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Spectral variability modes of GX 339−4 in a hard-to-soft state transition

By Melania Del Santo, Julien Malzac, Pietro Ubertini and Tomaso Belloni


We report on INTEGRAL observations performed during the 2004 outburst of the bright black hole transient GX 339−4. We analysed IBIS and JEM-X public data starting on 9th August and lasting about one month. During this period GX 339−4 showed spectral state transitions. In order to seek for variability patterns, a principal component analysis (PCA) has been used

Year: 2006
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