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Active galactic nuclei (AGN) emit copiously in the X-ray band. The observed X-ray emission in the radio-quiet category of AGN is believed to be from the corona, a region of hot gas that lies close to the accretion disk. Modelling the observed broadband X-ray emission can give important constraints on the physical nature of the coronal gas. While the temperature of the X-ray corona is known for a few sources, its variation if any is known only for a few. Here, we focussed on the NuSTAR data for a nearby source Mrk 335 having more than two decades of observations from NuSTAR to investigate the variation in the temperature of its corona. From the physical model fits the data, we found the source not to show any changes in its coronal temperature. From timing analysis of the source, using both XMM and NuSTAR observations, we found it to show both flux and spectral variations. We also noticed significant changes in the Fe K alpha line, with its luminosity contribution showing a strong inverse relationship with the source's luminosity. Details of the results will be discussed.
BGS Office