Shocking results of galaxy-cluster collisions

November 7, 2017
Composite image of Abell 2744 region, with radio, X-Ray, and optical (visible light) data combined. Credit: Pearce et al.; Bill Saxton, NRAO/AUI/NSF; Chandra, Subaru; ESO.

A giant collision of several galaxy clusters, each containing hundreds of galaxies, has produced this spectacular panorama of shocks and energy. The collisions generated shock waves that set off a celestial fireworks display of bright radio emission, seen as red and orange. In the center of the image, the purple indicates X-rays caused by extreme heating.

The region is collectively known as Abell 2744, some 4 billion light-years from Earth. The radio portion of the image comes from new observations made with the National Science Foundation's Karl G. Jansky Very Large Array (VLA), and is combined with earlier data from NASA's Chandra X-ray observatory. Both are overlaid on an image at visible-light wavelengths made with data from the Subaru telescope and the Very Large Telescope (VLT). The new VLA observations revealed previously undetected regions where shocks accelerated subatomic particles, causing radio emission.

Astronomers are studying the combined image in an attempt to decipher the sequence of galaxy-cluster collisions. Currently, they said, evidence indicates a North-South (top-bottom in the image) collision of subclusters and an East-West (left-right in the image) collision. There is a possible third collision, and the astronomers continue to analyze their data to uncover more details about the region's complex history of collisions and their aftermath.

The scientists reported their findings in a paper in the Astrophysical Journal by Connor Pearce, of the Harvard-Smithsonian Center for Astrophysics and the University of Southampton in the UK, and an international team of colleagues.

Radio-only image of Abell 2744 region, showing radio-emitting features caused by subatomic particles accelerated to high speeds by the collisions of giant clusters of galaxies. Credit: Pearce et al., NRAO/AUI/NSF

Animated GIF cycles through the individual images (radio, X-ray, optical) of Abell 2744. Credit: Pearce et al.; Bill Saxton, NRAO/AUI/NSF; Chandra; Subaru; ESO.

Explore further: A violent, complex scene of colliding galaxy clusters

More information: "VLA Radio Observations of the HST Frontier Fields Cluster Abell 2744: The Discovery of New Radio Relics," C. J. J. Pearce, 2017 Aug. 10, Astrophysical Journal iopscience.iop.org/article/10. … 847/1538-4357/aa7e2f , Arxiv: arxiv.org/abs/1708.03367

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16 comments

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Tuxford
1.3 / 5 (12) Nov 07, 2017
The collisions generated shock waves that set off a celestial fireworks display...

Oh that explains it! LOL.

Astronomers are studying the combined image in an attempt to decipher the sequence of galaxy-cluster collisions.

Afterall, the common merger maniac may not consider any other possibility other than collision. His brain is locked.
Parsec
4.6 / 5 (11) Nov 07, 2017
@Tuxford - when you are driving down the freeway and see two cars locked together burning, it is a safe bet that they collided. It is possible I suppose that someone could have towed the vehicles together, thrown flammable fuel over the debris, and set them on fire, but it would be quite difficult to simulate the kinds of metal deformation that occurs in a collision.

The same thing is true here. The evidence for collisions is overwhelming. It is the exact sequence of collisions that remain unknown.
cantdrive85
1.4 / 5 (11) Nov 07, 2017
The plasma ignoramuses only have gravity to explain these phenomena, however these are in fact electromagnetic/electrodynamic phenomena driven by electricity flowing throughout the IGM.
Chris_Reeve
1.4 / 5 (10) Nov 08, 2017
"The greatest mistake in my opinion, and the one we continually make, is to let the theory guide the model. After a ridiculously long time it has finally dawned on me that establishment scientists actually proceed on the belief that theories tell you what is true and not true!"

- Halton Arp, Seeing Red
Da Schneib
5 / 5 (7) Nov 08, 2017
People who reject evidence in astrophysics are going on faith. That's not science. It's religion.
It's right there. You can see it. Nowhere to run, nowhere to hide.
jonesdave
5 / 5 (9) Nov 08, 2017
The plasma ignoramuses only have gravity to explain these phenomena, however these are in fact electromagnetic/electrodynamic phenomena driven by electricity flowing throughout the IGM.


