AC1 - Accretion Processes onto Black Holes: Observation and Modeling |
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Speaker |
Debnath, Dipak |
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Coauthors |
Molla, Aslam Ali; Chakrabarti, Sandip K.; Mondal, S.; Jana, A.; Chatterjee, D. |
| Talk Title |
Timing and Spectral Properties of MAXI J1659-152 during its 2010 Outburst |
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Abstract |
One of the great interesting features of transient black hole candidates (BHCs) is their outburst profile, because they show rapid spectral and timing variability in a very short time scale. A systematic detailed study on the Spectral and the Timing properties on a daily basis is necessary to understand the accretion physics around these BHCs. We make a detailed study of the evolution of spectral properties of newly discovered Galactic transient BHC MAXI J1659-152 during its very first (2010) outburst after its discovery on 2010 Sept. 25 by MAXI/GSC using Chakrabarti-Titarchuk two-component advective flow (TCAF) model as an additive table model in XSPEC. Accretion flow parameters (Keplerian disk and sub-Keplerian halo rates, shock location and shock strength) are extracted from our spectral fits with TCAF. We studied the variation of these fitted parameters during the entire outburst as it passed through three spectral classes: hard, hard-intermediate, and soft-intermediate. More interestingly, no soft state is observed, which may be due to the lack of matter from thermally cooler Keplerian disk component. So in that context, we can call this outburst as a 'failed' outburst. We also predicted mass of the BHC in between 4-8 Solar mass on the basis of keeping TCAF model normalization as constant and fitted $\chi^2_{red}$ variation throughout the outburst. |
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