Abstract Details
| Name: Dipak Debnath Affiliation: Indian Centre for Space Physics Conference ID: ASI2017_1308 Title : TCAF model in XSPEC : An efficient tool to understand accretion flow properties of black hole binaries Authors and Co-Authors : Dipak Debnath(1), Sandip K Chakrabarti(1,2), Santanu Mondal(1,3), Arghajit Jana(1), Debjit Chatterjee(1), Aslam Ali Molla(1), Shreeram Nagarkoti(1), Ayan Bhattacharjee(2), Anuvab Banerjee(2), Indrani Banerjee(2) 1. Indian Centre for Space Physics, Kolkata, India 2. SN Bose National Centre for Basic Science, Kolkata, India 3. Instituto de Fisica Y Astronomia Facultad de Ciencias, Universidad de Valparaiso, Valparaso, Chile Abstract Type : Oral Abstract Category : Stars,ISM and the Galaxy Abstract : It has been more than two decades of the classic work by Chakrabarti and his collaborators on the two component advective flow (TCAF) model. Recently we are successfully able to include it in HEASARC's spectral analysis software package XSPEC as an additive table model to fit energy spectra from various black hole candidates (BHCs) and obtain physical accretion flow parameters, such as, two component (Keplerian disk and sub-Keplerian halo) accretion rates, shock (location, i.e., the size of the Compton cloud, and the compression ratio) parameters, etc. This has dramatically improved our understanding about the accretion flow dynamics. Evolutions of the spectral and the temporal properties are transparent from the TCAF model fitted/derived physical parameters. Reason of different spectral states and their transitions during an outburst of a transient BHC are also clear. One can also predict frequency of the dominating quasi-periodic oscillation (QPO) from TCAF model fitted shock parameters and even predict most preferable mass range of an unknown BHC from TCAF fits. To our knowledge this gives us the most physical tool to investigate the accretion flow dynamics around black hole candidates. |