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Broad Absorption Line Quasars in the Early Data Release from the Sloan Digital Sky Survey
Alin Tolea, Julian H. Krolik, Zlatan Tsvetanov
A new broad absorption line quasar (BAL) sample is derived from the first data released by the Sloan Digital Sky Survey. With 116 objects, it is the largest BAL sample yet assemble…
The X-ray Reflectors in the Nucleus of the Seyfert Galaxy NGC 1068
Edward Colbert, Kim Weaver, Julian Krolik +2
(abridged) Based on observations of the Seyfert nucleus in NGC1068 with ASCA, RXTE and BeppoSAX, we report the discovery of a flare (increase in flux by a factor of ~1.6) in the 6.…
High Resolution X-ray Spectroscopy and the Nature of Warm Absorbers in AGN
Julian H. Krolik
Although soft X-ray absorption features in AGN were discovered almost ten years ago, the nature and location of the gas creating them has remained controversial. However, by making…
Where is the Inner Edge of an Accretion Disk Around a Black Hole?
Julian H. Krolik, John F. Hawley
What is meant by the "inner edge" of an accretion disk around a black hole depends on the property that defines the edge. We discuss four such definitions using data from recent hi…
Unusual Broad Absorption Line Quasars from the Sloan Digital Sky Survey
Patrick B. Hall, S. F. Anderson, M. A. Strauss +6
The Sloan Digital Sky Survey has confirmed the existence of populations of broad absorption line (BAL) quasars with various unusual properties. We present and discuss twenty-three…