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The Demise of the Classical BLR in the Luminous Quasar PG1416-129
Jack W. Sulentic, Paolo Marziani, Tomaz Zwitter +2
New observations of the broad-line quasar PG1416-129 reveal a large decline in its continuum luminosity over the past ten years. In response to the continuum change the ``classical…
Eigenvector 1: An Optimal Correlation Space for Active Galactic Nuclei
J. W. Sulentic, T. Zwitter, P. Marziani +1
We identify a correlation space involving optical and UV emission line parameters as well as the soft X-ray spectral index that provides optimal discrimination between all principa…
Mapping IR Enhancements in Closely Interacting Spiral-Spiral Pairs. I. ISO~CAM and ISO~SWS Observations
Cong Xu, Yu Gao, Joseph Mazzarella +3
Mid-infrared (MIR) imaging and spectroscopic observations are presented for a well defined sample of eight closely interacting (CLO) pairs of spiral galaxies that have overlapping…
The Broad Line Region in Active Galactic Nuclei
D. Dultzin-Hacyan, P. Marziani, J. W. Sulentic
We review constraints on models of the broad line region that are imposed by observations of the emission lines in Active Galactic Nuclei. Comparison of high and low ionization lin…