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Title: "X-ray reverberation studies of AGN"

Dr. Dimitrios Emmanoulopoulos
School of Physics & Astronomy
University of Southampton
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When:  Wednesday, June 12 2013 at 1 p.m.
Where: 2nd Floor Seminar Room

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Abstract:

Detection of negative X-ray reverberation time delays (i.e. soft band X-ray variations lagging behind the corresponding hard band X-ray variations) in Seyfert galaxies, can yield significant information about the physical properties around the very near black hole (BH) environment. The physical origin of these delays is greatly debated, as is the question of their ubiquity in accretion systems. In the frame-work of the lamp-post geometry, I will be presenting X-ray time-lag modelling results using, for the first time, general relativistic (GR) transfer functions, yielding heights, viewing angles and BH spin parameters. All the relativistic effects on both the photon energies and trajectories e.g. aberration and light bending, are incorporated during the modelling improving significantly on the currently used parametrisation models of simple top-hat transfer functions.