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The X-ray–radio association in RATAN and RXTE monitoring of microquasar GRS 1915+105

Published online by Cambridge University Press:  01 August 2006

S. A. Trushkin ,
T. Kotani ,
N. Kawai ,
M. Namiki  and
S. N. Fabrika
S. A. Trushkin
Affiliation:
Special Astrophysical Observatory RAS, Nizhnij Arkhyz, 369167, Russia email: satr@sao.ru
T. Kotani
Affiliation:
Tokyo Tech, 2-12-1 O-okayama, Tokyo 152-8551, Japan, email: kotani@hp.phys.titech.ac.jp
N. Kawai
Affiliation:
Tokyo Tech, 2-12-1 O-okayama, Tokyo 152-8551, Japan email: kawai@hp.phys.titech.ac.jp
M. Namiki
Affiliation:
Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan email: namiki@ess.sci.osaka-u.ac.jp
S. N. Fabrika
Affiliation:
Special Astrophysical Observatory RAS, Nizhnij Arkhyz, 369167, Russia email: fabrika@sao.ru
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Abstract

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In the daily RATAN-600 monitoring of the radio variability of the microquasar GRS1915+105 we detected a clear correlation of the flaring radio emission and X-rays “spikes” at 2–12 keV emission (1–2 Crab) detected with RXTE (ASM data) during nine bright (200–600 mJy) radio flares in October 2005. The spectra of these flares in maximum were optically thick at ν<2.3 GHz and optically thin at ν≥2.3 GHz. During radio flares the spectra of the X-ray spikes became definitely softer than those of a quiescent radio state. Thus these data indicated transitions from very high/hard states to high/soft ones during which massive ejections are probably happened, and the ejections are detected as the radio flares.

Keywords

X-rays: binaries – radio continuum: stars – radiation 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. 461 - 462
Copyright
Copyright © International Astronomical Union 2007

References

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