| Name: Sree Bhattacherjee |
| Affiliation: Tezpur University |
| Conference ID: ASI2026_142 |
| Title: Unveiling the spectral evolution of GX 17+2 using observations from AstroSat and NICER |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Sree Bhattacherjee(Tezpur University, Tezpur- 784028, India), Ranjeev Misra(Inter-University Centre for Astronomy and Astrophysics, Pune-411007, India), Biplob Sarkar(Tezpur University, Tezpur- 784028, India), V. Jithesh(Christ University, Bangalore-560029, India), Jayashree Roy(Inter-University Centre for Astronomy and Astrophysics, Pune-411007, India), Yashpal Bhulla(Pacific Academy of Higher Education and Research University, Udaipur-313003, India) |
| Abstract: In this study, we analyze the Z-track neutron star X-ray binary GX 17+2 using the data from the AstroSat and NICER mission. The spectrum spread to a wide range of X-ray energies, allowing for a comprehensive analysis of the source's spectral properties. The X-ray spectra is well defined by multicolor-blackbody component and a thermal Comptonized component. To gain insights into how the spectral parameters, such as inner-disk temperature, mass accretion rate, inner-disk radius, and emission components, change with varying flux intensities, we used a flux-resolved spectroscopy method. This helps in probing the evolution of the source following its characteristic Z-track path. Our study mainly focuses on the spectral variations of the source across different Z- branches. We studied the factors responsible for the formation of the flaring branch, which is obtained to be the mass accretion rate, as it sharply increases from the soft apex to the top of the flaring branch by ~46% and being nearly constant in the normal branch. However, in normal branch the scattering fraction and the inner disk radius are obtained to play an important role in the movement of the source. The study also highlights the importance of the broadband spectral analysis to understand the accretion phenomenon. |
