Seminar of the Institue of Physics - Angelos Karakonstantakis (CAMK) : Long term X-ray time-lags studies

• ustav
• 21.10.2021

The X-ray emission from AGN is highly variable, on short (minutes/hours/day) and long (months/years) time scales. A particular characteristic of the observed variations is that the higher energy band variations are delayed with respect to lower energy photons. I will present the long term, frequency dependent, X-ray time-lags of the Seyfert galaxies NGC 4051, MCG-6-30-15, Ark 564 and Mkn 766 in the 2-4, 4-7, and 7-10 keV bands. I will combine these results with the results from the model fitting of the time lags at higher frequencies to investigate if these delays at low frequencies are consisted with the time-lag estimates at higher frequencies. Seminar At the institute of physics in the Directorate Boardroom.