Specific approach for computing Hubble's constant

Other Title(s)

طريقة نوعية لحساب ثابت هبل

Dissertant

Yunus, Tamarah Muwaffaq

Thesis advisor

Karam, Nihad Ali

Comitee Members

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

University

University of Baghdad

Faculty

College of Science

Department

Astronomy and Space Department

University Country

Iraq

Degree

Master

Degree Date

2005

English Abstract

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 ) .

Main Subjects

Astronomy

No. of Pages

75

Table of Contents

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-603380