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Six "Dark Galaxy" candidates with little to no stars discovered



Astronomers have discovered up to six dark galaxy candidates, bizarre galaxies that seem to be just 12 billion light-years away from stars.

Although galaxies should be occupied with stellar bodies, the dark galaxies are a rare exception. They are inefficient in the formation of glowing stars and are filled with a large amount of matter and gas that emit too little light for modern telescopes to catch, reports ScienceAlert.

Some think these systems formed an integral part of galactic formation, with many theoretical models suggesting that they would exist in the early days of our universe when star formation was not as common and simple as later.

However, not much data has been collected to explore these galaxies for their formation and evolution. The reason for this is the lack of sufficiently visible light that makes it extremely difficult for astronomers to spot a dark galaxy.

For this reason, the recent discovery of physicists at ETH Zurich is important. The report found that the team found the weak galaxies by using the abilities of quasars, distant objects driven by supermassive black holes that are a billion times larger than our sun. [1

94559005] <img itemprop = "contentUrl" width = "3918" height = "2052" class = "mapping-embed" src = "http://s1.ibtimes.com/sites/www.ibtimes.com/files/styles/embed/public/2018/05/28 /hubbles-barred-booming-spiral-galaxy.jpg "alt =" Hubble's bared and booming spiral galaxy [19659007] Astronomers observe six dark galaxies with none to small stars, pictured in the Hubble's Wide Field Camera 3 (WFC3) Photo taken by NASA / ESA Space Telescope showing a barred spiral galaxy called UGC 6093. Photo: ESA / Hubble & NASA

Quasars make some of the brightest objects in our universe and They shine so bright that they step into the shadows and contain them, but the light these objects emit is not the result of the black hole, but the friction in it the accretion disk of gas and surrounding stars.

The intense ultraviolet light of a quasar fluoresces near the hydrogen atoms of the Lyman alpha line. In this way, it acts as a flashlight and allows astronomers to see if a dark, hydrogen-filled galaxy sits in the immediate vicinity of the quasar.

"The signal from any dark galaxies near the quasar is a thrust that makes them visible," says Sci-News.

Six years ago, astronomers discovered a handful of dark galaxies using this technique with the Very Large Telescope of the European Southern Observatory. In 2014, however, the telescope was expanded to include the Multi-Unit Spectroscopic Explorer or the MUSE instrument, which allowed one to look close to quasars that were far removed from those of 2012 and found six galaxies.

observed each of the six quasifields for ten hours. The observation helped them to distinguish the potential dark galaxy candidates from about 200 Lyman Alpha sources and classify them as normal star formation systems. Once the galaxies were identified, they received spectral information for each of them.

The study "Dark Galaxy Candidates at Redshift ~ 3.5 Discovered with MUSE" was published in the Astrophysical Journal on May 23rd.


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