Why Galaxies Can Grow So Fast When the Universe Still "Babies"

Astronomy Science ~ Astronomers using NASA's space telescopes are in the middle of a survey designed to find out how galaxies in the yo...

Astronomy Science ~ Astronomers using NASA's space telescopes are in the middle of a survey designed to find out how galaxies in the young universe is growing so fast.

The first results of the project using the Spitzer Space Telescope, shows hundreds of large galaxies (100 times the mass of the Milky Way) that exist when the universe was still in its infancy.

This presents a dilemma for astronomers, which is difficult to explain how these giants formed so early in the history of the universe.

"If you consider our survey as fishing galaxy at sea cosmic, then we find more big fish in waters deeper than previously thought," said lead author Charles Steinhardt, of NASA's Infrared Processing and Analysis Center (IPAC) at the California Institute of Technology in Pasadena, said in a statement.

The project is dubbed SPLASH (abbreviation of Spitzer Large Area Survey with Hyper-Suprime-Cam). Researchers aim to use this telescope for 2,475 hours to see two dark areas in the sky away from the Milky Way star field.

Area of Spitzer telescope observed the sky called the COSMOS field, an abbreviation of the Cosmic Evolution Survey
Field examined previously called the Cosmic Evolution Survey (COSMOS) and field Subaru / XMM-Newton (SXDS). This field region each measuring eight full moon. Examination Spitzer in infrared wavelengths will help astronomers see the galaxy's mass.

Current star formation models state that early galaxies bumping into each other and when they join, they grow bigger and encourage the formation of stars. However, this process will not work fast enough (as far as astronomers understand), if following this model, Spitzer should see a large galaxy at a distance of between 800 million and 1.6 billion years after the universe was formed.

Perhaps the first galaxies formed earlier than scientists had expected. Although many astronomers believe the galaxy began to grow about 500 million years after the Big Bang that formed the universe, but the process of growth that began 400 million years after the Big Bang. But there are other theories as well.

"It is very difficult to establish something so big and so fast," said Josh Speagle, co-author of the study from Harvard University in Massachusetts, said in the same statement. "So it is very possible that these galaxies have been forming stars continuously since they were born."

Scientists will look more closely at this galaxy using Subaru telescope in Hawaii, which will perform a number of years of observation to follow up on what was found Spitzer.

A report based on a recent study appearing in Astrophysical Journal Letters.

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AstroNation: Why Galaxies Can Grow So Fast When the Universe Still "Babies"
Why Galaxies Can Grow So Fast When the Universe Still "Babies"
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