Galactic winds help explore galaxies

Galactic winds help explore galaxies

Instead of pushing, the simulation demonstrates the heating of a cold material.

When scientists look at space, they face many different surprises. This also applies to low-mass galaxies. These are small systems represented by billions of stars, dust and gas. However, models show that such galaxies should contain more stars.

The theory of inconsistencies is based on phonelike gas outflows. They are caused by the existence and death of stars. Winds and supernova explosions are especially strongly influenced, and the galactic wind all together forms. Stellar activity displaces gas into intergalactic space, and galaxies lose raw materials for stellar birth.

To understand the process of galactic wind effect on stellar formation, scientists decided to use a super-computer to create a model. The best conditions are offered by Titan, therefore it was possible to remove the hot supernova wind, which faces a cool gas cloud after 300 light years. Now the team is going to generate a trillionth model of the entire galactic space. In addition, they are trying to get new ones doing the characteristics of the galactic winds and the forces governing the galaxies.

Model of cold clouds

At a distance of 12 million light years is the disk galaxy M82. It is shaped like a cigar and creates stars 5 times faster than the speed of the Milky Way. This leads to a powerful stellar wind that pushes a lot more gas than the system can hold. It is believed that the fuel will be fully released in 8 million years.

Using images of the Hubble telescope, researchers can view the slow process of dust and gas.

Cool Cloud from OLCF on Vimeo.

On such scales it is very convenient to study the movement of cold material. But in order to study the process in detail, it is necessary to derive an effective code that would solve the problem with the movement of fluids. The Cholla project is used to calculate fluid dynamics on graphics processes that achieve higher results. When testing, the code supported the scaling of 16,000 graphics processes. These tools helped create models of gas clouds with a diameter of 15 light years. The ability to view the wind in isolation helped to study the theory, where cold clouds close to the galactic center are displaced by the hot winds of supernovae.

In fact, the heated wind mows these clouds, making them too narrow. They just begin to resemble small ribbons.

Galactic targets

Now scientists are planning to create a galactic model 10-20 times larger than the previous one. This will help to verify an alternative theory of the appearance of galactic wind in disk types, such as M82. According to her, clouds of cold gas are condensed because of the hot outflow.

Creating a model of a complete galaxy needs hundreds of billions of cells, representing 30,000 light years of space. To do this, you have to sacrifice permission.

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