4 papers
A high velocity ionised outflow and XUV photosphere in the narrow emission line quasar PG1211+143
K. A. Pounds, J. N. Reeves, A. R. King +3
We report on the analysis of a ~60 ksec XMM observation of the bright, narrow emission line quasar PG 1211+143. Absorption lines are seen in both EPIC and RGS spectra corresponding…
Observing the Unobservable: Coronal Line Data from NLS1s as a Test of EUV Continuum Models
P. J. Bleackley, P. T. O'Brien
We have measured coronal line emission for a sample of 19 Narrow-Line Seyfert~1 galaxies. Kinematic analysis shows that the Coronal Line Region (CLR) consists of gas in a decelerat…
Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VI. Variability of NGC 3783 from ground-based data
G. M. Stirpe
The Seyfert 1 galaxy NGC 3783 was intensely monitored between 1991 December and 1992 August. We present the results from the ground-based observations in the optical and near-IR, w…
Multiwavelength Monitoring of the BL Lac Object PKS 2155-304 I. The IUE Campaign
C. M. Urry
Daily monitoring of PKS 2155-304 with the IUE satellite throughout November 1991 has revealed dramatic, large-amplitude, rapid variations in the ultraviolet flux of this BL Lac obj…