Variable X-ray reflection from 1H~0419--577

Abstract

We present detailed broadband X-ray spectral variability of a Seyfert 1 galaxy 1H~0419--577 based on an archival \suzaku{} observation in July 2007, a new \suzaku{} observation performed in January 2010 and the two latest \xmm{} observations from May 2010. All the observations show soft X-ray excess emission below $2\kev$ and both \suzaku{} observations show a hard X-ray excess emission above $10\kev$ when compared to a power-law. We have tested three physical models -- a complex partial covering absorption model, a blurred reflection model and an intrinsic disk Comptonization model. Among these three models, the blurred reflection model provided statistically the best-fit to all the four observations. Irrespective of the models used, the soft X-ray excess emission requires contribution from a thermal component similar to that expected from an accretion disk. The partial covering absorption model results in a nonphysical high temperature ($kT_{in} \sim 100\ev$) for an accretion disk and is also statistically the worst fit among the three models. 1H~0419--577 showed remarkable X-ray spectral variability. The soft X-ray excess and the power-law both became weaker in January 2010 as well as in May 2010. A moderately broad iron line, detected in July 2007, is absent in the January 2010 observation. Correlated variability of the soft X-ray excess and the iron $K\alpha$ line strongly suggest reflection origin for both the components. However, such spectral variability cannot be explained by the light bending model alone and requires changes in the accretion disk/corona geometry possibly arising from changes in the accretion rate.

accepted for publication in MNRAS, 13 pages including 7 figures

References in corpus (8)

• Simultaneous X-ray/optical/UV snapshots of active galactic nuclei from XMM-Newton: spectral energy distributions for the reverberation mapped sample
• Evidence for ultra-fast outflows in radio-quiet AGNs: III - location and energetics
• A Compton-thick Wind in the High Luminosity Quasar, PDS 456
• On why the Iron K-shell absorption in AGN is not a signature of the local Warm/Hot Intergalactic Medium
• An absorption origin for the X-ray spectral variability of MCG-6-30-15
• X-ray Absorption and Reflection in Active Galactic Nuclei
• 1H0707-495 in 2011: An X-ray source within a gravitational radius of the event horizon
• An investigation of the origin of soft X-ray excess emission from Narrow-line Seyfert 1 galaxies Akn564 and Mrk1044

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• On the Nature of the High-Energy Rollover in 1H 0419-577
• Chandra imaging of the $\sim$kpc extended outflow in 1H 0419-577
• Complex Optical/UV and X-ray Variability of the Seyfert 1 galaxy 1H 0419-577
• X-ray spectral and temporal analysis of Narrow Line Seyfert 1 galaxy Was 61