Spectro-temporal evolution during the onset-phase of the 2011 outburst of IGR J17091-3624 – Implications on accretion disk dynamics

Nirmal Iyer1,2* and A. Nandi1
1Space Astronomy Group, SSIF, ISITE Campus, ISAC, Outer Ring Road, Marathahalli, Bangalore, India
2Dept. of Physics, Indian Institute of Science, Bangalore, India

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Abstract

We re-analysed the archival data of RXTE / INTEGRAL / Swift satellites at the onset phase of the 2011 outburst of the X-ray source IGR J17091-3624. The evolution of the spectral and temporal properties of the source in this phase clearly exhibits state transition as Hard (HS) → Hard- Intermediate (HIMS) → Soft-Intermediate (SIMS) → Soft (SS) state, before entering the variability phase (VP).We attempt to understand the evolution of X-ray features and the state transitions based on two different types of accreting material (i.e., the Keplerian and sub-Keplerian flow).

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Keywords : stars: individual: IGR J17091-3624 – methods: data analysis – black hole physics – radiation mechanisms: general