Simultaneous H.E.S.S. and RXTE observations of the microquasars GRS 1915+105, Circinus X-1 and V4641 Sgr

F. Schüssler, P. Bordas, P. M. Chadwick, H. Dickinson, J. P. Ernenwein

Research output: Contribution to journalConference articlepeer-review


Microquasars, Galactic binary systems showing extended and variable radio emission, are potential gamma-ray emitters. Indications of gamma-ray transient episodes have been reported in at least two systems, Cyg X-1 and Cyg X-3. The identification of additional gamma-ray emitting microquasars is key for a better understanding of these systems. Very-high-energy gamma-ray emission from microquasars has been predicted to happen during periods of transient outbursts potentially connected with the formation of a jet-like outflow. Contemporaneous observations using the H.E.S.S. telescope array and the RXTE satellite were obtained on three microquasars: GRS 1915+105, Circinus X-1 and V4641 Sgr with the aim of detecting a broadband flaring event in the very-high-energy gamma-ray and X-ray bands. We report here on the analysis of these data for each system, including a detailed X-ray analysis assessing the location of the sources in a hardness-intensity diagram during the observations. Finally we discuss the derived upper limits on their very-high-energy gamma-ray flux. The analyses presented here will soon be the subject of a detailed publication of the H.E.S.S. Collaboration [1].

Original languageEnglish (US)
Article number727
JournalProceedings of Science
StatePublished - 2015
Event34th International Cosmic Ray Conference, ICRC 2015 - The Hague, Netherlands
Duration: Jul 30 2015Aug 6 2015


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