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4 papers · 1 filter
Phase Lags and Coherence of X-Ray Variability in Black Hole Candidates
Michael A. Nowak, Brian A. Vaughan
The ``low'' (hard or ``non-thermal'') state of black hole candidates is sometimes modelled via an optically thick, hot Compton cloud that obscures a softer input source such as an…
Toward a Unified View of Black Hole High Energy States
Michael A. Nowak
We present here a review of high energy (> 1 keV) observations of seven black hole candidates, six of which have estimated masses. In this review we focus on two parameters of inte…
ON THE GEOMETRY OF THE X-RAY EMITTING REGION IN SEYFERT GALAXIES
Boris E. Stern, Juri Poutanen, Roland Svensson +2
For the first time, detailed radiative transfer calculations of Comptonized X-ray and gamma-ray radiation in a hot pair plasma above a cold accretion disk are performed using two i…
NEW INSIGHTS INTO NON-RADIATIVE HEATING IN LATE-A STAR CHROMOSPHERES
Frederick M. Walter, Lynn D. Matthews, Jeffrey L. Linsky
Using new and archival spectra from the Goddard High Resolution Spectrograph, we have searched for evidence of chromospheric and transition region emission in six stars of mid- to…