Lol.
somefingguy
4.6 / 5 (10) Nov 08, 2017
The plasma ignoramuses only have gravity to explain these phenomena, however these are in fact electromagnetic/electrodynamic phenomena driven by electricity flowing throughout the IGM.


Do you actually feel like you are accomplishing anything by going on every Physics article and commenting the exact same thing over and over, and receiving the same responses every time?
I mean it is clear that your favorite phrase is "Plasma Ignoramuses", but can you actually write a paper and collect your Nobel Prize since you are so sure of yourself (well most likely the opinion of the person who came up with the actual theory you seem to cling on to like it's God) that every single scientist is wrong?
Tuxford
1 / 5 (6) Nov 08, 2017
The evidence for collisions is overwhelming. It is the exact sequence of collisions that remain unknown.

See, an automatic reaction from a cheering merger maniac with brain lock. He is simply incapable of considering alternatives. And he receives immediate celebration from relieved supporters, also unable to think different. So together they will pound away on their lifelong expanding dream, despite ample contrary inconvenient evidence, chalking it up to some as yet undiscovered key information that will someday reconcile the numerous inconsistencies. That's it. They are smart. Just missing a bit of info.
nikola_milovic_378
Nov 11, 2017
This comment has been removed by a moderator.
jonesdave
5 / 5 (5) Nov 11, 2017
The plasma ignoramuses only have gravity to explain these phenomena, however these are in fact electromagnetic/electrodynamic phenomena driven by electricity flowing throughout the IGM.


Do you actually feel like you are accomplishing anything by going on every Physics article and commenting the exact same thing over and over, and receiving the same responses every time?
I mean it is clear that your favorite phrase is "Plasma Ignoramuses", but can you actually write a paper and collect your Nobel Prize since you are so sure of yourself (well most likely the opinion of the person who came up with the actual theory you seem to cling on to like it's God) that every single scientist is wrong?


Well said!!! Too many eejits around here. Unqualified eejits, might I say.
jonesdave
5 / 5 (5) Nov 11, 2017
What could have happened there 4 billion years ago?
It certainly could not have reached the galaxy of several galaxies.
This phenomenon is not clear to scientists because they do not know the structure of the universe. It is the process of forming galaxies from a giant magnet, from which a dozen large galaxies can be formed, but there may also be a pair of magnets that are spaced at several hundred thousand light years.


Dafuq are you on about? Seriously?
Da Schneib
5 / 5 (4) Nov 12, 2017
@Tux can't differentiate between galaxy mergers and galaxy cluster mergers.

The whole point, @Tux, is that gravity sucks. It's the force that doesn't have an anti. Over time, gravity always wins.
Benni
1 / 5 (5) Nov 12, 2017
What could have happened there 4 billion years ago?
It certainly could not have reached the galaxy of several galaxies.
This phenomenon is not clear to scientists because they do not know the structure of the universe. It is the process of forming galaxies from a giant magnet, from which a dozen large galaxies can be formed, but there may also be a pair of magnets that are spaced at several hundred thousand light years.


Dafuq are you on about? Seriously?


Coming from someone who has never seen a Differential Equation he could solve.......
Tuxford
3 / 5 (2) Nov 12, 2017
@Tux can't differentiate between galaxy mergers and galaxy cluster mergers.

The whole point, @Tux, is that gravity sucks. It's the force that doesn't have an anti. Over time, gravity always wins.

Ha. Ha. Ha. Brilliant insight. Simply brilliant. Congratulations. You shine! Smile.
jonesdave
4.2 / 5 (5) Nov 12, 2017
What could have happened there 4 billion years ago?
It certainly could not have reached the galaxy of several galaxies.
This phenomenon is not clear to scientists because they do not know the structure of the universe. It is the process of forming galaxies from a giant magnet, from which a dozen large galaxies can be formed, but there may also be a pair of magnets that are spaced at several hundred thousand light years.


Dafuq are you on about? Seriously?


Coming from someone who has never seen a Differential Equation he could solve.......


Ahhh, the D-K affected janitor is back!
Benni
1 / 5 (1) Nov 12, 2017
the D-K affected janitor is back!


I wonder if Dunning and Kruger's research also indicates that training in a task, such as your name calling skills, increases your ability to accurately evaluate how good you are at it.

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