Cygnus X-1: shedding light on the spectral variability of a black hole
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Date
2013-07-18
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Citation of Original Publication
Grinberg, Victoria. “Cygnus X-1: Shedding Light on the Spectral Variability of a Black Hole.” In Proceedings of An INTEGRAL View of the High-Energy Sky (the First 10 Years) - 9th INTEGRAL Workshop and Celebration of the 10th Anniversary of the Launch — PoS(INTEGRAL 2012), 176:050. SISSA Medialab, 2013. https://doi.org/10.22323/1.176.0050.
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Attribution-NonCommercial-ShareAlike 1.0 Generic (CC BY-NC-SA 1.0)
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Abstract
The knowledge of the spectral state of a black hole is essential for the interpretation of data from
black holes in terms of their emission models. Based on pointed observations of Cyg X-1 with
the Rossi X-ray timing Explorer (RXTE) that are used to classify simultaneous RXTE-ASM
observations, we develop a scheme based on RXTE-ASM colors and count rates that can be used
to classify all observations of this canonical black hole that were performed between 1996 and
2011. We show that a simple count rate criterion, as used previously, leads to a significantly higher
fraction of misclassified observations. This scheme enables us to classify single INTEGRALIBIS science windows and to obtain summed spectra for the soft, intermediate and hard state with
low contamination by other states.