Dynamic analysis and CCD imaging of spiral galaxies
Other Title(s)
التحليل الديناميكي للمجرات الحلزونية CCD المأخوذة بالكاميرة
Dissertant
Thesis advisor
al-Birmmani, Muhammad Jafar
Ali, Salih Mahdi
Comitee Members
Salih, Salah A.
Lifta, Salih J.
Abbud, Kamal Muhammad
Ahmad, Muhammad S.
al-Haddad, Rad Muhammad Salih
University
University of Baghdad
Faculty
College of Science
Department
Department of Physics
University Country
Iraq
Degree
Ph.D.
Degree Date
2011
English Abstract
The rotation dynamics of spiral galaxy is modeled using two kinds of mass distributions.
One with constant density, and other with radial distributions.
These two distributions were applied for two types of galaxy.
The first is spherical and the second is oblate ellipsoids.
The gravitational field outside a spherical shell is acting as if the mass of the shell were concentrated at its center.
Since the mass outside the radius ?? does not have any gravitational effect and the rotational velocity ?? is independent of ??, one must have ??(??) ∝ ??.
This conclusion does not agreed with the visible mass distributions of galaxies, which instead show a mass density that drops exponentially as a function of the radius.
At the same time the calculated velocity distribution inside the galaxy is similar to that obtained from astronomical observations.
To investigate the density wave theory of spiral galaxies, we studied the behavior of surface mass distribution (??), Radial velocity (??) and tangential velocity (??) numerically by using Lax method to give results that matches the real astronomical observations.
We have carried out real observation of spiral galaxies NGC 4448 and NGC 3359 using the 1.88 m optical telescope of Kottamia Astronomical Observatory, KAO, Egypt.
From the observations, the surface brightness profiles, Ellipticity profiles, position angle profiles and color indices profiles are described and studied.
The eastern part of the galaxy NGC 4448 is brighter than the western part.
This is attributed to the magnitude difference between the two.
The difference is about (0.94 mag/arcsec2) this may indicate that there are young stars in the brighter part of the galaxy
Main Subjects
Topics
No. of Pages
125
Table of Contents
Table of contents.
Abstract.
Abstract in Arabic.
Chapter One : General introduction.
Chapter Two : Dynamics of spiral galaxies.
Chapter Three : Galaxy dynamics modeling.
Chapter Four : Observations and CCD photometry.
Chapter Five : Conclusion and future work.
References.
American Psychological Association (APA)
Ali, Sinan Hasan. (2011). Dynamic analysis and CCD imaging of spiral galaxies. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-608286
Modern Language Association (MLA)
Ali, Sinan Hasan. Dynamic analysis and CCD imaging of spiral galaxies. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad. (2011).
https://search.emarefa.net/detail/BIM-608286
American Medical Association (AMA)
Ali, Sinan Hasan. (2011). Dynamic analysis and CCD imaging of spiral galaxies. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-608286
Language
English
Data Type
Arab Theses
Record ID
BIM-608286