| Name: | Susmita Das |
| Affiliation: | Presidency University, Kolkata |
| Conference ID : | ASI2023_17 |
| Title : | X-ray Spectral Variability Studies of High Synchrotron Peaked Blazars using AstroSat |
| Authors : | Susmita Das and Ritaban Chatterjee |
| Mode of Presentation: | Poster |
| Abstract Category : | Extragalactic Astronomy |
| Abstract : | We present the observations of two bright TeV blazars Mrk 421 and 1ES 1959+650 at X-ray energies using the SXT (0.3-8 keV) and LAXPC (3-80 keV) instruments onboard AstroSat simultaneously during multiple epochs in 2016-19. The energy light curves show intra-day variability and change in flux states from epoch to epoch. The hardness ratio varies with time and it follows a "harder when brighter" trend. We carry out time-resolved X-ray spectroscopy for all observations and fit the combined SXT-LAXPC spectrum with log-parabola and broken-power law models. We search for correlations between the best-fit spectral parameters. On the basis of the results obtained we discuss possible emission mechanisms and constraints on the physical parameters of the jets of blazar.
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