Astronomers have found new evidence for galaxies without dark matter.

For 40 hours, an international team of astronomers led by researchers from the Netherlands took detailed measurements with modern telescopes, but found no traces of dark matter in the galaxy AGC 114905. The results of the study will soon be published in the journal Monthly Notices of the Royal Astronomical Society.

Scientists have studied the galaxy AGC 114905, which is located at a distance of 250 million light years from Earth. It is classified as an ultradiffuse dwarf galaxy and, due to its low luminosity, is considered a dwarf galaxy. It’s not about its size – in terms of length and diameter, it is similar to the Milky Way, but it has a thousand times fewer stars. Science suggests that all galaxies and, of course, ultradiffuse dwarf galaxies can exist only if they are “held together” by dark matter.

Researchers collected data on gas rotation in AGC 114905 for 40 hours between July and October 2020 using the Very Large Array (VLA) telescope in New Mexico, USA. They subsequently built a graph that shows the distance of the gas from the center of the galaxy on the x-axis and the rate of rotation of the gas along the Y-axis. This is the standard way to detect the presence of dark matter. As a result, the graph showed that the movement of gas in AGC 114905 is completely explained by ordinary substance.

“This confirms our previous measurements,” explains Pavel Manchera Pigna. “But now we are faced with a new problem: according to the generally accepted theory, there should be dark matter in AGC 114905, but observations say no. In fact, the difference between theory and observation only widens.”