Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-01-23
Astrophys.J. 643 (2006) 376-380
Astronomy and Astrophysics
Astrophysics
13 pages, 6 figures, accepted for publication in The Astrophysical Journal
Scientific paper
10.1086/502641
IGR J17091-3624 was discovered in 2003 April by INTEGRAL/IBIS during its Galactic Centre Deep Exposure programme. The source was initially detectable only in the 40--100 keV range, but after two days was also detected in the 15-40 keV range. Its flux had by then increased to 40 mCrab and 25 mCrab in the 15-40 keV and 40-100 keV bands respectively. RXTE observed the source simultaneously on 2003 April 20, with an effective exposure of 2 ksec. We report here the spectral and temporal evolution of the source, which shows a transition between the hard and soft states. We analyse in detail the RXTE/INTEGRAL Comptonised spectrum of the hard state as well as the JEM-X detection of a blackbody component during the source softening. Even though the source spectral behaviour and time variability show a similarity with the outburst of the black-hole candidate IGR J17464-3213 (= H1743-322), observed by INTEGRAL in 2003, the nature of its compact object (BH vs. NS) remains controversial.
Bazzano Angela
Bird Andrew J.
Capitanio Fiamma
de Cesare Giovanni
Dean Anthony J.
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