658 citations · 9k across the 163 of their papers we have counts for
6 papers · 1 filter
Variability of the iron K-emission line in the Seyfert 1 galaxy NGC 3516
K. Nandra, R. F. Mushotzky, T. Yaqoob +2
We present strong evidence for variability of the flux of the iron K emission line in the Seyfert 1 galaxy, NGC 3516. Two ASCA observations, separated by ~yr, showed a m…
ASCA observations of Seyfert 1 galaxies: I. Data Analysis, Imaging and Timing
K. Nandra, I. M. George, R. F. Mushotzky +2
We present the first in a series of papers describing the X-ray properties of a sample of 18 Seyfert 1 galaxies, using data obtained by \asca. The imaging data reveal a number of s…
ASCA observations of Seyfert 1 galaxies: II. Relativistic Iron K-alpha emission
K. Nandra, I. M. George, R. F. Mushotzky +2
We present evidence for widespread relativistic effects in the central regions of active galactic nuclei. In a sample of 18 Seyfert 1 galaxies observed by \asca, 14 show an iron K$…
Multiwavelength observations of short time-scale variability in NGC 4151. III. X-ray and Gamma-ray observations
R. S. Warwick et al
A series of {\sl ROSAT\/}, {\sl ASCA\/} and Compton Gamma-Ray Observatory ({\sl CGRO\/}) observations of the Seyfert galaxy NGC 4151 were carried out during the period 1993 Novembe…
Multiwavelength observations of short time-scale variability in NGC 4151. IV. Analysis of multiwavelength continuum variability
R. A. Edelson et al
This paper combines data from the three preceding papers in order to analyze the multi-waveband variability and spectral energy distribution of the Seyfert~1 galaxy NGC~4151 during…
The X-Ray Spectral Variability of Mrk 766
K. M. Leighly, R. F. Mushotzky, T. Yaqoob +2
Analysis results from ASCA and ROSAT observations of the narrow-line Seyfert 1 galaxy Mrk 766 are reported. In the ASCA observation we observed rapid variability with a doubling ti…