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- W3103661837 abstract "We report on the first 180 days of Rossi X-Ray Timing Explorer observations of the outburst of the black hole candidate IGR J17091–3624. This source exhibits a broad variety of complex light curve patterns including periods of strong flares alternating with quiet intervals. Similar patterns in the X-ray light curves have been seen in the (up to now) unique black hole system GRS 1915+105. In the context of the variability classes defined by Belloni et al. for GRS 1915+105, we find that IGR J17091–3624 shows the ν, ρ, α, λ, β, and μ classes as well as quiet periods which resemble the χ class, all occurring at 2–60 keV count rate levels which can be 10–50 times lower than observed in GRS 1915+105. The so-called ρ class heartbeats occur as fast as every few seconds and as slow as ∼100 s, tracing a loop in the hardness–intensity diagram which resembles that previously seen in GRS 1915+105. However, while GRS 1915+105 traverses this loop clockwise, IGR J17091–3624 does so in the opposite sense. We briefly discuss our findings in the context of the models proposed for GRS 1915+105 and find that either all models requiring near Eddington luminosities for GRS 1915+105-like variability fail, or IGR J17091–3624 lies at a distance well in excess of 20 kpc, or it harbors one of the least massive black holes known (<3 M☉)." @default.
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- W3103661837 date "2011-11-04" @default.
- W3103661837 modified "2023-10-06" @default.
- W3103661837 title "THE FAINT “HEARTBEATS” OF IGR J17091−3624: AN EXCEPTIONAL BLACK HOLE CANDIDATE" @default.
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- W3103661837 doi "https://doi.org/10.1088/2041-8205/742/2/l17" @default.
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