Pulse timing studies of X-ray binaries: GX1+4,SWIFT J0513.4-6547, X Persei and SXP 1062

Serim, Muhammed Miraç
This thesis focuses on X-ray timing properties of four different X-ray binary systems, based on archival data of the X-ray missions RXTE, Swift, XMM-Newton, Chandra and Integral. One of the selected sources is a LMXB system GX 1+4 while remaining sources are BeXB systems: SWIFT J0513.4-6547, X Persei and SXP 1062. For GX 1+4, the timing analysis of RXTE-PCA observations between 2001 March 3 and 2003 January 31 are presented. The timing solutions of two different time intervals are constructed. Futhermore, within the CGRO-BATSE data between 1991 and 1999, an episodic mode-switching of correlation between X-ray flux and frequency derivative is observed. For SWIFT J0513.4-6547, the data of 2009 outburst and the re-brightening in 2014 are investigated with exquisite details. When the source is quiescent between 2009 and 2014, average spin-down rate of the source is measured to be ∼ 1.52 × 10−12 Hz/s indicating a surface dipole magnetic field of ∼ 1.5 × 1013 G. X Persei is examined using RXTE and Integral observations between 1998 and 2010. For X Persei, the result on the dependence of frequency derivative on X-ray flux hints that wind accretion is also possible. From the noise spectrum, a red noise component with an index of ∼ −1 is observed with an excessive noise component dominating the disc accretion flow on long time-scales. In the case of SXP 1062, the pulsar’s rotation is observed to slow down with a steady rate −4.29(7) × 10−14 Hz/s from which the magnetic field is inferred to be ∼ 1.5 × 1014 G. Furthermore, precise pulse timing study of the object reveals a glitch event with an amplitude of ∆ν = 1.28(5) × 10−6 Hz which is an extraordinary event for an accreting pulsar. Although the glitch events are conventionally observed in isolated pulsars, the discovery of a glitch in SXP 1062 ensures that glitch events are also possible for accreting pulsars.


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Acuner, Zeynep; Baykal, Altan; Department of Physics (2014)
In this thesis, timing and spectral properties of the Be type X-ray binary XPersei based on Rossi X-Ray Timing Explorer (RXTE) have been presented. Results of the power spectral analysis of RTXE data show QPO features detected between ⇠ 0.1-0.4 Hz which are reported for the first time. Another significant property of X-Per’s power spectra is the time dependent excess that can be observed between 0.01-0.08 Hz throughout the observations. These power excesses are interpreted as an inherent feature of source’s...
The Spectral and temporal properties of MAXI J1409-619
Dönmez, Çağatay Kerem; Baykal, Altan; Department of Physics (2019)
In this thesis, spectral and timing analysis of the transient high-mass X-ray binary (HMXB) pulsar MAXI J1409-619 are presented. MAXI J1409-619 was discovered in October 2010, and went into an outburst in early December 2010 until February 2011. Observations of Swift and RXTE throughout this period are used in the thesis. The analysis results are in line with the assertion that MAXI J1409-619 is an accretion-powered pulsar. Time-resolved energy spectra of RXTE and Swift data confirm the previously reported ...
Pulse frequency changes of 1E 2259+586 and the binary interpretation
Baykal, Altan (1996-03-20)
Pulse frequencies from the archival ROSAT observations of 1E 2259+586 are presented. A short-term spin-up episode superposed on the secular spin-down trend is observed. Combining the previously published pulse frequencies, we estimate the variance of the angular velocity over a 15 yr span of observations. The level of fluctuations in angular velocity is similar to that of established accreting binary neutron stars. These results favor accretion by a neutron star from a very low mass companion as the source ...
Timing studies of X Persei and the discovery of its transient quasi-periodic oscillation feature
Acuner, Z.; İNAM, SITKI ÇAĞDAŞ; Sahiner, S.; Serim, Muhammed Miraç; Baykal, Altan; Swank, J. (2014-10-11)
We present a timing analysis of X Persei (X Per) using observations made between 1998 and 2010 with the Proportional Counter Array (PCA) onboard the Rossi X-ray Timing Explorer (RXTE) and with the INTEGRAL Soft Gamma-Ray Imager (ISGRI). All pulse arrival times obtained from the RXTE-PCA observations are phase-connected and a timing solution is obtained using these arrival times. We update the long-term pulse frequency history of the source by measuring its pulse frequencies using RXTE-PCA and ISGRI data. Fr...
Frequency Resolved Spectroscopy of XB 1323-619 and EXO 0748-676
Balman, Şölen (2009-09-11)
We present the frequency resolved energy spectra (FRS) of the low-mass X-ray binary dipper XB 1323-619 and EXO 0748-676 using archival XMM-Newton observations. The FRS of XB 1323-619 is well described by a single blackbody component with kT in a range 1.2-1.6 keV. We attribute this to an existing boundary layer, the likely source of the soft emission, supported by radiation pressure. We detect a different form of FRS for the frequency ranges 0.9-6 Hz and 8-30 Hz which is modeled best with a power law and a ...
Citation Formats
M. M. Serim, “Pulse timing studies of X-ray binaries: GX1+4,SWIFT J0513.4-6547, X Persei and SXP 1062,” Ph.D. - Doctoral Program, Middle East Technical University, 2019.