Timing and Spectral study of Centaurus X-3 as seen by Suzaku

Abstract

We present a detailed timing and spectral analysis of high mass X-ray binary pulsar Centaurus X-3(Cen X-3). The Cen X-3 was observed from December, 08-10, 2008 with the Japanese x-ray satellite Suzaku. We used this data for analysis and obtained pulse period of 4.8s. Using this pulse period, we created pulse profile in soft and hard energy band. In the soft energy range i.e. 10-20 keV and 20-30 keV, the profile is double peaked, broad and almost sinusoidal following pencil beam model for X-ray emission. However, the pulsation was absent above 50 keV. We have resolved three iron k -emission lines at 6.4 keV (Fe I), 6.65 keV (Fe XXV) and 6.9 (Fe XXVI). Absorption like feature is detected at Ecyc ~28 keV. We also report a bump like feature in residual around 10 keV. We have tried to fit a Gaussian line around ~12 keV which improved the reduced chi-square marginally (1.18 for 1210 dof).