Super-Eddington QSO RX J0439.6-5311. I. Origin of the Soft X-ray Excess and Structure of the Inner Accretion Flow

Abstract

We report the results from a recent 133 ks XMM-Newton observation of a highly super-Eddington narrow-line Type-1 QSO RX J0439.6-5311. This source has one of the steepest AGN hard X-ray slopes, in addition to a prominent and smooth soft X-ray excess. Strong variations are found throughout the 0.3 to 10 keV energy range on all time-scales covered by the observation, with the soft excess mainly showing low frequency variations below 0.1 mHz while the hard X-rays show stronger variability at higher frequencies. We perform a full set of spectral-timing analysis on the X-ray data, including a simultaneous modelling of the time-average spectra, frequency-dependent RMS and covariance spectra, lag-frequency and lag-energy spectra. Especially, we find a significant time-lag signal in the low frequency band, which indicates that the soft X-rays lead the hard by $\sim$4 ks, with a broad continuum-like profile in the lag spectrum. Our analysis strongly supports the model where the soft X-ray excess is dominated by a separate low temperature, optically thick Comptonisation component rather than relativistic reflection or a jet. This soft X-ray emitting region is several tens or hundreds of $R_g$ away from the hot corona emitting hard X-rays, and is probably associated with a geometrically thick (`puffed-up') inner disc region.

19 pages, 18 figures, 6 tables, accepted for publication in MNRAS

References in corpus (25)

• Super-critically accreting stellar-mass black holes as ultraluminous X-ray sources
• X-ray reverberation around accreting black holes
• A Global Three Dimensional Radiation Magneto-hydrodynamic Simulation of Super-Eddington Accretion Disks
• On why the Iron K-shell absorption in AGN is not a signature of the local Warm/Hot Intergalactic Medium
• X-ray Insights into the Nature of PHL 1811 Analogs and Weak Emission-Line Quasars: Unification with a Geometrically Thick Accretion Disk?
• Discovery of multiple Lorentzian components in the X-ray timing properties of the Narrow Line Seyfert 1 Ark 564
• Investigating the nature of narrow-line Seyfert 1 galaxies with high-energy spectral complexity
• Driving extreme variability: The evolving corona and evidence for jet launching in Markarian 335
• The variable X-ray spectrum of Markarian 766 - I. Principal components analysis
• Superorbital variability of X-ray and radio emission of Cyg X-1 - II. Dependence of the orbital modulation and spectral hardness on the superorbital phase
• The XMM-Newton view of AGN with intermediate mass black holes
• The Variable X-ray Spectrum of Markarian 766 - II. Time-Resolved Spectroscopy
• Energy-dependent variability and the origin of the soft X-ray excess in AGN
• The impact of accretion disk winds on the X-ray spectrum of AGN: Part 1 - XSCORT
• Modelling the Extreme X-ray Spectrum of IRAS 13224-3809
• Can the soft excess in AGN originate from disc reflection?
• Investigating the X-ray time-lags in PG 1244+026 using an extended corona model
• Modeling the Fe K Line Profiles in Type I AGN with a Compton-Thick Disk Wind
• A Physical Model for the X-ray Time Lags of Narrow Line Seyfert Type 1 Active Galactic Nuclei
• Radiation hydrodynamics simulations of wide-angle outflows from super-critical accretion disks around black holes
• Multiwavelength campaign on Mrk 509. XIII. Testing ionized-reflection models on Mrk 509
• The X-ray spectra of accreting Kerr black holes
• No Signatures of Black-Hole Spin in the X-ray Spectrum of the Seyfert 1 Galaxy Fairall 9
• Fourier-resolved energy spectra of the Narrow Line Seyfert 1 Mkn 766
• Complex Narrow Line Seyfert 1s: High spin or high inclination?

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