The imbalance of the Galaxy: the strange gas glut

Beijing time on November 4th, beijing news,  the Galaxy seems to have some kind of imbalance. In a new study, astronomers have discovered a strange gas glut in the Milky Way. Using data from NASA’s Hubble Space Telescope for 10 years, a team of astronomers has concluded that more gas enters the Milky Way than it leaves. However, the team has yet to find the reason for the significant imbalance in which the gas enters and escapes.

银河系的不平衡:存在奇特的气体过剩现象

This image shows how gases rise and fall in the Milky Way. Using 10 years of data from Hubble’s Cosmic Origin Synod, astronomers have found that more gas enters the Milky Way than it leaves.

The researchers used data from the Hubble Origin Spectrograph, or COS. The instrument’s role is to study objects that absorb or emit light and to determine their temperature, chemical composition, velocity, and density to study the origin of the universe’s large-scale structure, the formation and evolution of galaxies, and the origin of the mediums of stars, planets and cold galaxies. With the Cosmic Origins Spectrometer, researchers can observe and track the motion of gases in galaxies: when they are far away from the Milky Way, their colors look redder, and the redand and blue shift effects make them look bluer when they are close to the Milky Way.

银河系的不平衡:存在奇特的气体过剩现象

The orbits of the next three spiral galaxies: the Milky Way in blue, the Andromeda galaxy in red, also known as M31, and the green trigonometry galaxy, also known as M33. A study based on observations from the European Gaia mission suggests that the Milky Way and The Andromeda will collide in 4.5 billion years.

The researchers found that more “blue” gases enter the Milky Way than “red” gases leaving the Milky Way. Although the researchers have not yet found the root cause of this imbalance, they believe it may be one of three reasons.

First, astronomers believe the extra gas may have come from interstellar media. Second, the Milky Way is using gravity to extract gas from smaller galaxies nearby, the researchers said in a statement. In addition, the study only considered colder gases, and the researchers believe that hotter gases may also be associated with this imbalance.

Events such as supernovae and stellar winds push gas out of the Milky Way’s disk, causing it to leave the Milky Way. In contrast, when gas enters the Milky Way, it will help the formation of new stars and planets. Therefore, the balance between the inflow and outflow of gas is important to regulate the formation of objects such as stars in the Milky Way.

“A detailed study of the galaxies we live in could provide a basis for understanding galaxies throughout the universe,” said Philipp Richter of the University of Potsdam in Germany, one of the study’s authors, in a statement. We have realized that the Milky Way is much more complex than we think. “The results of this study will be published recently in the Astrophysical Journal.

The collision of the Milky Way and the Andromeda Galaxy

The Milky Way may have stayed in its current form longer than some astronomers think, according to a study. The Milky Way will collide on a massive scale with the spiral galaxy Andromeda 4.5 billion years from now, according to observations based on the European Gaia space telescope. Some astronomers had predicted that the collision could have happened sooner, about 3.9 billion years later.

Gaia mission scientist Timo Prusti was not involved in the study, but said the findings are critical to our understanding of how galaxies evolve and interact. The Gaia mission was launched in December 2013 to help researchers create the best three-dimensional map of the Milky Way ever. So far, the Gaia mission has accurately monitored the positions and movements of a large number of stars and other cosmic objects, and the team aims to track more than 1 billion stars over the life of the mission.

Most of the stars that Gaia’s mission focuses on are in the Milky Way, but some are located in neighboring galaxies. For the study, researchers tracked stars in the Milky Way, Andromeda (M31) and Delta (M33). The neighboring galaxies are about 2.5 to 3 million light-years from the Milky Way and are likely to interact, the team said.

“We need to explore the motion of galaxies from a three-dimensional perspective to reveal how they grow and evolve, and what created and influenced their characteristics and behavior,” study lead author Roeland van der Marel of the Space Telescope Science Institute in the United States said in a statement. We did this with the second set of high-quality data released by the Gaia mission. He was referring to a set of data released by the Gaia mission in April 2018.

The researchers say the work determines the rotation speed of the Andromeda and Trianome sylweding galaxies, which have never been done before. Using observations from the Gaia mission and an analysis of archival information, the team mapped the movements of the Andromeda and Triathrow galaxies over the past and predicted where they might move over the next billion years.

Simulations by the team showed that the Andromeda galaxy and the Milky Way collided later than previously thought, suggesting that it would be a side collision rather than a frontal collision. Because the distance between stars is so far away, the likelihood of the solar system being destroyed by galaxy mergers is very low. But for any living thing on Earth 4.5 billion years away, if anything, the impact is sure to make the night sky shine.

The main design of the Gaia mission was to map stars in the Milky Way, but this study suggests that the telescope is exceeding expectations and providing unique insights into the structure and dynamics of galaxies outside the Milky Way. The longer the Gaia mission has observed the motion of these galaxies, the more accurate the measurements will be. The study was published in the February 2019 issue of the Astrophysical Journal.

It’s worth noting that the Andromeda galaxy is not the next galaxy to hit the Milky Way: a recent study suggests that the Great Magellanic Cloud and the Milky Way will merge in about 2.5 billion years. However, the Large Magellanic Cloud itself is the brightest and largest in the Milky Way’s satellite galaxy, and has an interactive bridge between the Milky Way. The large Magellanic cloud is much smaller than the Milky Way, so it is possible to be torn apart by the Milky Way as it passes through it. In fact, there are more than 100 satellite galaxies around the Milky Way, any of which is likely to pass through the Milky Way or even near the solar system. Fortunately, the probability of such a collision is small, and it is likely to be a “passing pass” rather than a hard collision like an asteroid hitting Earth.

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