| Name: | SIKANDAR AKBAR |
| Affiliation: | UNIVERSITY OF KASHMIR |
| Conference ID : | ASI2024_761 |
| Title : | Long term correlation study between X-ray spectral parameters of Mkn 421 using Astrosat data |
| Authors : | Sikandar Akbar Dar, Zahir Shah, Ranjeev Misra , Naseer Iqbal, Javaid tantry |
| Authors Affiliation: | Sikandar Akbar Dar, Naseer Iqbal, Javaid tantry (Department of Physics, University of Kashmir, Srinagar, 190006, India.)
Zahir Shah (Department of Physics, Central University of Kashmir, Ganderbal 191201, India.)
Ranjeev Misra (Inter-University Center for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune, 411007 India.)
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| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | Our study presents a time-resolved X-ray spectral analysis of Mkn 421 using AstroSat observations taken during various epochs between 2016 and 2019. The variability of the source in X-rays was utilised to investigate the evolution of its spectral properties. Each observation period was divided into segments of about 10 ks, and we employed models based on the energy distribution of Synchrotron radiation from particles, including broken-power law, log-parabola, and power-law distributions with maximum electron energy ( ξ max model), to fit each segment. We observed that all of these models accurately depict the spectra. We also investigated the relationship between normalised particle density at an energy less than the break energy and the index before the break. The results revealed an inverse correlation between the index and density with no time delay. The correlations we observed did not align with the expectations of the ξ max model. However, we noted that the model involving energy dependent acceleration time scales predicts the correct observed correlations. Additionally, correlations between spectral parameters were used to determine the pivot energy suggesting that the source's variability is intrinsic in nature.
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