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Milky Way's fate? Astronomers reveal what ignites quasars

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Daniel Lawler, Agence France-Presse

<div class="embed-wrap"><figure data-feedback="fb:likes,fb:comments"><img alt="This artist" s="" concept="" shows="" the="" brilliant="" glare="" of="" two="" quasars="" residing="" in="" cores="" galaxies="" that="" are="" chaotic="" process="" merging.="" The="" gravitational="" tug-of-war="" between="" ignites="" a="" firestorm="" star="" birth.="" Quasars="" beacons="" intense="" light="" from="" centers="" distant="" galaxies.="" They="" powered="" by="" supermassive="" black="" holes="" voraciously="" feeding="" on="" infalling="" matter.="" This="" frenzy="" unleashes="" torrent="" radiation="" can="" outshine="" collective="" billions="" stars="" host="" galaxy.="" few="" tens="" millions="" and="" their="" will="" so="" quasar="" forming="" an="" even="" more="" massive="" hole.="" Credits:="" Joseph="" Olmsted="" src="https://sa.kapamilya.com/absnews/abscbnnews/media/2023/overseas/04/27/quasars.jpg"/><figcaption>This artist&#x27;s concept shows the brilliant glare of two quasars residing in the cores of two galaxies that are in the chaotic process of merging. The gravitational tug-of-war between the two galaxies ignites a firestorm of star birth. Quasars are brilliant beacons of intense light from the centers of distant galaxies. They are powered by supermassive black holes voraciously feeding on infalling matter. This feeding frenzy unleashes a torrent of radiation that can outshine the collective light of billions of stars in the host galaxy. In a few tens of millions of years, the black holes and their galaxies will merge, and so will the quasar pair, forming an even more massive black hole. Credits: NASA, ESA, Joseph Olmsted (STScI)</figcaption></figure></div>PARIS, France - Astronomers said Wednesday that for the first time they have confirmed what ignites quasars, the brightest and most powerful objects in the universe, which put galaxies in their &quot;death throes&quot;.These celestial behemoths form when two galaxies smash into each other, the astronomers said, warning that this could be the Milky Way&#x27;s fate in a few billion years.Quasars are one of the most extreme objects in the universe, some shining with the brightness of a trillion stars despite being packed into the space of our Solar System.They sit in the heart of galaxies, powered by supermassive black holes, requiring a huge amount of gas to be so staggeringly bright.But exactly what creates quasars has been a matter of debate since their discovery in the 1950s.<ul class="op-related-articles">	<li><a href="https://news.abs-cbn.com/spotlight/10/05/20/at-the-edge-of-time-a-litter-of-galactic-puppies">At the edge of time, a litter of galactic puppies</a></li>	<li><a href="https://news.abs-cbn.com/overseas/06/13/22/milky-ways-secrets-revealed-by-massive-space-probe-map">Milky Way&#x27;s secrets revealed by massive space probe map</a></li></ul>In a new study, an international team of researchers said they have &quot;clear evidence&quot; that quasars are triggered by two galaxies colliding, which releases the vast amounts of energy needed.Clive Tadhunter, an astrophysicist at the University of Sheffield in the UK and one of the study&#x27;s authors, told AFP that this could be the fate of the Milky Way one day.The nearby Andromeda Galaxy is &quot;coming directly towards us at about 200 kilometres (125 miles) a second,&quot; he said.It will collide with the Milky War in roughly five billion years, and &quot;we could get a quasar&quot; as a result, he said.Quasars push out all the gas from a galaxy, preventing any new stars from forming, he added.<div>&#x27;Beacons to the distant universe&#x27; </div>The researchers compared observations of 48 galaxies with quasars at their centre to 100 without them.Galaxies hosting quasars were three times as likely to have had collisions with other galaxies, the study said.While the theory that such collisions ignited quasars has been around for decades, it was difficult to prove.Tadhunter said this was because observations had often been carried out with telescopes that were optimised to look at objects in the centre of galaxies, but were less effective at spotting the distorted features at their edges that indicate past collisions.For example, these diffuse structures &quot;get washed out&quot; when observed by the Hubble Space Telescope, he said.So the team used land-based observatories, such as the Isaac Newton Telescope on the Spanish island of La Palma.The new study, published in the Monthly Notices of the Royal Astronomical Society, also reviewed previous research to show how it may have missed the tell-tale signs of collisions.Tadhunter said that quasars &quot;act like beacons to the distant universe&quot; because of their incredible brightness.The James Webb Space Telescope, which has a much bigger aperture than Hubble, could help reveal more about quasars in this distant universe, when the universe was in its infancy, he said.<div>dl/fb</div><div>© Agence France-Presse</div>

Astronomers said Wednesday that for the first time they have confirmed what ignites quasars, the brightest and most powerful objects in the universe, which put galaxies in their 'death throes'.

Milky Way's fate? Astronomers reveal what ignites quasars

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Milky Way's fate? Astronomers reveal what ignites quasars

Daniel Lawler,

Agence France-Presse

Published Apr 27, 2023 07:01 AM PHT

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