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Long-Term X-ray Spectral Variability in Seyfert 1 Galaxies
A. Markowitz, R. Edelson, S. Vaughan
Direct time-resolved spectral fitting has been performed on continuous RXTE monitoring of seven Seyfert 1 galaxies in order to study their broadband spectral variability and Fe K a…
On characterising the variability properties of X-ray light curves from active galaxies
S. Vaughan, R. Edelson, R. S. Warwick +1
We review some practical aspects of measuring the amplitude of variability in `red noise' light curves typical of those from Active Galactic Nuclei (AGN). The quantities commonly u…
Contrasting the UV and X-ray O VI Column Density Inferred for the Outflow in NGC 5548
Nahum Arav, Jelle Kaastra, Katrien Steenbrugge +4
We compare X-ray and UV spectroscopic observations of NGC 5548. Both data sets show O VI absorption troughs associated with the AGN outflow from this galaxy. We find that the robus…
XMM-NEWTON High Resolution Spectroscopy of NGC 5548
K. C. Steenbrugge, J. S. Kaastra, C. P. de Vries +1
We analyze a 137 ks exposure X-ray spectrum of the Seyfert 1 galaxy NGC 5548 obtained with the XMM-Newton Reflection Grating Spectrometer. Due to the long exposure time, the spectr…
Correlated long-term optical and X-ray variations in NGC 5548
Phil Uttley, Rick Edelson, Ian McHardy +2
We combine the long-term optical light curve of the Seyfert 1 galaxy NGC5548 with the X-ray light curve measured by the Rossi X-ray Timing Explorer over 6 years, to determine the r…