Aneta Siemiginowska Editor

Keith Arnaud is at the Center for Research Excellence in Space Science and Technology, NASA Goddard Space Flight Center, and is an Associate Research Scientist in the Astronomy Department, University of Maryland. A veteran of x-ray astronomy, he is recognized world-wide as an expert on data analysis techniques. Randall Smith is an astrophysicist in the High Energy Astrophysics Division of the Smithsonian Astrophysical Observatory. He is internationally known for his work on spectral emission from astrophysical plasmas and the underlying issues of atomic physics. Aneta Siemiginowska is an astrophysicist in the High Energy Astrophysics Division of the Smithsonian Astrophysical Observatory. She has worked in both theoretical and observational aspects of x-ray astronomy with interests in extra galactic radio sources, quasars, powerful jets and statistical methods.