High-energy emission and temporal properties of magnetars
Şaşmaz Muş, Sinem (2014) High-energy emission and temporal properties of magnetars. [Thesis]
Magnetars have been intriguing sources since their discovery, as they opened new avenues on the formation, evolution and emission mechanisms of the neutron stars. Thanks to the long-term observations of these sources, we are able to investigate many aspects of them. In this thesis, we investigate the high-energy gamma-ray emission properties of one of the brightest magnetars in X-ray band, 4U 0142+61. We searched for persistent and pulsed gamma-ray emission using the data obtained with Fermi/LAT. We did not detect significant high-energy gamma-ray emission from this source. Nevertheless, we could place upper limits to the gamma-ray flux and spectral break energy of the source. Together with the earlier works on soft and hard X-ray emission of 4U 0142+61, these upper limits provide a hint on the spectral shape of the source in a wide energy band. Next, we studied the long-term timing and X-ray properties of two frequently glitching magnetars, 1RXS J170849.0- 400910 and 1E 1841-045, with RXTE/PCA. In the analysis of 1RXS J170849.0- 400910 we identified two significant glitch candidates in two data gaps. The source was radiatively stable during the RXTE observations. In the analysis of 1E 1841- 045, we identified a glitch and an anti-glitch ∼1 yr apart from each other. We found no evidence of radiative variability during both the glitch and anti-glitch events. Finally, we discuss our results in the context of glitch models.
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