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The X-ray Variability of NGC 4945: Characterizing the Power Spectrum through Light Curve Simulations
Martin Mueller, Greg Madejski, Chris Done +1
For light curves sampled on an uneven grid of observation times, the shape of the power density spectrum (PDS) includes severe distortion effects due to the window function, and si…
XMM-Newton observations of 3C 273
K. L. Page, M. J. L. Turner, C. Done +4
A series of nine XMM-Newton observations of the radio-loud quasar 3C 273 are presented, concentrating mainly on the soft excess. Although most of the individual observations do not…
Is the soft excess in AGN real?
Marek Gierlinski, Chris Done
We systematically analyse all publicly available XMM-Newton spectra of radio-quiet PG quasars. The soft X-ray excess in these objects is well modelled by an additional, cool, Compt…
GRS 1915+105: The brightest Galactic black hole
C. Done, G. Wardzinski, M. Gierlinski
We compare the evolution of spectral shape with luminosity in GRS 1915+105 with that of 'normal' black holes. The pathological time variability of GRS 1915+105 does not indicate th…
Black hole accretion discs: reality confronts theory
Marek Gierlinski, Chris Done
Disc spectra from highly luminous black hole binaries are observed to be rather simple, despite theoretical predictions to the contrary. We collate the disc-dominated spectra from…
Simultaneous Chandra and RXTE observations of the nearby bright Seyfert 2 galaxy NGC4945
Chris Done, Greg M. Madejski, Piotr T. Zycki +1
We analyze recent simultaneous Chandra/RXTE observations of the Seyfert 2 galaxy NGC 4945. The unprecedented spatial resolution of Chandra means we are able to separate the spectra…