It is obvious that all disk galaxies rotate once in 1 billion years

Bytonynetone

On Friday, March 9, 2018Royal Astronomical SocietyAccording to the contents announced in the monthly report ofDisk galaxyHas revealed that it rotates once every about one billion years regardless of its mass and size.

All disk galaxies rotate once every years years | Astronomy.com
http://www.astronomy.com/news/2018/03/all-galaxies-rotate-once-every-billion-years

AustralianInternational Radio Astronomy Research CenterAstronomer Gerhard Moirer said, "There is not as accurate as the Swiss watch, but if you were able to sit on the edge of a disk galaxy, I will come back to the same place all round regardless of its size It will take about 1 billion years. "

This discovery lies outside the disk against numerous galaxiesNeutral hydrogenofGaze speedIt seems that it was the trigger that I measured. It was understood that this measurement was able to calculate the rotation period of the galaxy, and it turned out that it takes 1 billion years for all the measured disk galaxies to make one revolution regardless of their size. Although further research is necessary to ensure that the rotation period like this clock is the universal characteristic of the disk galaxy, it is definitely a big discovery.

In this research researchers said that at the edge of the galaxy "young stars" and "Interstellar gas"Although it seems that he was also expecting to find a group only, in fact he found that he found a considerable number of old stars in addition to young stars and star gases.

ByHubble ESA

Moirer says, "This is an important discovery, because knowing where the edge of the galaxy is restricts our observations, we do not have to waste time, effort, and computer processing power Thanks to this research, I learned that the disk galaxy rotates once in about a billion years, and that the interstellar gas, young stars, and old stars are mixed on the edge of the disk I understand. "

In 2020 a new generation radio telescope "Square · Kilometer · Array (SKA)It is expected that the operation of the galaxy and other observation data will be generated in large quantities. Being a researcher thinking "Where is the end of the galaxy?" Before operation is started will create an idea for efficiently reading a large amount of data generated by SKA etc. It also leads to the development of research.