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Flaring activity of microquasars from multi-frequency daily monitoring program with RATAN-600 radio telescope

Published online by Cambridge University Press:  01 August 2006

S. A. Trushkin ,
N. A. Nizhelskij ,
N. N. Bursov  and
E. K. Majorova
S. A. Trushkin
Affiliation:
Special Astrophysical Observatory RAS, Nizhnij Arkhyz, 369167, Russia email: satr@sao.ru
N. A. Nizhelskij
Affiliation:
Special Astrophysical Observatory RAS, Nizhnij Arkhyz, 369167, Russia email: satr@sao.ru
N. N. Bursov
Affiliation:
Special Astrophysical Observatory RAS, Nizhnij Arkhyz, 369167, Russia email: satr@sao.ru
E. K. Majorova
Affiliation:
Special Astrophysical Observatory RAS, Nizhnij Arkhyz, 369167, Russia email: satr@sao.ru
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Abstract

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We report about the multi-frequency (1–30 GHz) daily monitoring of the radio flux variability of the three microquasars: SS433, GRS1915+105 and Cyg X-3 during 2005–2006. After a quiescent radio emission we have detected a drop down of the fluxes (∼20 mJy) from Cyg X-3, a sign of the following bright flare, and indeed a 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 was found flat from 2 to 110 GHz, using the quasi-simultaneous observations at 109 GHz with the RT45m telescope and the NMA millimeter array of Nobeyama Radio Observatory in Japan. Several bright radio flaring events (1–15 Jy) followed during the state of highly variable and intense 1–12 keV X-ray emission (∼0.5 Crab), monitored in the RXTE ASM program. We discussed various spectral and temporal characteristics of the detected 180 day light curves from three microquasars in comparison with the Rossi XTE ASM data.

Keywords

X-rays: binariesradio continuum: starsradiation mechanisms: nonthermal
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 463 - 464
Copyright
Copyright © International Astronomical Union 2007

References

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