Pulse phase resolved x-ray spectroscopy of four accretion powered millisecond pulsars

Download

index.pdf

Date

2014

Author

Çolak, Sıdıka Merve

Metadata

Show full item record

Item Usage Stats

221
views

119
downloads

In this thesis, pulse phase resolved X-ray spectroscopy of four accretion powered millisecond pulsars which are IGR J00291+5934 , IGR J17498-2921 , XTE J0929-314 and XTE J1807-294 will be presented. Phase dependent changes during their outbursts will be checked for possible correlations of spectral parameters such as photon index and blackbody temperature with rotation phase using archive of Rossi X-ray Timing Explorer (RXTE) observations. In the analysis of IGR J17498-2921 in 2011 outburst , positive correlation is found between photon index and flux. In the analysis of XTE J0929-314 in 2002 outburst, negative correlation is found between photon index and blackbody temperature. In the analysis of XTE J1807-294 in 2003 outburst, about 150 days RXTE observation data is divided into 7 states, which consist of 3 flare and 4 non-flare states. In the first flare state analysis, negative correlation is found between blackbody temperature and photon index. In the second flare state analysis, positive correlation is found between blackbody temperature and photon index. In the second non-flare state analysis, positive correlation is found between flux and photon index. In the fourth non-flare state analysis, positive correlation is found between flux and photon index. On the other hand, correlation between blackbody temperature, photon index and flux is not found in the analysis of third flare state, first non flare state and third non-flare state analysis of XTE J1807-294 and in the analysis of IGR J00291+5934 in September 2008 outburst.

Subject Keywords

Pulsars., X-ray spectroscopy.

URI

http://etd.lib.metu.edu.tr/upload/12617823/index.pdf
https://hdl.handle.net/11511/23857

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

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 ...
Frequency-resolved spectroscopy of XB1323-619 using XMM-Newton data: detection of a reflection region in the disc Balman, Şölen (Oxford University Press (OUP), 2010-09-21) We present the frequency-resolved energy spectra (FRS) of the low-mass X-ray binary dipper XB1323-619 during persistent emission in four different frequency bands using an archival XMM-Newton observation. FRS method helps to probe the inner zones of an accretion disc. XB1323-619 is an Atoll source and a type-I burster. We find that the FRS is well described by a single blackbody component with kT in a range 1.0-1.4 keV responsible for the source variability in the frequency ranges of 0.002-0.04 and 0.07-0.3...
Frequency response function measurement and parametric SISO system modelling of a gyro-stabilized infrared electro optic gimbal system Ozdogan, Gokhan; Leblebicioğlu, Mehmet Kemal (2016-05-01) In this research study, a single axis (inner azimuth gimbal) of a four-axis gyro-stabilized electro optic gimbal system is modelled through experimental investigation in the frequency domain, and the results of this investigation are presented. The dynamic behaviour of the mechanical system is obtained from input and output signals, strictly speaking, nonparametric measurements. Detecting and measuring the nonlinear distortions allows a better understanding and gives an intuitive insight into the error sour...
Applications in broadband THz spectroscopy towards material studies Türkşen, Zeynep; Altan, Hakan; Department of Physics (2011) The purpose of this work was to construct and analyze a THz time domain spectroscopy (THz-TDS) system by using a nanojoule energy per pulse ultrafast laser (non-amplified ultrafast laser or oscillator) source and a non-linear optical generation method for THz generation. First a THz-TDS system, which uses photoconductive antenna (PCA) method for THz generation, was built to understand the working principles of these types of systems. This THz-TDS system which used PCA for generation and a 2mm thick <110> Zn...
Steady-state bipartite entanglement supported by a squeezed environment Can, MA; Akir, O; Gunhan, AC; Klyachko, AA; Pak, Namık Kemal; Shumovsky, AS (2005-05-01) We examine the entanglement of two atoms induced by an external quantum system. Both two-level atoms are coupled to a third two-level system by dipole interaction, and the third system is under the influence of a certain environment. We examine different types of environments and show that the steady-state bipartite entanglement can be achieved. We show that a strongly fluctuating environment is more preferable because the transmission of quantum fluctuations to the atomic system creates and supports steady...

Citation Formats

S. M. Çolak, “Pulse phase resolved x-ray spectroscopy of four accretion powered millisecond pulsars,” M.S. - Master of Science, Middle East Technical University, 2014.