Title: Studying the X-ray Reprocessing Region of Centaurus X-3 using nearly fourteen years of MAXI/GSC data

 

Centaurus X-3 is a persistent luminous wind-fed high-mass X-ray binary with the long-term light curve of the source exhibiting intensity variation at a timescale varying from a few orbits to several tens of orbits. The MAXI/GSC instrument, which is an All-Sky Monitor, has been in operation for more than 14 years. Such an instrument is perfect for studying the long-term intensity variation through intensity-resolved and orbital phase resolved spectroscopy, by measuring the X-ray absorption caused by the stellar wind. A spectral model consisting of a partially absorbed power-law continuum with a Gaussian feature is used to measure the variation of photoelectric absorption across the orbit for the orbital phase resolved spectra, which can then be tested against a wind model. Further, an intensity-resolved study of the data by dividing it into three intensity levels and performing a similar analysis can give us insight into the long-term spectral behaviour expected for different intensity levels and how it varies for each level. Such an analysis can help us better understand the local environment of Cen X-3 and its relation with the intensity levels.