XMM-Newton observation of the deep minimum state of PG 2112+059: A spectrum dominated by reflection from the accretion disk?

Abstract

We analyse a 75ks XMM-Newton observation of PG 2112+059 performed in November 2005 and compare it with a 15ks XMM-Newton observation taken in May 2003. PG 2112+059 was found in a deep minimum state as its 0.2-12 keV flux decreased by a factor of 10 in comparison to the May 2003 observation. During the deep minimum state the spectra show strong emission in excess of the continuum in the 3-6 keV region. The excess emission corresponds to an EW = 26.1 keV whereas its shape resembles that of heavily absorbed objects. The spectra of both observations of PG 2112+059 can be explained statistically by a combination of two absorbers where one shows a high column density, $N_H\sim 4.5\times 10^{23}c{m}^{-2}$, and the other high ionisation parameters. As the ionisation parameter of the high flux state, $\xi \sim 34ergcm{s}^{-1}$, is lower than the value found for the deep minimum state, $\xi \sim 110ergcm{s}^{-1}$, either the absorbers are physically different or the absorbing material is moving with respect to the X-ray source. The spectra can also be explained by a continuum plus X-ray ionised reflection on the accretion disk, seen behind a warm absorber. The ionisation parameter of the high state ($\xi \sim 5.6ergcm{s}^{-1}$) is higher than the ionisation parameter of the deep minimum state ($\xi \sim 0.2ergcm{s}^{-1}$), as expected for a stationary absorber. The values found for the ionisation parameters are in the range typical for AGNs. The spectra observed during the deep minimum state are reflection dominated and show no continuum emission. These can be understood in the context of light bending near the supermassive black hole as predicted by Minutti and Fabian.

arXiv comment13 pages, 3 figures, A&A latex, accepted for publication in Astronomy & Astrophysics

References in corpus (23)

• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• The XMM-Newton Optical/UV Monitor Telescope
• The Soft X-Ray Properties of a Complete Sample of Optically Selected Quasars II. Final Results
• The XMM-Newton view of PG quasars I. X-ray continuum and absorption
• Is the soft excess in AGN real?
• On the Nature of Soft X-ray Weak Quasi-Stellar Objects
• X-ray obscuration and obscured AGN in the local universe
• Occultation measurement of the size of the X-ray emitting region in the Active Galactic Nucleus of NGC 1365
• First Light Measurements with the XMM-Newton Reflection Grating Spectrometers: Evidence for an Inverse First Ionisation Potential Effect and Anomalous Ne A bundance in the Coronae of HR 1099
• Evidence for a multizone warm absorber in the XMM-Newton spectrum of Markarian 304
• X-ray reflection in the NLS1 1H 0707-495
• How the X-ray spectrum of a Narrow-Line Seyfert 1 galaxy may be reflection dominated
• XMM-Newton discovery of a sharp spectral feature at ~7 keV in the Narrow-Line Seyfert 1 galaxy 1H 0707-495
• The XMM-Newton Serendipitous Survey I. The role of XMM-Newton Survey Science Centre
• The Hubble Space Telescope Quasar Absorption Line Key Project XIII. A Census of Absorption Line Systems at Low Redshift
• X-ray reflection in the Seyfert galaxy 1H0419-577 revealing strong relativistic effects in the vicinity of a Kerr black hole
• Heavy X-ray Absorption in Soft X-ray Weak Active Galactic Nuclei
• The swansong in context: long-timescale X-ray variability of NGC 4051
• Dramatic X-ray Spectral Variability of the Broad Absorption Line Quasar PG2112+059
• Energy-dependent variability and the origin of the soft X-ray excess in AGN
• Resolving the large scale spectral variability of the luminous Seyfert 1 galaxy 1H 0419-577: Evidence for a new emission component and absorption by cold dense matter
• An XMM-Newton observation of the Seyfert 1 galaxy 1H 0419-577 in an extreme low state
• Investigating ionized disc models of the variable narrow-line Seyfert 1 PG 1404+226

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