AbstractWe present a series of monitoring observations of the ultrasoft broad-line Seyfert galaxy RE J2248-511 with XMM-Newton. Previous X-ray observations showed a transition from a very soft state to a harder state five years later. We find that the ultrasoft X-ray excess has re-emerged, yet there is no change in the hard power-law. Reflection models with a reflection fraction of ⩾15, and Comptonisation models with two components of different temperatures and optical depths (kT1=83 keV, T1=30 eV, τ1=0.8; KT2=3.5 keV, T2=60 eV, τ2=2.8) can be fit to the spectrum, but cannot be constrained. The best representation of the spectrum is a model consisting of two blackbodies (kT1=0.09±0.01 keV, kT2=0.21±0.03 keV) plus a power-law (Γ=1.8±0.08). We also present simultaneous optical and infrared data showing that the optical spectral slope also changes dramatically on timescales of years. If the optical to X-ray flux comes primarily from a Comptonised accretion disk we obtain estimates for the black hole mass , accretion rate and inclination cos(i)⩾0.8 of the disk.
The optical to X-ray spectrum of the broad-line ultrasoft AGN RE J2248-511
Advances in Space Research ; 34 , 12 ; 2588-2593
2003-02-18
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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