Galaksideki pulsarlar ve yıldız oluşum bölgelerinin (Sfr) dağılımını güncelleyerek Sfr'lerin galaksi düzlemine göre asimetrisinin ilk kez belirlenmesi

Yeşilyaprak, Cahit
Yerli, Sinan Kaan
Ankay, Aşkın
In this project, we have tried to find calibrators (radio pulsar with ages less than 106 years, some specific SNR’s and massive X-ray binary sources) that will be used through out the Galaxy. In addition to calibrator properties, with the help of these sources, by studying distribution of SFRs we have tried to define the asymmetry of the Galaxy. For those pulsars that we have used, we defined our own criteria (especially pulsar distance and luminosity). To achieve this, the most important parameter of the Galaxy, distribution of electron density, had to be redefined. Therefore, by constructing a bigger picture of the Galaxy, distribution of the SFRs and asymmetry of the distribution could be reached.


A Multiwave length investigation of Be/X-ray binaries in the galaxy
Özbey Arabacı, Mehtap; Kızıloğlu, Ümit; Ertan, Ünal; Department of Physics (2014)
As displaying different transient optical and X-ray behaviors both among themselves and individually, Be/X-ray binaries (BeXRBs) have been one of the most interesting populations of High Mass X-ray Binaries (HMXBs) since their discovery. Although their standard observational properties can be put together in distinct classes, there still have been several Be/X-ray systems showing unique features beyond these classifications. In this thesis, we first present a new and comprehensive catalog of Be/X-ray binari...
The broad-band noise characteristics of selected cataclysmic variables (CVS), anomalous x-ray pulsars (AXPS) and soft gamma repeaters (SGRS)
Külebi, Baybars; Balman, Şölen; Department of Physics (2006)
In this work present the broad-band noise structure in the 2-60 keV data of Cataclysmic Variables (CVs) with Anomalous X-Ray Pulsars (AXPs) and Soft Gamma Repeaters (SGRs). We analyzed Rossi X-ray Timing Explorer (RXTE) PCA data and derived time series from 27 CVs, 4 AXPs and 1 SGR using the RXTE archive. In general, CVs of different types all show broad band noise which can be fitted with power laws, using exponentional cut-offs, and Lorentzians in a similar way to power spectral (noise) characteristics of...
Pulse phase resolved x-ray spectroscopy of four accretion powered millisecond pulsars
Çolak, Sıdıka Merve; Baykal, Altan; Department of Physics (2014)
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 corre...
Investigation on the incorporation of quantum dot thin film layers in the organic and inorganic solar cell structures
Candan, İdris; Erçelebi, Ayşe Çiğdem; Parlak, Mehmet; Department of Physics (2016)
Thin films based photovoltaic solar cell technologies have the Shockley-Queisser limit for maximum efficiencies and these cells can only collect photon in the specific energy range due to their band gap. New approaches are needed to improve the power conversion efficiency (PCE) of photovoltaic devices. Quantum dots (QDs) thin film layer inside any device structure is particularly attractive candidates to increase the PCE of solar cells due to their size adjustable band gap values, multiple exciton generatio...
X-ray analysis of high mass x-ray binary pulsars
Şahiner, Şeyda; Baykal, Altan; İnam, Sıtkı Çağdaş; Department of Physics (2015)
In this thesis, X-ray properties of three high mass X-ray binary (HMXB) pulsars are analysed, using the data of X-ray satellites such as RXTE, INTEGRAL and Swift. Selected sources belong to different subgroups of the HMXB family. The first system, 4U 1907+09 is a classical wind-fed supergiant system with persistent X-ray emission; although it shows irregular flares and dips. SWIFT J1729.9-3437 and SWIFT J0513.4-6547 are newly discovered transient systems. Although the counterpart of SWIFT J1729.9-3437 could...
Citation Formats
C. Yeşilyaprak, S. K. Yerli, and A. Ankay, “Galaksideki pulsarlar ve yıldız oluşum bölgelerinin (Sfr) dağılımını güncelleyerek Sfr’lerin galaksi düzlemine göre asimetrisinin ilk kez belirlenmesi,” 2013. Accessed: 00, 2020. [Online]. Available: