How teenage galaxies feed themselvesMar 15, 7:05 pm
Washington, Mar 15 (ANI): Astronomers have known for quite some time that the earliest galaxies were considerably smaller than the impressive spiral and elliptical galaxies that now fill the Universe. Over the lifetime of the cosmos galaxies have put on a great deal of weight but their food, and eating habits , are still mysterious. A new survey of carefully selected galaxies has focussed on their teenage years - roughly the period from about 3 to 5 billion years after the Big Bang.By employing the state-of-the-art instruments on ESO's Very Large Telescope an international team is unravelling what really happened. In more than one hundred hours of observations the team has collected the biggest ever set of detailed observations of gas-rich galaxies at this early stage of their development."Two different ways of growing galaxies are competing: violent merging events when larger galaxies eat smaller ones, or a smoother and continuous flow of gas onto galaxies. Both can lead to lots of new stars being created," explained Thierry Contini (IRAP, Toulouse, France), who leads the work.The new results point toward a big change in the cosmic evolution of galaxies, when the Universe was between 3 and 5 billion years old. Smooth gas flow (eso1040) seems to have been a big factor in the building of galaxies in the very young Universe, whereas mergers became more important later."To understand how galaxies grew and evolved we need to look at them in the greatest possible detail. The SINFONI instrument on ESO's VLT is one of the most powerful tools in the world to dissect young and distant galaxies. It plays the same role that a microscope does for a biologist," said Thierry Contini.Distant galaxies like the ones in the survey are just tiny faint blobs in the sky, but the high image quality from the VLT used with the SINFONI instrument means that the astronomers can make maps of how different parts of the galaxies are moving and what they are made of. There were some surprises."For me, the biggest surprise was the discovery of many galaxies with no rotation of their gas. Such galaxies are not observed in the nearby Universe. None of the current theories predict these objects," said Benoit Epinat, another member of the team."We also didn't expect that so many of the young galaxies in the survey would have heavier elements concentrated in their outer parts - this is the exact opposite of what we see in galaxies today," added Contini. (ANI)
Hidden galaxies discovered in our backyard Feb 10, 8:24 am
Washington D.C, Feb 10 (ANI): A galactic hide and seek game has come to an end with a team of astronomers discovering hundreds of hidden galaxies behind our own galaxy, the Milky Way.Full Story »
Planets similar to earth have identical interiors Feb 9, 10:18 am
Washington D.C., Feb. 9(ANI): A new research has suggested that like earth other rocky planets also have a thin outer crust, a thick mantle and a Mars-sized core.Full Story »
The magic trick of Saturn's rings Feb 8, 3:33 pm
London, Feb 8 (ANI): According to a recent study, Saturn's rings have been playing tricks on us by creating an optical illusion.Full Story »
`Cannibalism` between stars Feb 6, 4:12 pm
Washington D.C, Feb 6 (ANI): Unveiling the turbulent past of our sun, a team of researchers has shown 'cannibalism' between stars.Full Story »
- Antarctic fungi survive Martian conditions
- Monstrous cloud boomeranging back to Milky Way
- Head-on collision with forming planet tugged the Moon out of Earth
- Volunteer programmers help find mysterious black holes
- Lasagne-like dark `noodle` spotted in Milky Way
- Ninth planet lurking at edge of solar system?
- NASA: First flower ever in outer space blooms
- Universe's most luminous galaxy is 'ripping' itself!
- Mystery in Milkyway: Brightest explosion ever seen!
- Astronomers discover most luminous supernova ever
TOP VIDEO STORIES