文章基本信息

标题：Broad-band parallel studies of Cygnus X-1 and GRS 1915+105
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作者：M. Cadolle Bel ; J. Rodriguez ; D. Hannikainen, S.,Shaw 等
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 present INTEGRAL, RXTE, MAGIC and radio data together with spectro-temporal analysis of these two famous BH binaries. Cygnus X-1 was seen by INTEGRAL during a bright event that occurred in 2006 September simultaneously with a detection at 0.1–1 TeV energies by the MAGIC telescope. The source was in a remarkably stable Low/Hard State over a few days, with however a flux as high as 2 Crab (∼3% of the Eddington luminosity). A similar hard flare lasting about 8 hours reached the maximum of 2 Crab in the 40–80 keV band on 2008 May 18. We compare the constraints derived in both cases on the accretion flow. In parallel, we summarize the results of a monitoring RXTE, INTEGRAL and Ryle campaign on GRS 1915+105: several discrete ejections occurred (seen for the 1st time in the lambda class) as a response to a hard X-ray dip and then a disappearance of the >18 keV emission. We identify the trigger of the ejection as an X-ray spike (energy and material accumulated then ejected) in several variability classes while a possible relation is found between the amplitude of the radio flare and the duration of the dip.