2006/11/07 by J. Rodriguez, J. Rodríguez, G. Pooley +8
Engineering · Physics and Astronomy · #Accretion (finance) #Astronomical Observations and Instrumentation #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics (astro-ph) #FOS: Physical sciences #Gamma-ray bursts and supernovae #Lambda #Optics #Physics #Radio telescope #Telescope #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0611218
published in arXiv (Cornell University) (Cornell University) · 7 pages, 7 figures, submitted to the proceedings of the INTEGRAL workshop, ESA pub. SP-622
arxiv created 2006/11/07 · openalex publication_date 2006/11/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/24 · openalex updated_date 2026/08/06
Since the launch of INTEGRAL in late 2002 we have monitored the Galactic\nmicroquasar GRS 1915+105 with long exposures (~100 ks) pointings. All the\nobservations have been conducted simultaneously with other instruments, in\nparticular RXTE and the Ryle Telescope, and in some cases with others (Spitzer,\nNancay, GMRT, Suzaku,...). We report here the results of 3 observations\nperformed simultaneously with INTEGRAL, RXTE, the Ryle and Nancay radio\ntelescopes. These observations show the so-called \ν and \λ classes\nof variability during which a high level of correlated X-ray and radio\nvariability is observed. We study the connection between the accretion\nprocesses seen in the X-ray behaviour, and the ejections seen in radio. By\nobserving ejection during class \λ, we generalise the fact that the\ndiscrete ejections in GRS 1915+105 occur after sequences of X-ray hard\ndips/soft spikes, and identify the most likely trigger of the ejection through\na spectral approach to our INTEGRAL data. We show that each ejection is very\nprobably the result of the ejection of a Comptonising medium responsible for\nthe hard X-ray emission seen above 15 keV with INTEGRAL. We study the rapid\nvariability of the source, an find that the Low Frequency Quasi-Periodic\nOscillations are present during the X-ray dips and show variable frequency. The\nubiquity of this behaviour, and the following ejection may suggest a link\nbetween the QPO and the mechanism responsible for the ejection\n