs. Here we report on our latest XMM-Newton observations of RE J1034+396, which no longer show the QPO, indicating that this source shows a non-stationary power-spectrum. We use spectral and temporal analysis across all five XMM-Newton observations of the source to probe the evolution of the object. The combination of the shape of the fractional variability with energy and the inferred velocity of absorbing material in the line-of-sight rules out an absorption-only method of creating the QPO. Instead the periodically changing absorption may be produced by the QPO causing a change in ionization state. We extend our analysis by including the covariance spectra which give much better signal to noise than an rms spectrum. These reveal a new aspect of the QPO, which is that there is also a small contribution from a soft component which is hotter than the soft excess seen in the mean spectrum. Folding the lightcurve on the QPO period shows that this component lags behind the hard X-rays. If this is due to re-processing then the lag corresponding to a light travel time across 30 R_g. Some of the remaining observations have similar energy spectra and covariance spectra, but none of them show a significant QPO, so we conclude that none of these features are the trigger for the appearance of the QPO in this object.

12 pages, 11 figures, accepted for publication in MNRAS

References in corpus (12)

• X-ray Properties of Black-Hole Binaries
• Piecing Together the X-ray Background: Bolometric Corrections for Active Galactic Nuclei
• Occultation measurement of the size of the X-ray emitting region in the Active Galactic Nucleus of NGC 1365
• On why the Iron K-shell absorption in AGN is not a signature of the local Warm/Hot Intergalactic Medium
• X-ray observations of ultraluminous X-ray sources
• The variability plane of accreting compact objects
• Spectral and Fourier analyses of X-ray QPO in accreting black holes
• Tracing a Disk Wind in NGC 3516
• An absorption origin for the soft excess in Seyfert 1 AGN
• High-frequency Quasi-Periodic Oscillations from GRS 1915+105 in its C state
• Evidence of a Warm Absorber that Varies with QPO Phase in the AGN RE J1034+396
• Modeling the time-resolved quasi-periodic oscillations in AGNs

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