Research: Ancient galaxies contain high-density dark matter


A study published by NASA earlier in the month revealed that the galaxy Markarian 1216 (Mrk 1216) has a feature that is more interesting to astronomers than its internal stars: “the older” stars: The density of dark matter is much larger than estimated.

Astronomers believe that the stars in this galaxy are concentrated in a billion years after the Big Bang, that is, they are almost the same age as the universe. But in particular, the galaxy and its stars have ceased to evolve about 10 billion years ago, like a galaxy that has been “storage” for billions of years.

Researchers at the University of California used the data from the NASA Chandra X-ray Observatory to study the brightness of the X-rays and the temperature of the hot gases in the galaxy from the center of the galaxy to “weigh” the central part of the galaxy. The quality of “dark matter”.

Research: Ancient galaxies contain high-density dark matter

David Buote of the University of California said in a research note that the comparison found that the dark matter density of the Mrk 1216 is much higher than other similar galaxies.

“Dark matter” is a concept generally accepted by the astronomical community to explain the insufficiency of visible matter in the universe to form the gravitational pull of the galaxy’s self-contained system. Astronomers estimate that dark matter accounts for more than 85% of the total amount of matter in the universe. However, dark matter has never been directly observed or measured.

Researchers hope that this study will enhance understanding of the properties of dark matter. “Non-standard theory holds that certain denser dark matter particles interact in a non-gravitational manner, and the density of dark matter in the center of Mrk 1216 will provide a basis for such theory.”

Research: Ancient galaxies contain high-density dark matter

The study was recently published in The Astrophysical Journal.


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