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Title:
Flaring variability of Microquasars
Authors:
Trushkin, Sergei A.; Bursov, Nikolaj N.; Nizhelskij, Nikolaj A.
Affiliation:
Special Astrophysical Observatory RAS, Nizhnij Arkhyz, 369167, Russia
Publication:
OBSERVATIONAL EVIDENCE FOR BLACK HOLES IN THE UNIVERSE: Proceedings of the 2nd Kolkata Conference on Observational Evidence for Black Holes in the Universe held in Kolkata India, 10-15 February 2008 and the Satellite Meeting on Black Holes, Neutron Stars, and Gamma-Ray Bursts held 16-17 February 2008. AIP Conference Proceedings, Volume 1053, pp. 219-224 (2008). (AIPC Homepage)
Publication Date:
10/2008
Origin:
AIP
PACS Keywords:
Quasars, X-ray binaries, Astronomical catalogs, atlases, sky surveys, databases, retrieval systems, archives, etc.
DOI:
10.1063/1.3009486
Bibliographic Code:
2008AIPC.1053..219T

Abstract

We discuss flaring variability of radio emission of microquasars, measured in monitoring programs with the RATAN-600 radio telescope. We carried out a multi-frequency (1-30 GHz) daily monitoring of the radio flux variability of the microquasars SS433, GRS1915+105, and Cyg X-3 during the recent sets in 2005-2007. A lot of bright short-time flares were detected from GRS 1915+105 and they could be associated with active X-ray events. In January 2006 we detected a drop down of the quiescent fluxes from Cyg X-3 (from 100 to ~20 mJy), then the 1 Jy-flare was detected on 2 February 2006 after 18 days of quenched radio emission. The daily spectra of the flare in the maximum were flat from 2 to 110 GHz, using the quasi-simultaneous observations at 110 GHz with the RT45m telescope and the NMA millimeter array of NRO in Japan. Several bright radio flaring events (1-15 Jy) followed during the continuing state of very variable and intensive 1-12 keV X-ray emission (~0.5 Crab), which was monitored in the RXTE ASM program. Swift/BAT ASM hard X-ray fluxes correlated strongly with flaring radio data. The various spectral and temporal characteristics of the light curves from the microquasars could be determined from such comparison. We conclude that monitoring of the flaring radio emission is a good tracer of jet activity X-ray binaries.
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