Astronomers Find Dusty Galaxies

Astronomy Science ~ One of the oldest galaxies ever observed has revealed that dust plays an important role in the future growth of the uni...

Astronomy Science ~ One of the oldest galaxies ever observed has revealed that dust plays an important role in the future growth of the universe. Dust grains are small building blocks of the cosmos.

Made of carbon, silicon, magnesium, iron and oxygen, they are formed in the nuclear burning star. They spewed out into space when stars die and explode. Over the aeons, clouds of dust and gas fused to form a new star system.

The theory is that when the universe was young, the gas must be formed early galaxy because there is no dust to do the job. But new research shows that dust plays a creative role at a point much earlier than expected.

Galaxy A1689-zD1
Galaxy A1689-zD1

Astronomers led by Darach Watson of the University of Copenhagen European telescope in the Atacama desert, to observe the galaxy, called A1689-ZD1.

Light from this galaxy when it reaches the Earth truly ancient. "Redshift" of this galaxy (benchmark time and distance) shows that this galaxy is about 13.1 billion light years or galaxy was formed about 700 million years after the "Big Bang." But traces of light also indicates that although this is very young galaxy, the galaxy has a complex rich dust.

"This is the first time the dust was found in one of the most distant galaxies ever observed," Watson said.

"It is a modest-sized galaxy, but already full of dust. It is very surprising and he tells us that normal galaxies are enriched with elements heavier much faster than expected." Redshift galaxies A1689-ZD1 is seven. Until now, the dust of the earliest galaxies ever observed to have a redshift of 3.2, which is equivalent to 12.5 billion years ago.

These findings indicate that consistently galaxies forming stars about 560 million years after the Big Bang, "which is a very short period of time in cosmology, given that most of the stars live for billions of years," said Watson.

Dim light of the galaxy that was captured thanks to a phenomenon called gravitational lensing. The light was enlarged to nine times while passing through the galaxy cluster Abel in 1689 on its way to Earth.

The findings are published in the journal of Nature.
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Astronomy Science: Astronomers Find Dusty Galaxies
Astronomers Find Dusty Galaxies
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