Abstract Details

Name: ANUVAB BANERJEE
Affiliation: SENIOR RESEARCH FELLOW
Conference ID: ASI2020_204
Title : Astrosat-Laxpc Analysis of Theta Class Data of GRS 1915+105
Authors and Co-Authors : Author: Anuvab Banerjee co-authors: Ayan Bhattacharjee, Debjit Chatterjee, Dipak Debnath, Sandip K. Chakrabarti, Tilak Katoch, H. M. Antia
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : GRS 1915+105 is a well known enigmatic microquasar that has shown wide varieties of spectral and timing evolution spanning over different classes. Using Astrosat-Laxpc data, we have ventured to probe into a plausible physical explanation for the evolution of accretion flow in the M-shaped theta class region of its evolution. We have generated dynamic Power Density Spectra (PDS) using 100 Sec time window and shifting the origin of time by 1 Sec in each step. The QPO frequency tends to shift slightly towards the rising portion of the observation, and the Q-factor gradually decreases. Moreover, the nature of evolution of QPO frequency agrees with the photon flux variation. Motivated by this result, we have fitted 4.0-25.0 keV background-subtracted spectra using Two-Component Advective Flow (TCAF)solution, and the flow parameters are consistent with the temporal variation. This further reinforces the importance of the interaction of two kinds of accretion rates in the flow, and the viscosity parameter in the equatorial plane.