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Spectral evolution of the galactic microquasars XTE J1550-564 and GRO J1655-40 during outbursts

Published online by Cambridge University Press:  24 February 2011

Alexander A. Lutovinov ,
Sergei S. Tsygankov ,
Vadim A. Arefiev  and
Mikhail G. Revnivtsev
Alexander A. Lutovinov
Affiliation:
Space Research Institute, Profsoyuznaya str. 84/32, Moscow 117997, Russia email: aal@iki.rssi.ru
Sergei S. Tsygankov
Affiliation:
Space Research Institute, Profsoyuznaya str. 84/32, Moscow 117997, Russia email: aal@iki.rssi.ru Max-Plank Institute für Astrophysik, Karl-Schwarzschild str. 1, Garching 85741, Germany
Vadim A. Arefiev
Affiliation:
Space Research Institute, Profsoyuznaya str. 84/32, Moscow 117997, Russia email: aal@iki.rssi.ru
Mikhail G. Revnivtsev
Affiliation:
Space Research Institute, Profsoyuznaya str. 84/32, Moscow 117997, Russia email: aal@iki.rssi.ru
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Abstract

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We present results of a broadband spectroscopy of the galactic microquasars and black hole candidates XTE J1550-564 and GRO J1655-40, performed with the INTEGRAL and RXTE observatories during strong outbursts in 2003 and 2005, respectively. The spectral parameters evolution was traced during brightening and fading phases of each outburst to search a possible hysteresis and transitions from state to state. We estimated a size and optical depth of different regions around XTE J1550-564, like a hot plasma zone and optically thick accretion disk. Upper limits to the annihilation 511 keV line emission were obtained for both sources using data of the SPI spectrometer onboard the INTEGRAL observatory.

Keywords

X-ray transientsblack holesmicroquasarsjets
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S275: Jets at all Scales , September 2010 , pp. 321 - 322
Copyright
Copyright © International Astronomical Union 2011

References

Arefiev, V., Revnivtsev, M., Lutovinov, A., & Sunyaev, R. 2004, Astron. Letters, 30, 669CrossRefGoogle Scholar
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Poutanen, Yu. & Svensson, R. 1996, Astrophys. J., 470, 249CrossRefGoogle Scholar
Tsygankov, S. & Churazov, E. 2010, Astron. Letters, 36, 237CrossRefGoogle Scholar