Astrophysicists from the International CenterRadio Astronomy Research (ICRAR), as well as the University of Western Australia, have come to interesting conclusions in recent studies: regardless of size and mass, all disk galaxies in the universe share one common detail - they all make one complete revolution around their axis in about 1 billion years .
Disk galaxies include lenticular andspiral like our Milky Way or Andromeda Galaxy nearby. And in this sense, disk galaxies can be compared to space clocks, scientists say in an article published in the journal The Monthly Notices of the Royal Astronomical Society.
“Of course, we are not talking about the level of accuracySwiss watches, but they all have one thing in common: no matter which galaxy we take - very large or tiny - being on the edge of this galaxy, you will make one revolution around its axis in about one billion years, ”explains the head of the study Gerhardt Meirer from the University of Western Australia.
The researchers came to this conclusion aftermeasuring the radial velocity of movement of neutral hydrogen of 130 galaxies that differ in size, in some cases 30 times. Astrophysicists note that the same velocity of rotation is characteristic of dense and large galactic objects, as well as clusters of a similar size, but much lower density.
Astronomers also note that using simple mathematical transformations it can be shown that all galaxies of the same size have approximately the same average internal density.
"The discovery of such a pattern in galaxieshelps to better understand the mechanics of their rotation - you won’t find a rapidly rotating dense galaxy, while another galaxy of the same size but smaller density rotates more slowly, ”says Professor Meirer.
In addition, scientists pay attention to oneAn interesting fact that they discovered in the framework of observations. On the outer border of the galactic disk are not only dense clusters of young stars and interstellar gas, but also a large number of much older stars mixed with young and interstellar gas. The galactic disk has a fairly clear boundary. This knowledge will help astronomers more accurately determine the boundaries of galaxies, which, in turn, will save resources when observing the boundary regions of galaxies.
Researchers make a reservation that forTo confirm the universality of their discovery with respect to the speed of galaxies, it is necessary to take measurements on a wider set of disk galaxies in order to completely eliminate any bias.