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Tag: galaxies

Mergers may have stunted growth of early galaxies

Mergers may have stunted growth of early galaxies

Science
Jan. 11 (UPI) -- Galaxy mergers in the early universe may have curbed star formation and stunted the growth of young galaxies, according to a new study published Monday in the journal Nature Astronomy. Over the years, scientists have observed large numbers of massive, dead galaxies in the nearby universe. Astronomers have struggled to explain how these galaxies, populated mostly by dead stars, came to be. Advertisement In a new paper, researchers suggest an ancient galaxy merger called ID2299 can offer clues. Using images captured by the European Southern Observatory's Atacama Large Millimeter Array, located in Chile, scientists were able to study ID2299 in detail. As the images revealed, the merger that formed ID2299 sent large amounts of star-forming gas into the intergalactic medium. ...
Six galaxies found trapped in ‘spider’s web’ of supermassive black hole

Six galaxies found trapped in ‘spider’s web’ of supermassive black hole

Technology
Astronomers have found six galaxies lying around a supermassive black hole in a cosmic "spider's web" of gas extending to more than 300 times the size of the Milky Way.Researchers say it was formed when the universe was less than a billion years old and this is the first time such a close grouping has been seen so soon after the Big Bang. The finding helps to better understand how supermassive black holes, one of which exists at the centre of our Milky Way, formed and grew to their enormous sizes so quickly.It also supports the theory that black holes can grow rapidly within large, web-like structures, which contain plenty of gas to fuel them, according to the astronomers. Image: Another black hole found by the European Southern Observatory. Pic...
Citizen scientists enlisted to chart galaxies

Citizen scientists enlisted to chart galaxies

Science
March 13 (UPI) -- A study of spiral structure, reduced in complexity so citizen scientists can participate, could offer insight into how galaxies evolve, researchers say. Researchers at the North Carolina Museum on Natural Sciences in Raleigh used software and tracings of known spiral galaxies on paper, and found that no artificial intelligence program, algorithm or other approach was as accurate in depicting the winding-arm design of galaxies. The work, called Spiral Graph, has been described in a paper published in Monthly Notices of the Royal Astronomical Society, and is available to citizen scientists at Zooniverse.org for no charge. "These human-generated tracings give our software a boost so it can accurately measure how tightly wrapped the structure [of the galaxy] is," Patrick Tr...
Giant carbon clouds surround young galaxies

Giant carbon clouds surround young galaxies

Science
Dec. 16 (UPI) -- Old -- but newly analyzed -- data from the Atacama Large Millimeter/submillimeter Array in Chile suggest young, growing galaxies are enveloped in a massive cloud of carbon gas. Cosmological models have not previously predicted the presence of such clouds, but using ALMA observations, scientists successfully measured billows of gaseous carbon measuring 30,000 light-years across. "We examined the ALMA Science Archive thoroughly and collected all the data that contain radio signals from carbon ions in galaxies in the early universe, only one billion years after the Big Bang," Seiji Fujimoto, an astronomer at the University of Copenhagen, said in a news release. "By combining all the data, we achieved unprecedented sensitivity. To obtain a data set of the same quality with o...
Supercomputer simulation reveals how galaxies evolve

Supercomputer simulation reveals how galaxies evolve

Technology
A new simulation from a NASA supercomputer has revealed how galaxies evolve by eating the gas spread through space around them.When stars reach the end of their life cycle they can explode as a supernova, blowing gas formed of elements made inside the star back into space. This gas and dust collects into enormous clouds which can eventually collapse, leading to anywhere between dozens to tens of thousands of stars forming almost simultaneously. Image: A supercomputer simulation reveals how galaxies eat stars. Pic: NASA Without showing the light from the stars themselves, the NASA simulation depicts gases moving in and out of an evolving galaxy over 13 billion years.It shows gases in a range of colours, from purple to yellow, to indica...