Cygnus X-1: shedding light on the spectral variability of a black hole
| Autor: | Grinberg, V., Hell, N., Wilms, J., Rodriguez, J., Pottschmidt, K., Nowak, M. A., Böck, M., Bodaghee, A., Bel, M. Cadolle, Fürst, F., Hanke, M., Kühnel, M., Laurent, P., Markoff, S. B., Markowitz, A., Marcu, D. M., Pooley, G. G., Popp, A., Rothschild, R. E., Tomsick, J. A. |
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| Rok vydání: | 2013 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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 INTEGRAL-IBIS science windows and to obtain summed spectra for the soft, intermediate and hard state with low contamination by other states. Comment: Figures 2&4 in reduced quality, see http://arxiv.org/abs/1303.1198 for similar figures in pdf-quality; Proceedings of "An INTEGRAL view of the high-energy sky (the first 10 years)" the 9th INTEGRAL Workshop, October 15-19, 2012, Paris, France, in Proceedings of Science (INTEGRAL 2012), Eds. A. Goldwurm, F. Lebrun and C. Winkler, (http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=176), id 050 |
| Databáze: | arXiv |
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