文章基本信息

标题：An INTEGRAL monitoring of GRS 1915+105 using simultaneous space and ground based instruments
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作者：J. Rodriguez ; G.G Pooley ; D. Hannikainen, H.J.,Lehto 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2006
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report the results of 3 observations of GRS 1915+105 duringwhich the source is found to show the X-ray dips/spike sequences (cycles). These observations were performed simultaneously with INTEGRAL, RXTE, the Ryle and Nançay radio telescopes. They show the so-called n, l and b classes of variability during which a high level of correlated X-ray and radio variability is observed. We study the connection between the accretion processes seen in the X-ray behaviour, and the ejections seen in radio. By observing ejection during class l , we generalise the fact that the discrete ejections in GRS 1915+105 occur after the cycles seen at X-ray energies, and identify the most likely trigger of the ejection through a spectral approach to our INTEGRAL data. We show that each ejection is very probably the result of the ejection of a Comptonising medium responsible for the hard X-ray emission seen above 15 keV with INTEGRAL. We study the rapid variability of the source, and observe the presence of Low Frequency Quasi Periodic Oscillations during the X-ray dips. The ubiquity of the former behaviour, and the following ejection may suggest a link between the QPO and the mechanism responsible for the ejection.