Friday , November 27 2020

Scientists say the edge of the galaxy hides a huge galaxy of ghosts. British Media: There is still an unknown mystery – International Online



Reuters News Network reported on Nov. 24 that the British media said that behind the vacuum cleaner and the gas disk that represents the Milky Way, there is a galaxy ghost that looks different from the other galaxies people have seen before. Or at least that's what some astronomers say – but another researcher questioned his findings.

According to the new "New Scientist" newbie on Nov. 16, the newly discovered dwarf galaxies are one-third of the size of the Milky Way. It is located in the constellation Antria, 450 million light-years from Earth. It is called "Antelia-2" – or "Ante-2".

Researcher Gabriel Torreva said: "This is similar to some galaxies around the Milky Way, and we know they have been for many years, but this is 10 times the size of these galaxies, and the brightness spreads in the sky. very fragmented and therefore harder to find. "

According to reports, he and his team have captured "Ante-2" with a bright star named RR Lyle, and RR Lyle's bright stars change vibration, illuminate and darken for a long time. As you know, almost every small galaxy that circles around the Milky Way has at least one such signal that works in sync with the surrounding stars.

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Huge ghost

According to the report, Torre Yarwa and his associates use the four RR Lyle stars watched by the Gaia satellite to track the position and movement of nearby stars and draw the Milky Way and its surroundings. The team found that the multitude of pulsating stars are moving together.

The report says they measure the light of 100 red giant stars around the four RR stars and find that they are moving at the same speed, which means they belong to the same galaxy. But these stars also show that the galaxies they are in are strange.

Based on the distance, the research team concluded that "Ante-2" is enormous, covering about 9,500 light-years. But for such a huge galaxy it is extremely gloomy. This is because its diffusion range is even 100 times larger than the so-called hyperdiffusion galaxy. This means that the brightness of the surface of "Ante-2" is the lowest of the known star systems.

Torre Yalva believes this may be due to the dark matter of the Milky Way. It can be evenly distributed in "Ante-2" rather than concentrating in the center, as in most galaxies. This could allow Ante-2 to keep its huge volume in case of mass loss due to the gravitational impact of the Milky Way.

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A strange galaxy

However, Gisela Clementini of the Italian National Institute of Astrophysics said that before we can know how unusual the characteristics of Ante-2 are, there are some questions to answer. She studied the RR stars seen by the Gaia satellite and said there was a mistake in the formula used by the Torreyalava team to calculate the distance from Ante-2.

When she noticed this, she asked her to cooperate with her associates in Bologna and Naples, who all thought she had a problem with measuring distance. This is a serious problem because the characteristics of this galaxy are so unusual only when the galaxy is so far away from us, as the Estai team estimates.

Clementini said she reminded the team to address this issue and they agreed that they should review. She said, "They found something, but at this point, if we can not confirm the calculation, I can not bet any system ownership."

Clementini said that the RR Lyle star may not belong to the galaxy, but it may be in front of the galaxy. If this is the case, the research team that "Ante-2" is pure luck. If the distance from the galaxy is much larger than we think, then its size will be more extreme. But if closer, it looks more like an ordinary dwarf galaxy.

Torres Jarva said the error in its distance formula makes RR Lair a star about 260,000 light-years away from Earth instead of the initial 424,000 light-years. But they use two other methods to confirm the distance of the other stars in "Ante-2". He said a galaxy such as "Ante-2" should have hundreds of variable stars and this group is the closest. He also said that the new calculations did not change the strange character of "Ante-2".

Alan McConaughe of the University of Victoria in Canada said: "To make the unusual part of the galaxy less unusual, then its distance should be twice as big, if you change it by 10% or 20% it's still very strange object type. "

He said that we have long known that the "missing" galaxies are hidden behind the gas and dust of our Milky Way. There is also a small number of equally large and scattered galaxies like Crater 2 and Andromeda 19. He said, "Whether it's a few extreme objects or the tip of the iceberg of a new type of galaxy, we must know that urgently."

The report says that if the galaxy is more varied than the galaxy is surrounded by convex dwarf galaxies, then people may have to rewrite the understanding of how the dark matter in the universe and its star collection mechanism are spreading. (Compile / Hu Wei)

(Original title: Scientists say the galaxy hides a gigantic galaxy galaxy on the edge of the Milky Way British media: no secret yet)

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