1.2k citations · 6.4k across the 65 of their papers we have counts for
39 papers · 1 filter
An Expanded RXTE Survey of X-ray Variability in Seyfert 1 Galaxies
Alex Markowitz, Rick Edelson
The first seven years of RXTE monitoring of Seyfert 1 active galactic nuclei have been systematically analyzed to yield five homogeneous samples of 2-12 keV light curves, probing h…
Chandra observations of five X-ray transient galactic nuclei
S. Vaughan, R. Edelson, R. S. Warwick
We report on exploratory Chandra observations of five galactic nuclei that were found to be X-ray bright during the ROSAT all-sky survey (with L_X > 10^43 erg s^-1) but subsequentl…
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…