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Abstract: We discuss flaring variability of radio emission of microquasars, measured inmonitoring programs with the RATAN-600 radio telescope. We carried out amulti-frequency 1-30 GHz daily monitoring of the radio flux variability ofthe microquasars SS433, GRS1915+105, and Cyg X-3 during the recent sets in2005-2007. A lot of bright short-time flares were detected from GRS 1915+105and they could be associated with active X-ray events. In January 2006 wedetected a drop down of the quiescent fluxes from Cyg X-3 from 100 to $\sim$20mJy, then the 1 Jy-flare was detected on 2 February 2006 after 18 days ofquenched radio emission. The daily spectra of the flare in the maximum wereflat from 2 to 110 GHz, using the quasi-simultaneous observations at 110 GHzwith the RT45m telescope and the NMA millimeter array of NRO in Japan. Severalbright radio flaring events 1-15 Jy followed during the continuing state ofvery variable and intensive 1-12 keV X-ray emission $\sim$0.5 Crab, which wasmonitored in the RXTE ASM program. Swift-BAT ASM hard X-ray fluxes correlatedstrongly with flaring radio data. The various spectral and temporalcharacteristics of the light curves from the microquasars could be determinedfrom such comparison. We conclude that monitoring of the flaring radio emissionis a good tracer of jet activity X-ray binaries.



Author: Sergei A. Trushkin, Nikolaj N. Bursov, Nikolaj A. Nizhelskij SAO RAS

Source: https://arxiv.org/







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