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 10 8 M ˙ , accretion rate 0.8 M ˙ Edd and inclination cos(i)⩾0.8 of the disk.


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    Title :

    The optical to X-ray spectrum of the broad-line ultrasoft AGN RE J2248-511


    Contributors:

    Published in:

    Advances in Space Research ; 34 , 12 ; 2588-2593


    Publication date :

    2003-02-18


    Size :

    6 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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