The discussion revolves around the interactive visualization of gravitationally induced trajectories of galaxies within the Local Supercluster, utilizing a Numerical Action Method model. Participants explore the dynamics of galaxy movements towards clusters, particularly the Virgo Cluster, and the implications of phenomena such as "dark flow" and the "Great Attractor." The scope includes theoretical and conceptual aspects of astrophysics and cosmology.
Participants generally express interest in the topics discussed, but there is no consensus on the implications of "dark flow" or the nature of galaxy movements towards clusters. Multiple competing views remain regarding the interpretation of gravitational dynamics and the effects of the "Great Attractor."
Participants reference various theories and observations, but there are limitations in understanding the complexities of gravitational interactions and the implications of peculiar velocities. The discussion reflects ongoing uncertainties in astrophysical models.
Interactive visualization of the fully nonlinear gravitationally induced trajectories of a nearly complete set of galaxies, groups, and clusters in the Local Supercluster constructed in a Numerical Action Method (NAM) model constrained by data from the CosmicFlows survey and various distance indicators. The Virgo, Fornax, Antlia and Virgo W clusters are represented by large spheres colored red, khaki, black, and purple, respectively. The Milky Way and M31 galaxies are shown by smaller spheres colored yellow and green, respectively. Others are colored blue. The time evolution runs from the past 13.25 billion years to present.
phinds said:"dark flow" seems to be a very problematic theory: https://en.wikipedia.org/wiki/Dark_flow
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?Arman777 said: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 ?
Oh wait I see now,phinds said: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?
According to their paper, the model does include the affects of the "Great Attractor."Arman777 said: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 http://www.fromquarkstoquasars.com/the-future-of-the-universe/, 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 http://www.fromquarkstoquasars.com/everything-you-need-to-know-about-dark-energy/. 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 http://www.fromquarkstoquasars.com/dark-flow/: a mysterious force tugging on galaxy clusters from beyond http://www.fromquarkstoquasars.com/from-quark-to-quasar-the-observable-universe-2/."
(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?
In addition, the alignment of major masses, from the Shapley Concentration (Raychaudhury 1989; Scaramella et al. 1989) through the Norma−Centaurus−Hydra complex (Great Attractor) (Lynden-Bell et al. 1988), to the Perseus−Pisces filament (Haynes & Giovanelli 1988) creates a strong tidal field at our location (Lilje et al. 1986; Dekel et al. 1999; Romano-D ́ıaz et al. 2005).
Thats nice..Its hard to see in the model I guess..I wish they could give it a color.|Glitch| said:According to their paper, the model does include the affects of the "Great Attractor."