Feeding of Teenage Galaxies

New observations which was made by using ESO’s Very Large Telescope will help to better understand the growth of teenage galaxies.In the biggest survey of its kind astronomers have found that galaxies changed their eating habits during their teenage years the period from about 3 to 5 billion years after the Big Bang.  At the start of this phase smooth gas flow was the preferred snack, but later, galaxies mostly grew by cannibalising other smaller galaxies. Galaxies examined through the VLT are located in a tiny patch of sky more than 40 million light-years away, in the constellation of Cetus. Astronomers have known that the earliest galaxies in the universe were much smaller than the spiral and elliptical galaxies that now fill the cosmos, but how these galaxies bulked up over time was largely a mystery. The new survey offered novel details about the eating habits of teenage galaxies to help scientists grasp how galaxies gro. As reported ESO the results of the new study suggest that many galaxies went through a period of growing pains when the universe was 3 billion to 5 billion years old. Smooth flows of gas seem to have dominated the growth of galaxies in the very young universe, while galaxy mergers came more into play later. Since the galaxies in the survey are so distant, they appear only as small, faint specks in the sky, but the data collected by the researchers helped them make maps of how different parts of the galaxies are moving and what they are made of. For researchers 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. The findings also allowed the astronomers to compare the ingredients of these teenage galaxies to the more massive spiral and elliptical galaxies that now populate the universe. For more and detail observations researchers plan to continue their study.
source:www.space.com