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

Abstract : 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.
Type de document :
Communication dans un congrès
34th International Cosmic Ray Conference (ICRC2015), Jul 2016, The Hague, Netherlands. (2016) 727, PoS ICRC2015 727, 2016, 〈http://icrc2015.nl/〉
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http://hal.in2p3.fr/in2p3-01468108
Contributeur : Danielle Cristofol <>
Soumis le : mercredi 15 février 2017 - 11:06:20
Dernière modification le : jeudi 18 janvier 2018 - 01:55:53

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F. Schüssler, P. Bordas, P. M. Chadwick, H. Dickinson, J. -P. Ernenwein, et al.. Simultaneous H.E.S.S. and RXTE observations of the microquasars GRS 1915+105, Circinus X-1 and V4641 Sgr. 34th International Cosmic Ray Conference (ICRC2015), Jul 2016, The Hague, Netherlands. (2016) 727, PoS ICRC2015 727, 2016, 〈http://icrc2015.nl/〉. 〈in2p3-01468108〉

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