Date:
Tue, 24/03/200912:15-13:15
Location:
Kaplun Bldg, seminar room, 2nd floor
Fluctuation analyses and the Mass-Timescale relation in AGN and other Black Holes
We use the Structure-Function (SF) method to analyse X-ray fluctuations in RXTE and NXMM data of about 20 Seyfert nuclei. Linear correlation is found between the break-timescale in the fluctuation spectrum (Tb) and the black hole mass Mbh. The robustness of the SF method enables us to double the data set available by the power spectral density method and the resulting correlation between X-ray spectral break and Mbh (e.g. McHardy 2004;06). The Mbh-Tb correlation seems to extrapolate to lower masses, e.g. to Cyg X-1 other Galactic BHs and to low mass AGNs. This may predict a common physical mechanism for X-ray variability in accreting BHs of stellar mass and AGNs.
We use the Structure-Function (SF) method to analyse X-ray fluctuations in RXTE and NXMM data of about 20 Seyfert nuclei. Linear correlation is found between the break-timescale in the fluctuation spectrum (Tb) and the black hole mass Mbh. The robustness of the SF method enables us to double the data set available by the power spectral density method and the resulting correlation between X-ray spectral break and Mbh (e.g. McHardy 2004;06). The Mbh-Tb correlation seems to extrapolate to lower masses, e.g. to Cyg X-1 other Galactic BHs and to low mass AGNs. This may predict a common physical mechanism for X-ray variability in accreting BHs of stellar mass and AGNs.