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

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dc.creatorStarling, R. L. C.
dc.creatorPuchnarewicz, E. M.
dc.creatorRomero-Colmenero, E.
dc.creatorMason, K. O.
dc.date2003-02-18
dc.date.accessioned2026-07-07T02:07:39Z
dc.date.available2026-07-07T02:07:39Z
dc.descriptionWe present a series of monitoring observations of the ultrasoft broad-line AGN 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 can be fit to the spectrum, but cannot be constrained. The best representation of the spectrum is a model consisting of two blackbodies (kT~90,200 eV) plus a power-law (Gamma=1.8). We also present simultaneous optical and infrared data showing that the optical spectral slope also changes 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 of ~1e8 solar, accretion rate ~0.8xEddington and disk inclination cosi>0.8.
dc.description6 pages, 6 figures, to appear in Advances in Space Research, proceedings of the 2002 COSPAR assembly at Houston, Texas, accepted
dc.identifierhttps://arxiv.org/abs/astro-ph/0302360
dc.identifierhttp://arxiv.org/abs/astro-ph/0302360
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/5763
dc.subjectAstrophysics
dc.titleThe optical to soft X-ray spectrum of the ultrasoft broad-line AGN RE J2248-511
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