THE SOFT STATE OF CYGNUS X-1 OBSERVED WITH NuSTAR : A VARIABLE CORONA AND A STABLE INNER DISK

Abstract

We present a multi-epoch hard X-ray analysis of Cygnus X-1 in its soft state based on four observations with the Nuclear Spectroscopic Telescope Array (NuSTAR). Despite the basic similarity of the observed spectra, there is clear spectral variability between epochs. To investigate this variability, we construct a model incorporating both the standard disk… (More)

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