Investigate theories of how galaxies have evolved. Can a galaxy form without a supermassive black hole?

Theories of Galaxy Evolution

Theories of Galaxy Evolution
Assignment 3


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PHYS2086 Astronomy and Black Holes
Word Count: 2103

1 Theories of Galaxy Evolution
Table of Contents
Introduction ................................................................................................................................... 2
Theories and Models ..................................................................................................................... 3
Classical Model.......................................................................................................................... 3
The Hy
id Hierarchical Model .............................................................................................. 4
Evidence ......................................................................................................................................... 7
Dark Matter ............................................................................................................................... 7
Small Blue Galaxies .................................................................................................................. 8
The Role of Black Hole in the Formation of Galaxies…………………………………..…9
Conclusion ................................................................................................................................... 10
References .................................................................................................................................... 11

2 Theories of Galaxy Evolution
Introduction
The galaxies which we notice in our universe cu
ently display an amazing wide range of
qualities, such as morphology, shades, luminosity and characteristics. There galaxies are one
hundred times
ighter than our Milky Way and others that have one thousandth its
luminosity. Some of the galaxies have quite regular forms, and others are amorphous. There
exists galaxies with spheroidal shape which have quite less amount of spinning or rotation,
and their stars tend to have stars with huge ‘thermal motions’ (just like elements of a hot
fluid), and galaxies which appear like spinning disks, where centrifugal and selfgravity force
alance each other (Houjun, M & White, S, 2010). There also exist galaxies having great
volumes of gas (mostly helium and hydrogen) and dirt, and a strenuous action of STAR
FORMATION. Other galaxies comprise mostly of old, progressed stars, showing that the
action of star formation in such systems led to a distant past (Gi
ons, W, 1990).
Galaxy development and progress mainly requires the actual procedures that lead to
the establishment of a non-uniform universe from a homogeneous start. The way in which the
first universe were established and the way that they have progressed eventually and the
actual procedures that have led to different components in the nea
y universe form the basis
of the concepts that make an effort to describe how the universe were established and their
following progress (Djorgovski, S, 2001). Framework development concepts make an effort
to
ing forth the way in which the galaxies were established, with galaxy development being
linked to numerous huge variations after the start of the Big Bang. The connotation of this
model of galaxy development is that clustering and consolidating describes how the various
galaxies increase their mass, and also performs a considerable role in identifying the shape
and the dwelling of the galaxy (Djorgovski, S, 2001).

3 Theories of Galaxy Evolution
From the beginning studies regarding galaxy, astronomers have attempt to develop
different designs to be able describe the development and progress of the universe. The
technical progression has triggered the process of further analysis to be able to have an
understanding of the universe during their beginning developing stages and their following
progress (Gi
ons, W, 1990). In the last 10 years, the implementation of technical equipment
like the Hu
le Space Telescope has allowed the analysis of universe that were existing
during enough time when the entire universe was approximately 10 % of its existing age.
This analysis has led to some proof that can be applied in the pursuit for pursuit for
describing the galaxy development and progress (Djorgovski, S, 2001). The two major
concepts with regards to galaxy development and progress were recommended during the
Sixties (Houjun, M & White, S, 2010). Over time, observational proof lead to significant
estrictions of the recommended designs for describing the development and following
progress of universe (Djorgovski, S, 2001). The considerable challenge is that the concepts
are not in concu
ence with the gathered proof from the universe. This paper examines the
competitive concepts of how the universe progressed and whether universe can be established
with super-massive black opening (Dressler, A, 1996).
THEORIES & MODELS
Classical Model
Going by classical model, as portrayed in...