Spectral and Temporal Properties of MAXI J1836-194 during 2011 Outburst

A. Jana1*, D. Debnath1, S. Mondal1, S. K. Chakrabarti1,2, A. A. Molla1, D. Chatterjee1
1 Indian Centre for Space Physics, 43 Chalantika, Garia Station Road, Kolkata, 700084, India
2 S. N. Bose National Centre for Basic Sciences, JD-Block, Salt Lake, Kolkata, 700098, India

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We study black hole candidate (BHC) MAXI J1836-194 during its 2011 outburst with Two Component Advective Flow (TCAF) model using RXTE/PCU2 data in 2.5 − 25 keV band. From spectral fit, accretion flow parameters such as Keplerian disk rate (d), sub-Keplerian halo rate (h), shock location (Xs) and compression ratio (R) are extracted directly. During the entire phase of the outburst, quasi-periodic oscillations (QPOs) are observed sporadically. From the nature of the variation of accretion rate ratio (ARR=h / d) and QPOs, entire period of the outburst is classified in two spectral states, such as, hard (HS), hard-intermediate (HIMS). Unlike other transient BHCs, no signature of soft (SS) and soft-intermediate (SIMS) spectral states are observed during entire phase of the outburst.

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Keywords : black hole physics – accretion discs – stars: individual: MAXI J1836-194