In our 13.8 billion-year-old universe, most galaxies like our Milky Way form gradually, reaching their large mass relatively late. But a new discovery made with the Atacama Large Millimeter/submillimeter Array (ALMA) of a massive rotating disk galaxy, seen when the universe was only ten percent of its current age, challenges the traditional models of galaxy formation. This research appears on 20…
Tag: galaxy formation
The Milky Way’s satellites help reveal link between dark matter halos and galaxy formation
Just as the sun has planets and the planets have moons, our galaxy has satellite galaxies, and some of those might have smaller satellite galaxies of their own. To wit, the Large Magellanic Cloud (LMC), a relatively large satellite galaxy visible from the Southern Hemisphere, is thought to have brought at least six of its own satellite galaxies with it when…
Galaxy formation simulated without dark matter
For the first time, researchers from the Universities of Bonn and Strasbourg have simulated the formation of galaxies in a universe without dark matter. To replicate this process on the computer, they have instead modified Newton’s laws of gravity. The galaxies that were created in the computer calculations are similar to those we actually see today. According to the scientists, their…
Supermassive black hole at the center of our galaxy may have a friend
Do supermassive black holes have friends? The nature of galaxy formation suggests that the answer is yes, and in fact, pairs of supermassive black holes should be common in the universe. Source: https://phys.org/news/2019-12-supermassive-black-hole-center-galaxy.html…
A second black hole at our galaxy’s center?
There’s a supermassive black hole – 4 million times our sun’s mass – in the center of our Milky Way galaxy. Astronomers who’ve measured star movements near this central black hole are now saying there might be a 2nd companion black hole near it. Source: https://earthsky.org/space/supermassive-black-hole-milky-way-galaxys-center-may-have-friend…
Astronomers Find 19 More Galaxies Missing Their Dark Matter
Iwastheone shares a report from Astronomy.com: Astronomers have discovered 19 more galaxies missing their dark matter. Instead of dark matter, these strange galaxies are mainly filled with regular matter, like the protons, neutrons, and electrons that make up everything we’re familiar with. The new find, published November 26 in Nature Astronomy, bolsters the controversial recent discovery of two other galaxies without…
NASA’s Webb to unveil the secrets of nearby dwarf galaxies
In two separate studies using NASA’s upcoming James Webb Space Telescope, a team of astronomers will observe dwarf galaxy companions to the Milky Way and the nearby Andromeda galaxy. Studying these small companions will help scientists learn about galaxy formation and the properties of dark matter, a mysterious substance thought to account for approximately 85% of the matter in the universe….
Cosmic web fuels stars and supermassive black holes
Astronomers probed the cosmic web, a large-scale structure composed of massive filaments of galaxies separated by giant voids. They found the filaments also contained significant amounts of gas, believed to help fuel the galaxies’ growth. Source: https://earthsky.org/space/cosmic-web-gas-reservoir-fuel-galaxies-growth…
Virtual ‘universe machine’ sheds light on galaxy evolution
How do galaxies such as our Milky Way come into existence? How do they grow and change over time? The science behind galaxy formation has remained a puzzle for decades, but a University of Arizona-led team of scientists is one step closer to finding answers thanks to supercomputer simulations. Source: https://phys.org/news/2019-08-virtual-universe-machine-galaxy-evolution.html…
When our Milky Way merged with an ancient dwarf galaxy
Analysis of measurements via the Gaia space telescope – of star positions, brightnesses and distances – has let astronomers probe a merger 10 billion years ago between the primitive Milky Way and a dwarf galaxy called Gaia-Enceladus. Source: https://earthsky.org/space/gaia-enceladus-collision-milky-way…