MG15 - Talk detail

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It has been more than two decades since Chakrabarti and his collaborators had introduced the two component advective flow (TCAF) model as a global solution to accretion flow processes around black holes. In 2014, we successfully been able to implement this solution into HEASARC's spectral analysis software package XSPEC as an additive table model to fit energy spectra from black hole candidates (BHCs). Now one can directly obtain physical informations about accretion processes 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, mass of the black hole from spectral fits with the TCAF model FITs file. Evolutions of spectral and timing properties during active phases of black hole X-ray binaries are now more transparent from the nature of the variations of the TCAF model fitted/derived physical parameters. The actual cause of different spectral states and their transitions of BHCs (if any) are more clearly understandable. One can also predict frequencies of the dominating type-C quasi-periodic oscillations (QPOs) from TCAF model fitted shock parameters and even estimate most accurate mass of an unknown BHC from TCAF fits. Recently we have introduced a new method based on TCAF model fitted spectral analysis to estimate X-ray flux contributions from jets/outflows (if present). To our knowledge this gives us the most appropriate physical tool to investigate the accretion flow dynamics of BHCs during their active phases.

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