| Name: | Susmita Das |
| Affiliation: | Presidency University |
| Conference ID : | ASI2022_125 |
| Title : | Relation between Hard and Soft X-ray Emission in Two TeV Blazars using Astrosat |
| Authors : | Susmita Das, Ritaban Chatterjee |
| Abstract Type: | Poster |
| Abstract Category : | Extragalactic Astronomy |
| Abstract : | We study several simultaneous hard (3-80 keV) and soft (0.3-8 keV) X-ray light curves of the TeV blazars Mrk 421 and 1ES 1959+650 observed by the SXT and LAXPC instruments onboard AstroSat. The light curves are 45-450 ks long with time bins as short as 250 s and are from multiple epochs during 2016-2019. We calculate the discrete cross-correlation function along with its uncertainty using a model-independent method to probe the inter-band relation. We find that the hard and soft X-ray variability are very well correlated. The time lag is consistent with zero in most pairs of light curves and indicates hard or soft lag in the rest. We comment on possible physical scenarios that may generate the observed time lag and its variation from one epoch to another. |