The scarcity of dark matter in the NGC1052-DF4 galaxy has puzzled astronomers, but now, researchers from the Canarias Institute of Astronomy and other international centers have found a mechanism to explain this phenomenon: the tides are caused by the gravitational pull of nearby galaxies. Caused by interaction.
Last year’s researchers Institute of Astrophysics of the Canary Islands (IAC) They found that the Milky Way NGC1052-DF2 is much closer than previously thought, thus clarifying the mystery of the absence of dark matter in the galaxy NGC1052-DF2.
Now they explain the scarcity of dark matter in another galaxy, NGC1052-DF4It has plagued the astronomy community for many years.In this case, the explanation is in Tides caused by gravity With another close person.The research was published in Astrophysical Journal.
So far, it is impossible to explain the lack of dark matter in NGC1052-DF4 without destroying the accepted cosmological model. Although in such ancient galaxies, relative to most dark matter, the mass of stars usually accounts for only 1%, but in this case, dark matter has been found to account for less than 50%.
However, the mystery was finally solved. Astronomers discovered in NGC1052-DF4 that the tides caused by the gravitational interaction of nearby massive galaxies caused profound changes in the distribution of matter. NGC1035. This research shows that huge galaxy systems can exert gravitational interactions on their neighboring galaxies, thereby profoundly changing their structure until they destroy them.
He explained that these forces affect dark matter at first, “because the stars are more concentrated, and then they begin to be affected, and the dark matter has actually been eliminated.” Mireia Montes, An astrophysicist, holds a PhD in IAC, and led research at the University of New South Wales in Australia.
Ground tides that occur on the moon
Due to the gravity exerted by the moon, the observations are similar to what happens on Earth. He pointed out: “The mechanism is known, but it has not been observed in this type of galaxy with extremely low star density.” Ignacio TrujilloHe is an astrophysicist at IAC and one of the leaders of this work.
This is exactly the result of this research: “In a galaxy 65 million light-years away, the detected faint features are 1,000 times weaker than the night sky visible on Earth.”
This type of research is called “Low surface gloss scienceIn order to obtain the image, the person in charge used the Hubble Space Telescope, the Gran Telescopio Canarias (GTC) of the Roque de los Muchachos Observatory (Garavia, La Palma) and the IAC-80 of the Observatory Delteide ( Tenerife, Isania). But not in the traditional way.
He said that although astronomers usually need half an hour of exposure time, the work requires 60 hours of exposure, which is “quite complicated.” Raul Infant Sainz, An expert in charge of analyzing low-brightness areas, and another expert in charge of IAC work.
Moreover, in addition to the time required to reach these extremely low star densities, “you must also reduce the data appropriately to obtain low surface brightness structures, which are hidden under their initial noise level. There are images.”
Laguna University, the Andalusian Institute of Astrophysics (IAA-CSIC) and NASA also participated in this detailed study, explaining that there is no dark matter in NGC1052-DF4, which helps to make the observations consistent with The galaxy model is consistent. The most accepted formation and evolution in the international astronomy community.
Mireia Montes et al. “The Milky Way’s’lack of dark matter’ NGC1052-DF4 is suffering tidal damage.” Astrophysical Journal, 2020 year