Searching for dark matter in the galactic halo using micro lensing technique towards LMC and SMC
Other Title(s)
البحث عن المادة المعتمة في الهالة المجرية باستخدام تقنية التعدس الجذبي المايكروي باتجاه سحابتي ماجلان الكبيرة SMC و الصغيرة LMC
Dissertant
Thesis advisor
University
University of Baghdad
Faculty
College of Science
Department
Astronomy and Space Department
University Country
Iraq
Degree
Master
Degree Date
2010
English Abstract
The microlensing phenomenon is a significant tool in the astronomical studies which is being exploited in a wide range of applications; one of the most important of these applications is the search for dark matter objects in the Galactic halo.
The existence of dark matter in the Galactic halo has been investigated using (11) microlensing events toward Large Magellanic cloud (LMC) and Small Magellanic cloud (SMC) according to the Point Source Point Lens (PSPL) model.
This investigation has been carried out by determining the masses of dark matter objects in order to specify its most probable candidates that are compatible with the results of mass.
The results of this study indicate that the Galactic halo may be dominated by a mixture of different populations of dark matter objects, these objects are too dim; therefore, they cannot be detected by direct observations.
The results of masses reveal that the most plausible candidates of dark matter objects in the Galactic halo are brown dwarfs, red dwarfs, white dwarfs and black holes.
The most preferred candidate is the white dwarfs because the majority of microlensing events show a compatibility with the mass range of white dwarfs (0.3-1.4) M¤.
Furthermore, the presence of neutron stars in the Galactic halo can be ruled out, because there is no event that shows the mass compatibility with the range of mass of neutron stars (1.25-1.44) M¤.
The microlensing parameters are determined and the results are compared with the results of previous works.
The results show a good agreement with the results of MACHO and OGLE teams.
Einstein radius crossing time for all microlensing events is found to be in the range (14.396 – 115.797) days.
This parameter is directly proportional to the mass of the lens.
The calculations and results of this study have been carried out by using (MATLAB 7.6.0 R2008a) software.
Main Subjects
No. of Pages
117
Table of Contents
Table of contents.
Abstract.
Abstract in Arabic.
Chapter One : Introduction.
Chapter Two : Basic theoretical concepts.
Chapter Three : Data handling.
Chapter Four : Calculations and results.
Chapter Five : Discussions, conclusions and future works.
References.
American Psychological Association (APA)
Mahdi, Harith Sad. (2010). Searching for dark matter in the galactic halo using micro lensing technique towards LMC and SMC. (Master's theses Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-603772
Modern Language Association (MLA)
Mahdi, Harith Sad. Searching for dark matter in the galactic halo using micro lensing technique towards LMC and SMC. (Master's theses Theses and Dissertations Master). University of Baghdad. (2010).
https://search.emarefa.net/detail/BIM-603772
American Medical Association (AMA)
Mahdi, Harith Sad. (2010). Searching for dark matter in the galactic halo using micro lensing technique towards LMC and SMC. (Master's theses Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-603772
Language
English
Data Type
Arab Theses
Record ID
BIM-603772
