Astronomers have discovered galaxies merge frequency is gradually decreased

Harvard – Smithsonian Center for Astrophysics astronomer recently proposed a new theoretical model to calculate the frequency of galaxy mergers, the model can simulate approximately three hundred million light years of space in the galaxy formation process.


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Computer modeling of the structure of the universe. This graph shows the fibrous structure of matter in the universe and galaxies.

 

Beijing May 12, according to foreign media reports, the Harvard – Smithsonian Center for Astrophysics astronomer recently proposed a new computing galaxy mergers frequency theoretical model that can simulate the approximately three hundred million light-years across the universe Space galaxyformation. With the new theoretical models, astronomers have found conclusive evidence of galaxy mergers decreased in frequency. The researchers believe that this research will be able to achieve a variety of galaxy merger events after the formation of the universe ever accurate research.

In the past decade, our understanding of the universe in the Big Bang rapid increase, satellites and observation equipment on the base of the cosmic microwave background observation results also allow us to more accurate data understanding the early universe. However, after the Big Bang from today hundreds of thousands of years to 13.7 billion years after the universe what happened, we are still poorly understood. We know that the galaxy and star formation in the fibrous structure of matter in the early universe constantly cooled. As the universe continues to expand, they will re-air ionization, and then continue to evolve, and collisions with other galaxies merge. However, the distant galaxies very dark, difficult to detect. Although observation technology has made great progress, but astronomers still have to turn to the theoretical modeling and computer simulation modeling techniques.

Study on the frequency of galaxy mergers, currently there are three main theoretical approaches. The three different methods that the different simulated galaxies way. The first theoretical approach is not to simulate galaxy formation process using the basic principles, but the Galaxy “spray” in dark matter environment (the so-called dark matter halo) in. The second theory research methods, formation of mathematical simulation by a simple method of galaxies, dark matter halo and then use as a pillar of the model. The third method is the hydrodynamic simulation method, which attempts to simulate everything in the universe, such as dark matter, gas and stars and so on. However, this method is too difficult.

Harvard – Smithsonian Center for Astrophysics astronomer Vincent – Rodriguez – Gomez, Shi Yi – Ji Neier, Anna Lisa – Perry Paige, Dylan – Nielsen, Lars – Hull Enqvist, who proposed a new theoretical model to calculate the frequency of galaxy mergers in the numerical model. This method can simulate about three hundred million light years of space in the galaxy formation process, such a large space large enough to replicate many of the known properties of galaxies and clusters of galaxies, both now and also include the early universe.

With the new model theory, astronomers have found conclusive evidence of galaxy mergers decreased in frequency and understanding galaxy mergers features. 30 billion years after the Big Bang, approximately 15 times higher than the frequency of galaxy mergers today. In addition, the astronomers also found a galaxy merger process is the most useful data on the proportion of substance. The researchers claimed that their research results and other popular theory predicted result is completely different, and to clarify the observations of some vague concept. Experts believe that this theoretical model proposed opening a new phase of galaxy evolution further detailed study.

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