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An image comparing the data showing the many galaxies and the X-ray emission from the hot gas
An image comparing the data showing the many galaxies and the X-ray emission from the hot gas (left) with the model of the hot gas (right). The "comet" shape of the X-ray data is well reproduced by the model. Credit: Image courtesy of University of the Basque Country

Maybe dark matter is not made up of heavy particles after all

Tom Broadhurst, the Ikerbasque researcher in the Department of Theoretical Physics of the UPV/EHU, together with Sandor Molnar of the National Taiwan University and visiting Ikerbasque researcher at the UPV/EHU in 2013, have conducted a simulation that explains the collision between two clusters of galaxies. Clusters of galaxies are the biggest objects that exist in the universe. They are collections of hundreds of thousands of galaxies pulled together by gravity.

In general, galaxy clusters grow in size by merging with each other to become increasingly larger. Gravitational forces cause them to slowly come together over time despite the expansion of the universe. The system known as “El Gordo,” the biggest known cluster of galaxies, is in turn the result of the collision between two large clusters. It was found that the collision process compresses the gas within each cluster to very high temperatures so that it is shining in the Xray region of the spectrum. In the Xray spectrum this gas cloud is comet shaped with two long tails stretching between the dense cores of the two clusters of galaxies. This distinctive configuration has allowed the researchers to establish the relative speed of the collision, which is extreme (~2200km/second), as it puts it at the limit of what is allowed by current theory for dark matter.

These rare, extreme examples of clusters caught in the act of colliding seem to be challenging the accepted view that dark matter is made up of heavy particles, since no such particles have actually been detected yet, despite the efforts being made to find them by means of the LHC (Large Hadron Particle Collider) accelerator in Geneva and the LUX (Large Underground Xenon Experiment), an underground dark matter detector in the United States. In Tom Broadhurst’s opinion, “it’s all the more important to find a new model that will enable the mysterious dark matter to be understood better.” Broadhurst is one of the authors of a wave-dark-matter model published in Nature Physics last year.

This new piece of research has entailed interpreting the gas observed and the dark matter of El Gordo “hydrodynamically” through the development of an in-house computational model that includes the dark matter, which comprises most of the mass, and which can be observed in the Xray region of the visible spectrum because of its extremely high temperature (100 million kelvin). Dr Broadhurst and Dr Molnar have managed to obtain a unique computational solution for this collision because of the comet-like shape of the hot gas, and the locations and the masses of the two dark matter cores that have passed through each other at an oblique angle at a relative speed of about 2200 km/s. This means that the total energy release is bigger than that of any other known phenomenon, with the exception of the Big Bang.


Story Source:

The above story is based on materials provided by University of the Basque Country. Note: Materials may be edited for content and length.


Journal Reference:

  1. Sandor M. Molnar, Tom Broadhurst. A HYDRODYNAMICAL SOLUTION FOR THE “TWIN-TAILED” COLLIDING GALAXY CLUSTER “EL GORDO”. The Astrophysical Journal, 2015; 800 (1): 37 DOI: 10.1088/0004-637X/800/1/37
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  • David Ring

    I think this excerpt ends up being more confusing than helpful. It is not really clear why a resemblance to the hot gas pattern associated with a comet yields an understanding of the galaxy “collision.” What would be helpful would be a simulation showing the galaxies prior to collision and the theoretical location of the “dark matter” “at the center of each” (isn’t that supposed to be one or more super massive black holes as in our galaxy and other observable ones nearby rather than dark matter?). The simulation would show how the gasses that may constitute dark matter are forced to heat up until they become “visible” in the x-ray range. Wouldn’t this same matter have to pass through a level of incandescence where there would be “visible” light emissions which would enable a spectrum of the atomic constituents of the gas to be evaluated by a spectrum analyzer? Since any matter presumably can be forced to heat up sufficiently to emit an x-ray spectrum, might it be possible to “cool down” or reverse such a spectrum back into the visible light range as a basis for comparison or do we already have the equivalent of an x-ray footprint for all forms of hot matter and only need to set them side by side for comparison in order to see what elements the so-called dark matter is comprised of?

 
 
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