298 citations · 2k across the 42 of their papers we have counts for
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astro-ph.HE2015★ 14 cited
Quasi periodic oscillations in active galactic nuclei
William Alston, Andy Fabian, Julija Markeviciute +3
Quasi-periodic oscillations (QPOs) are coherent peaks of variability power observed in the X-ray power spectra (PSDs) of stellar mass X-ray binaries (XRBs). A scale invariance of t…
astro-ph.HE2015★ 31 cited
X-ray time lags and nonlinear variability in the ultraluminous X-ray sources NGC 5408 X-1 and NGC 6946 X-1
L. Hernández-García, S. Vaughan, T. P. Roberts +1
We present our analysis of the X-ray variability of two ultraluminous X-ray sources (ULXs) based on multiple XMM--Newton observations. We show the linear rms-flux relation is prese…