Why do galaxy clusters form sheets?

In summary, the conversation discusses the existence of galactic cluster sheets and the possible reasons for their formation. The participants suggest different theories such as collisions between galaxies, preferred spin of clouds, and chaotic behavior. They also mention the lack of mathematical models to fully explain this phenomenon.
  • #1
drag
Science Advisor
1,105
1
Greetings !

I just read Saint's post in the "moving galaxy"
thread and though I knew the answer to that, I do
not believe I have so far read somewhere an
explanation for the existence of the galactic
cluster sheets.

So, is there a known and recognized reason ?
(My guesses :
1. The same reason that star-systems and galaxies are
mostly two-dimensional - a simple kinematic
solution for a system of bodies enitially spread
around mostly at rest and mutually affected by
gravitational forces.
2. Some form of quantization during the BB ? )

Thanks.

"I sometimes ask myself how it came about that
I was the one to develop the theory of relativity.
The reason, I think, is that a normal adult
never stops to think about problems of space and time.
These are things which he has thought about as a child.
But my intellectual development was retarded, as a
result of which I began to wonder about space and time
only when I had already grown up."
Albert Einstein

Live long and prosper.
 
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  • #2
drag-

How about early galactic collisions and their spatial redistribution of angular momentum?

Also, sheet clusters may have evolved from clouds of preferred spin.

Your guesses are good ones, too!
 
  • #3
Greetings Loren !
Originally posted by Loren Booda
How about early galactic collisions and their
spatial redistribution of angular momentum?
You mean - shockwaves ?
Wouldn't expansion prevent that ?
Originally posted by Loren Booda
Also, sheet clusters may have evolved
from clouds of preferred spin.
What do you mean (matter & anti-matter)?
Originally posted by Loren Booda
Your guesses are good ones, too!
Thanks, but my first one does not explain why
the sheets are mostly parallel at all.
And my second is far from anything I could provide
an educated opinion about - just a wild thought.

Live long and prosper.
 
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  • #4
drag-

Collisions between galaxies of various orientations in the early universe may have enabled parallel distribution. Preferring low angular velocity, the developing galaxies expanded in one plane while conserving angular momentum and increasing entropy.

Before galaxies there were stars, and before them, hydrogen molecules. In a given primordial region much larger than a galaxy but much smaller than the universe there would have been probably an overall angular momentum which condensed eventually into local galactic sheets.
 
  • #5
Greetings !

Intresting.
Is this some type of Chaotic behaviour (there are
huge amounts of stars and matter in every "sheet") ?
Are there some mathematical models that adress
such a solution ? What's the difference if we
consider every star to be a galaxy and then
use the same model ? Do the "sheets" have angular
momentum (which could "help" such a model) ?

(Links would also be appreciated people, I'm going
to look for some myself too.)

Thanks !

Live long and prosper.
 
Last edited:
  • #6
Last edited by a moderator:

FAQ: Why do galaxy clusters form sheets?

1. What are sheets of galaxy clusters?

Sheets of galaxy clusters are large, thin structures in the universe that are made up of multiple clusters of galaxies. They are one of the largest known structures in the universe, with some spanning over billions of light years.

2. How are sheets of galaxy clusters formed?

Scientists believe that sheets of galaxy clusters are formed through the process of cosmic web formation, where gravity pulls matter together to form large structures. As matter continues to collapse and cluster together, sheets of galaxy clusters are created.

3. How do scientists study sheets of galaxy clusters?

Scientists use a variety of tools and techniques to study sheets of galaxy clusters, including telescopes, computer simulations, and data analysis. They also study the distribution of galaxies and dark matter within the sheet to better understand its structure and formation.

4. What is the significance of studying sheets of galaxy clusters?

Studying sheets of galaxy clusters can provide valuable insights into the large-scale structure of the universe and the processes that govern its formation. It can also help us understand the distribution of dark matter and the evolution of galaxies within these structures.

5. Are there any real-world applications for studying sheets of galaxy clusters?

While the study of sheets of galaxy clusters is primarily focused on gaining a better understanding of the universe, it can also have practical applications. For example, understanding the distribution of dark matter within these structures can help us map out the invisible mass in the universe, which is crucial for understanding the dynamics of the cosmos.

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