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What is the Origin of the Baldwin Effect in the BLR and the NLR?
Alexei Baskin, Ari Laor
The origin of the luminosity dependence of the strength of broad and narrow emission lines in AGN (i.e. the Baldwin effect) is not firmly established yet. We explore this question…
Some Comments related to AGN Radio Loudness
Ari Laor
The bimodality of the AGN radio loudness distribution, and the relation of radio loudness and black hole mass were recently disputed. A closer look at the existing data suggests po…
What is the Broad Line Region?
Ari Laor
What is the Broad Line Region (BLR) made of? What determines its location? Why is it sometimes missing? What controls its properties? Some recent results and new approaches which m…
Dramatic X-ray Spectral Variability of the Broad Absorption Line Quasar PG2112+059
S. C. Gallagher, W. N. Brandt, Beverley J. Wills +3
With a 1999 ASCA observation, PG2112+059 became notable as the first Broad Absorption Line (BAL) quasar found to exhibit a typical radio-quiet quasar X-ray continuum underlying a l…
On The Nature of Low Luminosity Narrow Line AGN
Ari Laor
There is clear observational evidence that some narrow line (type 2) AGN have a hidden broad line region (BLR), and are thus intrinsically broad line (type 1) AGN. Does this AGN un…