# I Action Dynamics of the Local Supercluster

1. Dec 9, 2017

### |Glitch|

The interactive model can be found at: Action Dynamics of the Local Supercluster Interactive Model

Source:
Action Dynamics of the Local Supercluster - The Astrophysical Journal, Volume 850, Number 2, December 2017 (free preprint)

2. Dec 9, 2017

### Arman777

Its very interesting..I am not sure but are all of the galaxies approaching to clusters for example to the Virgo ?
I search something and find this

"What I think is the most amazing fact about the supercluster, is that in 100 billion years from now, the gravitational attraction between galaxies and clusters will have pulled it all into a single, enormous, writhing mass of stars. At this time, other superclusters will also be converging together, separated by billions of light years due to the expansion of the Universe. However, something interesting that you may be familiar with is that astronomers have actually noticed an unusual movement of galaxy clusters within the supercluster. Many are moving in the direction of the Norma Cluster, but it is very difficult to see why because of the large amount of material in the Milky Way’s plane. For now this has been dubbed the ‘Great Attractor’ due to its unexplained tug. It may, in fact, be related to dark flow: a mysterious force tugging on galaxy clusters from beyond the scope of the observable universe."
(https://www.quora.com/What-is-a-virgo-supercluster)

So my question makes sense or in general it makes sense and its amazing. Can we see Norma cluster in this interactive model, or its affects?

3. Dec 9, 2017

4. Dec 9, 2017

### Arman777

The idea is really interesting. But I didnt quite get it. Isn't it normal that galaxies move towards clusters ? Galaxies can have peculiar velocities and can be attracted to clusters due to gravity.

In description of dark flow it says ""non random" ? peculiar velocity is a random motion yes but its caused by gravity right so what is this extra motion ?

or am I missing something ?

5. Dec 9, 2017

### phinds

You have the first part right. "Dark Flow" is a supposed anomaly in that it has a preferred direction. Did you not read the Wikipedia article?

6. Dec 9, 2017

### Arman777

Oh wait I see now,
$v_r=H_0d+v_{pec}$ and in here
$v_{pec}$ has some non random component but $v_{pec}$ is actually random motion, so this is a anomaly

7. Dec 9, 2017

### |Glitch|

According to their paper, the model does include the affects of the "Great Attractor."

8. Dec 9, 2017

### Arman777

Thats nice..Its hard to see in the model I guess..I wish they could give it a color.