State transition and flaring activity of IGR J17464-3213/H1743-322 with SPI/INTEGRAL telescope

Details State transition and flaring activity of IGR J17464-3213/H1743-322 with SPI/INTEGRAL telescope State transition and flaring activity of IGR J17464-3213/H1743-322 with SPI/INTEGRAL telescope

2005-05-19

arxiv.org/abs/astro-ph/0505410v1

Astrophys.J. 629 (2005) 1008-1016

Astronomy and Astrophysics

Astrophysics

26 pages, 7 figures, accepted for publication in Astrophysical Journal

Scientific paper

10.1086/431576

IGR J17464-3213, already known as the HEAO-1 transient source H1743-322, has been detected during a state transition by the SPI/INTEGRAL telescope. We describe the spectral evolution and flaring activity of IGR J17464-3213/H1743-322 from 2003 March 21 to 2003 April 22. During the first part, the source followed a continuous spectral softening, with the peak of the spectral energy distribution shifting from 100 keV down to a few keV. However the thermal disk and the hard X-ray components had a similar intensity, indicating that the source was in an intermediate state throughout our observations and evolving toward the soft state. In the second part of our observations, the ASM/RXTE and SPI/INTEGRAL light curve showed a strong flaring activity. Two flare events lasting about 1 day each have been detected with SPI and are probably due to instabilities in the accretion disk associated with the state transition. During these flares, the low (1.5-12 keV) and high (20-200 keV) energy fluxes monitored with ASM/RXTE and SPI/INTEGRAL, are correlated and the spectral shape (above 20 keV) remains unchanged while the luminosity increases by a factor greater than 2.

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