| Name: | H Lalthantluanga |
| Affiliation: | Mizoram University |
| Conference ID : | ASI2024_538 |
| Title : | Long-term study of broadband variability in Cygnus X-1 using AstroSat |
| Authors : | Author
H Lalthantluanga
Co-Authors
Akash Garg, Ranjeev Misra, Vanzarmawii Chhangte, Lalthakimi Zadeng
|
| Authors Affiliation: | Author - Mizoram University
Co-Author - Inter-University Centre for Astronomy and Astrophysics (IUCAA)
Co-Author - Inter-University Centre for Astronomy and Astrophysics (IUCAA)
Co-Author - Mizoram University
Co-Author - Mizoram University
|
| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | Rapid variability in the X-ray emission is a fascinating phenomenon observed in the black hole X-ray binaries (BHBs). The power density spectrum (PDS) of such a variability shows distinct peaks at specific frequencies, known as Quasi-periodic oscillations (QPO) and broadband features, signifying a periodic variations in the X-ray flux. In this work, we have taken the long-term AstroSat observations of a black hole system Cygnus X-1 and found the presence of broadband features in the PDS. We modeled the joint LAXPC and SXT spectrum for each observation with thermally Comptonized and multi-black body components. We then utilize the spectral parameters to model the energy-dependent behavior (fractional root mean square and time-lag variation) of the observed broadband variability to identify the radiative components responsible for producing the variability. We found a general trend in all observations that the variation in inner disk temperature, coronal heating rate, and fractional scattering with time delays between them is able to describe the fractional RMS and time-lag spectra. We discuss the implications of the results. |
