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Broad iron L line and x-ray reverberation in 1H0707-495

By A. Zoghbi, A.C. Fabian, Philip Uttley, G. Miniutti, L.C. Gallo, C.S. Reynolds, J.M. Miller and Gabriele Ponti


A detailed analysis of a long XMM-Newton observation of the narrow-line type 1 Seyfert galaxy 1H0707-495 is presented, including spectral fitting, spectral variability and timing studies. The two main features in the spectrum are the drop at ?7?keV and a complex excess below 1?keV. These are well described by two broad, K and L, iron lines. Alternative models based on absorption, although they may fit the high-energy drop, cannot account for the 1?keV complexity and the spectrum as a whole. <br/><br/>Spectral variability shows that the spectrum is composed of at least two components, which are interpreted as a power law dominating between 1-4?keV and a reflection component outside this range. The high count rate at the iron L energies has enabled us to measure a significant soft lag of ?30 s between 0.3-1 and 1-4?keV, meaning that the direct hard emission leads the reflected emissions. We interpret the lag as a reverberation signal originating within a few gravitational radii of the black hole. <br/

Topics: QB, QC
Year: 2009
OAI identifier: oai:eprints.soton.ac.uk:144549
Provided by: e-Prints Soton
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