An INTEGRAL monitoring of GRS 1915+105 using simultaneous space and ground based instruments

Details An INTEGRAL monitoring of GRS 1915+105 using simultaneous space and ground based instruments An INTEGRAL monitoring of GRS 1915+105 using simultaneous space and ground based instruments

2006-11-07

arxiv.org/abs/astro-ph/0611219v1

PoS MQW6:024,2006

Astronomy and Astrophysics

Astrophysics

10 pages, 7 figures, proceedings of the microquasar workshop held in Como, Italy, Sept. 18-22, 2006. Eds T. Belloni

Scientific paper

We report the results of 3 observations of GRS 1915+105 during which the source is found to show the X-ray dips/spike sequences (cycles). These observations were performed simultaneously with \integral, RXTE, the Ryle and Nancay radio telescopes. They show the so-called $\nu$, $\lambda$ and $\beta$ 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 $\lambda$, 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.

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