Specific approach for computing Hubble's constant

العناوين الأخرى

طريقة نوعية لحساب ثابت هبل

مقدم أطروحة جامعية

Yunus, Tamarah Muwaffaq

مشرف أطروحة جامعية

Karam, Nihad Ali

أعضاء اللجنة

Karim, L. M.
Salih, S. A.
al-Rikabi, Ali Talib Muhammad Hasan

الجامعة

جامعة بغداد

الكلية

كلية العلوم

القسم الأكاديمي

قسم الفلك و الفضاء

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2005

الملخص الإنجليزي

Gravitational lensing is the phenomena of light deflection by massive bodies .

In this work the gravitational lensing phenomena has been employed to study the cosmological application and calculate Hubble constant Ho which gives an idea about the age of the universe . There is no general mathematical model applicable for various lensing systems since there are many physical variables included and there is correlation complicity . From here the idea of the study comes to find a suitable procedure to exploit the data in calculating time delay (Δt) then determine Hubble constant Ho . This study includes processing the intensity data of images A & B of quasar microlensing for two lensing systems Q0957+561 and Q2237+0305 by using MATLAB software to find (Δt) , two techniques were applied :- 1- Discrete Fourier Transform . 2- Cross-Correlation Function . Results have been obtained for Hubble constant Ho after a suitable model was adopted for quasars Q0957+561 and Q2237+0305 and the value of Δt used to obtain Ho , from the value of (Δt) of quasar Q0957+561 (Ho ≈ 66.29 km.sec-1.Mpc-1) have been found and from (Δt) of Q2237+0305 ( Ho ≈ 77 km.sec-1.Mpc-1 ) .

Then the applications of strong lensing which include the diameter of lens ( galaxy ) , the distances of the systems have been studied for seven lensing systems in Friedman models (open case , closed case , Euclidean case ) .

التخصصات الرئيسية

الفلك و علومه

عدد الصفحات

75

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-603380