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.
