Galactic Cluster Suggests Hidden Superstructure 23
joncrie writes "The nearby galaxy cluster Fornax is facing an intergalactic headwind as it is pulled by an underlying superstructure of dark matter, according to new evidence from NASA's Chandra X-ray Observatory. Astronomers think most of the matter in the universe is concentrated in long large filaments of dark matter and that galaxy clusters are formed where these filaments intersect."
More information from article. (Score:4, Informative)
Fast Facts for Fornax Cluster:
Credit NASA/CXC/Columbia U./C.Scharf et al.
Scale Image is 47 arcmin across
Coordinates (J2000) RA 03h 38m 24.30s | Dec -35 27' 04.80"
Observation Time 5 days, 18 hours
Distance Estimate About 65 million light years
Dark Matter Superstructure... (Score:3, Funny)
Re:Dark Matter Superstructure... (Score:4, Funny)
According to Genesis, god was the only being in existence at the beginning of time and as such acted as both management and the workforce. This allowed him to be very efficient. Much theological discussion centres around when the first union came into being.
One possibility that has been suggested was that Lucifer formed the first union and it was an irreconcilable break down in industrial relations that caused the "war in heaven" ultimately leading to Lucifer and his union buddies being made redundant and going off to start "Hell Incorporated", now the universes leading provider of after death imprisonment for the wicked.
Others say that the first union came about when Adam and Eve were in the Garden of Eden. In this case a political agitator in the form of a snake caused considerable problems during a dispute over workers fruit eating rights. Some other accounts suggest that the snake was in fact a union representative sent by Lucifer, making this the second union.
Whatever the truth is is clear that the unions have throughout history lowered productivity, as the previous poster suggested. Before unions you could create a universe by simply saying "let there be light" now it takes 16 weeks to erect a pre-fabricated home.
Re:Dark Matter Superstructure... (Score:2, Funny)
Are you saying that there were no union-protection laws back then? Why didn't Lucifer simply sue god for unfair labor practices? Surely he
Re:Dark Matter Superstructure... (Score:5, Funny)
That would be because there are no lawyers in heaven :-)
Re:Dark Matter Superstructure... (Score:4, Funny)
Re:Dark Matter Superstructure... (Score:1)
Sci-fi (Score:2, Funny)
Sad. (Score:5, Insightful)
This *should* be the story of the week - the first possibly solid clues as to the macro structure of the universe. These features are on an absolutely enormous scale - to prove that there is a larger structure to the universe will give us the first idea of what's out there. Of what shape the universe is and even possibly clues as to how it came into being - and where it's going.
This is profound science. But as with most mind-boggling and cutting edge science, it gets ignored or joked about by the average Joe. It's disapointing really, but I suppose I should know not to expect anything more from the average human than the ability to eat, sleep and reproduce - let alone intelligently explore the universe they inhabit.
Re:Sad. (Score:4, Funny)
Seems that you tilted the balance in the wrong direction
Re:Sad. (Score:1, Interesting)
I am pretty much stunned that there is evidence of something on this scale, but the articles are fairly light on details, and I didn't really know what else to say. If you asked my opinion, I'd say it validates a lot of my own theories that the Universe is not a bunch of dense spots moving through an empty void, but rat
Re:Sad. (Score:1)
Hmm..."imagine God deciding to do a little dust cleaning. It might look something like this: , and there go billions of cubic light years of the universe!"
Filament = lensing? (Score:2, Interesting)
Dark matter in filaments implies gravitional lensing
Any news on that?
Re:Filament = lensing? (Score:5, Interesting)
To get gravitational lensing, one has to have a sufficient integrated density along the line of sight. It is fair to surmise that looking "down the pipe" of a filament might produce enough integrated density to produce lensing, but it is not a necessary consequence.
I haven't heard of any lensing based on filament structures, but the folks who do what is called "weak lensing" might have some statistical arguments that can correlate their results with the likely (or unlikely) presence of filaments.
The main result I remember associated with filaments is the apparent clumpiness of the galaxy distribution on small scales. If you've got a lot of linear structures where galaxies form, then you get more super-positions of galaxies than would occur in a random distribution. Such arguments can explain the over-numerous of Hickson Compact Groups of Galaxies.
For those who would like to know what a "filament" might look like, you can see my visualization of large scale structure in the universe called "Cosmic Cruising 2" at http://terpsichore.stsci.edu/~summers/viz/cosmic_c ruising_2/ [stsci.edu]. Please note that this visualization is not from observed galaxy data, but rather from a supercomputer simulation that has roughly the same statistical properties as the real universe.
Re:Filament = lensing? (Score:5, Informative)
[TMB]
Matrioshka Brains? (Score:5, Interesting)
Mike
Re:Matrioshka Brains? (Score:2)
While Matrioshka brains are indeed fascinating structures, they could only account for baryonic dark matter. The vast majority of dark matter is non-baryonic (in the astronomical sense, which differs somewhat from the particle physics sense, but in this case still means "not normal matter").
Re:Matrioshka Brains? (Score:1)
This solution also lays to rest the vexing problem known as the Fermi paradox, a.k.a. where the hell are all the aliens? The answer is everywhere--dark matter marks the tombstones of
Just one question... (Score:1)
Re:Just one question... (Score:3, Informative)
It's not being pulled by a headwind. It's facing a headwind.