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A trace of galaxies at the heart of a gigantic galaxy cluster

Bringing some of the mysteries of the universe a little closer to home.

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Owlscrying
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Unread post Sun Aug 27, 2017 8:23 pm

Very large yet faint galaxies have been found where no one would have expected them – in the middle of a giant galaxy cluster. Heidelberg astronomers discovered the extremely-low density galaxies, known as ultra-diffuse galaxies, a find that is "both remarkable and puzzling", states Dr Thorsten Lisker. The research work was carried out by Carolin Wittmann in Dr Lisker's team at the Centre for Astronomy of Heidelberg University (ZAH). The results have been published in the Monthly Notices of the Royal Astronomical Society

Our solar system is located amid an enormous galaxy composed of billions of stars, the Milky Way. About 3,000 stars can be seen with the naked eye. However, if Earth were located in an ultra-diffuse galaxy, only a few dozen stars and a "trace" of a galaxy would be visible in the night sky. These special classes of galaxy, so named for their extremely diffuse appearance, apparently produced far fewer stars than other galaxies or else were stripped of them long ago by galactic tidal forces.

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Owlscrying
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Unread post Sun Aug 27, 2017 8:25 pm

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Credits: NASA's Goddard Space Flight Center/Stephen Walker et al.

This X-ray image of the hot gas in the Perseus galaxy cluster was made from 16 days of Chandra observations. Researchers then filtered the data in a way that brightened the contrast of edges in order to make subtle details more obvious. An oval highlights the location of an enormous wave found to be rolling through the gas.

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Owlscrying
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Unread post Sun Aug 27, 2017 8:26 pm



Combining data from NASA's Chandra X-ray Observatory with radio observations and computer simulations, scientists have found a vast wave of hot gas in the nearby Perseus galaxy cluster. Spanning some 200,000 light-years, the wave is about twice the size of our own Milky Way galaxy.

The researchers say the wave formed billions of years ago, after a small galaxy cluster grazed Perseus and caused its vast supply of gas to slosh around an enormous volume of space.

Galaxy clusters are the largest structures bound by gravity in the universe today. Some 11 million light-years across and located about 240 million light-years away, the Perseus galaxy cluster is named for its host constellation. Like all galaxy clusters, most of its observable matter takes the form of a pervasive gas averaging tens of millio ns of degrees, so hot it only glows in X-rays.

 
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CelticRose
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Unread post Mon Aug 28, 2017 11:16 am

Pretty post there owls! A neat find!
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