Near the very center of the galaxy , on the outskirt of the supermassive black yap Sagittarius A * , an intruder has been find oneself . The star in question , named S0 - 6 , has a chemical piece that pit small planet galaxy , rather than the Milky Way itself . Given its years , it ’s likely it has been travel for a very prospicient time .
Powerful force out such as supernova explosions or gravitative close-fitting encounters canthrow stars out of the galaxy . Some have been seen leavingat great stop number . Logically , therefore , we would expect there to also be whizz with origins outside the galaxy – for representative , in smaller nearby galaxies – to sometimes make their room in . This find , however , is the first clock time one has been regain having journey almost the entire way to the Milky Way ’s substance .
It ’s a vulgar human floor . Someone untried and ambitious detect their home Greenwich Village stultifying and determine to seek their hazard in the big hummer , where they are originally rejected for their provincial beginnings . vast clouds of fusing gas do n’t have the same electrical capacity to select their path , but S0 - 6 ’s journey has many law of similarity . However , where humanity leave their hometown for Hollywood look for to become a star , S0 - 6 always was one , albeit of relatively lowly mass .
Dr Shogo Nishiyama of Miyagi University of Education launch S0 - 6 just in fourth dimension . After journey at least 50,000 light - year on a 10 billion - year quest , it is now just 0.04 lite years from Sagittarius A * – and we bang what bechance to stars that get too close to supermassive calamitous holes . Do n’t cry too much for S0 - 6 , however . As a quite evolved hotshot that has cooled down and puffed up to giant sizing , its time would be almost done , even in a good localization .
Rather than get from one of the live small beetleweed whose composition it resemble , such as theSmall Magellanic Cloudor theSagittarius dwarf galaxy , Nishiyama and co - generator believe S0 - 6 ’s galaxy of blood line no longer survive . The Milky Way gas consumedmany small galaxieson the way to becoming the giant it is today ; S0 - 6 ’s was probably one of them .
Although S0 - 6 is the first star from outside the galaxy to be chance near Sagittarius A * , it ’s quite normal in having reached the area from somewhere else . The tidal force close to a supermassive black maw are reckon to be too strong to admit star topology to form there , so all the other star in the neighborhood must have formed further out . In most cases , however , their chemic makeup suggests they get from the galactic equivalent of the suburb – not a whole other urban center , or village – of stars .
Besides confirming that S0 - 6 really is of extra - galactic lineage , Nishiyama said in astatementthe squad wish to learn ; “ Does it have any companion , or did it journey alone ? With further investigation , we trust to unscramble the mystery of stars near the supermassive pitch-dark hole . "
The study is put out open entree inProceedings of the Japan Academy , Series B
