The Spectral and temporal properties of MAXI J1409-619

Dönmez, Çağatay Kerem
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 findings. At the peak outburst, the spectra are modeled with a power law with a high energy cutoff, plus a Gaussian Fe line fixed at 6.4 keV. On the other hand, a simple power law model is used in observations with unsufficiently low count rates. Absorption-corrected peak flux on MJD 55534 is calculated to be 1.96*10^-9 erg s^-1 cm^-2 in 3-25 keV range. Assuming a distance of ~14.5 kpc, corresponding peak luminosity is L_(3-25 keV) ~ 4.9*10^37 erg s^-1. Furthermore, evolution of spectral parameters of the source and the correlations between these parameters are studied. Throughout the outburst stage, periodic variability in the light curves becomes evident. P_(spin) ~ 503 s is found at the outburst onset. Using phase-resolved spectroscopy, a double-peaked pulse profile is verified, and spectral parameters with changing phases are investigated. Lastly, power spectral analysis confirms the existence of quasi-periodic oscillations (QPO) and their harmonics in MAXI J1409-619. As the outburst progresses, centroid frequency of the QPOs shifts from ~0.2 Hz to ~0.1 Hz, implying the QPO features are linked with flux and mass transfer rates. Two observations on MJD 55541 with 19 ks exposure reveals a QPO at 0.190 Hz with two harmonics, implying a magnetic field of ~1*10^13 G.


Investigation of quasi-periodic noise features in x-persei
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 spectrum and dips of RE 0751+14: A joint evaluation of ROSAT and ASCA archival data
Kiziloglu, U; Baykal, Altan; Alev, M; Gogus, E (1998-01-01)
Using archival ASCA and ROSAT observations of RE 0751+14, X-ray energy spectra, pulse profiles and the results of pulse timing analysis are presented. The energy spectra are well-fitted by a blackbody model at low energy and a Raymond-Smith model at high energy, together with a partial covering absorber. A fluorescence emission line at 6.4 keV with an equivalent width similar to 220 eV was resolved for the first time.
Recent Spin Rate Measurements of 4U 1907+09
Sahiner, S.; İNAM, SITKI ÇAĞDAŞ; Baykal, Altan (2010-08-06)
In this study, X-ray spectral and pulse timing analysis of the high mass X-ray binary (HMXB) pulsar 4U 1907+09, based on the observations with RXTE are presented. Spin rate measurements indicate a new spin-down episode with a rate close to the previous steady spin-down rate. Orbital phase resolved spectroscopy reveals that the Hydrogen column density varies through the orbit reaching to its maximum value just after periastron. A slight spectral softening with increasing luminosity is aslo observed.
The X-ray spectral evolution of classical Nova V1974 Cygni 1992: A reanalysis of the ROSAT data
Balman, Şölen; Krautter, J; Ogelman, H (IOP Publishing, 1998-05-20)
We present a spectral analysis of the archival X-ray data of classical Nova V1974 Cygni 1992 (Nova Cygni 1992) obtained by the ROSAT Position Sensitive Proportional Counter (PSPC). The X-ray spectrum is fitted with a two-component model. The first component is a white dwarf atmosphere emission model developed for the remnants of classical novae near the Eddington luminosity. The model is used to fit the soft X-ray data in the similar to 0.1-1.0 keV range, where the bulk of emission is below 0.7 keV. The sec...
Pulse timing studies of X-ray binaries: GX1+4,SWIFT J0513.4-6547, X Persei and SXP 1062
Serim, Muhammed Miraç; Baykal, Altan; İnam, Sıtkı Çağdaş; Department of Physics (2019)
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, w...
Citation Formats
Ç. K. Dönmez, “The Spectral and temporal properties of MAXI J1409-619,” M.S. - Master of Science, Middle East Technical University, 2019.