Search Publications
Short time-scale AGN X-ray variability with EXOSAT: black hole mass and normalized variability amplitude.
McHardy, I. M.
The old EXOSAT medium energy measurements of high-frequency (HF) active galactic nuclei (AGN) power spectral normalization are re-examined in the light of accurate black hole mass determinations which were not available when these data were first published by Green et al. It is found that the normalized variability amplitude (NVA), measured direct…
Observations of the High-mass X-Ray Binary A 0535+26 in Quiescence
Fürst, Felix; Pottschmidt, Katja; Wilms, Jörn +7 more
We have analyzed three observations of the high-mass X-ray binary A 0535+26 performed by the Rossi X-Ray Timing Explorer (RXTE) three, five, and six months after the last outburst in 2011 February. We detect pulsations only in the second observation. The 3-20 keV spectra can be fit equally well with either an absorbed power law or absorbed thermal…