Physical Interpretation of the UV/X-Ray Variability Behavior of NGC 7469(Poster)

概要

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We present a re-analysis of the simultaneous 30 day IUE/XTE observation of NGC 7469 done in 1996 using a detailed Comptonization model. Our results are completely consistent with a slab geometry where all the observed UV emission is supposed to cross the corona. The UV seed photon emission appears to be dominated by the reprocessing of the X-rays. We found a strong anticorrelation between the corona temperature and the UV flux. Such an anticorrelation is clearly inconsistent with a fixed disc-corona configuration and suggests a variation of the geometry of the system. We also find a correlation between the corona optical depth and the X-ray flux which may reflect processes linked to the corona formation. During the observations, NGC 7469 appears to accrete near its Eddington limit. This source could then be an example of magnetically dominated disc-corona system.
2004-11-15