文章基本信息

标题：Spectral state transitions in GX 339-4
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作者：M. Del Santo
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2008
卷号：2008
期号：(02)
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report on INTEGRAL observations of the bright black-hole transient GX 339􀀀4 performed during the 2004 outburst. Our data cover three different spectral states, namely Hard/Intermediate State (HIMS), Soft/Intermediate State (SIMS), High/Soft State (HSS). Fits of joint IBIS, SPI and JEM-X data are well represented by hybrid thermal/non-thermal Comptonization (EQPAIR) and allow us to track the evolution of each spectral component during the transitions. Furthermore, spectra of GX 339􀀀4 in the HIM state show a high energy excess with respect to pure thermal Comptonization models. We present a summary of these results, extensively discussed in a recently published work, as well as, a comparison of the 2004 transition with a "secondary" transition HIMS-to-SIMS observed during the 2007 outburst with RXTE and INTEGRAL, simultaneously.