4u 0142+61, 1e 2259+586, 1rxs j170849.0_400910 ve 1e 1841_045 anormal x-işini atarcalarinin x-işini zamanlama özellikleri.

In this thesis, the detailed X-ray timing characteristics of four Anomalous X-Ray Pulsars (AXPs); 4U 0142+61, 1E 2259+586, 1RXS J170849.0 -400910, and 1E 1841- 045 are presented for glitch free time intervals using data taken by Rossi X-Ray Timing Explorer (RXTE). The pulse arrival times of these AXPs are evaluated by phase coherent timing method. After the removal of the spin-down trend from pulse arrivals, remaining residuals are used for estimation of their noise strengths. Possible correlation of the noise strength with spin-down rate is investigated for individual sources in di erent time intervals, for AXP class and for whole magnetars. Our initial results indicate that noise strength of these objects are scaling up with their spin down rates for AXPs and magnetarsM.S. - Master of Scienc