Rare birth of mega-galaxy captured by space telescope

Published: 24th May 2013 10:54 AM  |   Last Updated: 24th May 2013 10:54 AM   |  A+A-


Researchers in the US have captured rare images of the creation of a massive galaxy about 10 times the size of the Milky Way that was formed when two young galaxies collided 11 billion years ago, a study said.
"Capturing the creation of this type of large, short-lived star body is extremely rare - the equivalent of discovering a missing link between winged dinosaurs and early birds," scientists from the University of California, Irvine (UCI) who made the discovery said in a statement.
The new mega-galaxy was originally spotted by a post-doctoral researcher at UCI in an image recorded by the European Space Agency's Herschel telescope.
The researcher, Julie Wardlow, "noticed an amazing, bright blob" that stood out among the "carpets of galaxies" that Herschel recorded.
Follow-up studies by other telescopes, including NASA's Hubble and Spitzer space telescopes, confirmed that two galaxies, "located about 11 billion light-years from Earth, during a time when our universe was about three billion years old", were "intertwined and furiously making stars" at a rate of about 2,000 stars a year, NASA said in a statement.
The Milky Way only produces two to three new stars a year, NASA said.
Eventually, the two hyperactive galaxies will calm down and form a giant elliptical galaxy, according to astronomers.
"This monster system of interacting galaxies is the most efficient star-forming factory ever found in the universe at a time when it was only three billion years old," said Hai Fu, a postdoctoral researcher at UCI and lead author of the study published in the journal Nature.
The discovery of the space mega-merger helps to shed light on an astronomical mystery that scientists have pondered for years, namely how were large elliptical galaxies formed in the early universe.
Most large galaxies are either spirals that are full of gas, like the Milky Way, or ellipticals, populated by old cool red stars and showing few signs of ongoing star formation.
"It was long assumed that the large elliptical galaxies seen in the universe today built up gradually over time via the gravitational acquisition of many small dwarf galaxies," the European Space Agency said in a statement.
But the fact that the collision of the two galaxies happened when the universe was just three to four billion years old suggests that massive mergers in space could, in fact, be responsible for giant elliptical galaxies forming in such a "short" cosmological time frame as a few billion years.

Stay up to date on all the latest Tech news with The New Indian Express App. Download now


Disclaimer : We respect your thoughts and views! But we need to be judicious while moderating your comments. All the comments will be moderated by the editorial. Abstain from posting comments that are obscene, defamatory or inflammatory, and do not indulge in personal attacks. Try to avoid outside hyperlinks inside the comment. Help us delete comments that do not follow these guidelines.

The views expressed in comments published on are those of the comment writers alone. They do not represent the views or opinions of or its staff, nor do they represent the views or opinions of The New Indian Express Group, or any entity of, or affiliated with, The New Indian Express Group. reserves the right to take any or all comments down at any time.

flipboard facebook twitter whatsapp