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You are here: Home / Tech & Science / Displaced Black Hole or Massive Supernova: Astronomers Search for Answers

Displaced Black Hole or Massive Supernova: Astronomers Search for Answers

November 20, 2014 Posted by Contributor

displaced black hole

Astronomers discovered a black hole positioned far away from its host galaxy. Initially, they thought they are looking at a supernova, but a closer examination seems to indicate that a black hole has gone rogue. When galaxies collide, they form a larger galaxy. Black holes, usually located at the core of each galaxy, will merge as well.

But scientists have been searching for proof that some black holes do not merge, because already created gravitational waves interfere with the process. The powerful gravitational waves manage to push one black hole out, according to the theory. Researchers will gather more data to confirm or refute the hypothesis.

Either way, the finding is exciting, because if the telescopes see a supernova, it will turn out to be a very uncommon specimen. Usually, supernovas shine this bright for about one year. After a huge explosion, they gradually dim. SDSS1133, the bright spot lying at the margins of Markarian 177 galaxy, was observed for more than 60 years at an abnormally high luminosity.

Markarian 177 is a dwarf galaxy located 90 million light years away from Earth. Milky Way galaxy is 100 times larger than Markarian 177. SDSS1133, the alleged black hole, seems to be 2,600 light years away from the center of its galaxy.

“With the data we have in hand, we can’t yet distinguish between these two scenarios,” Michael Koss said, now an astronomer at ETH Zurich, the Swiss Federal Institute of Technology. “But, one exciting discovery made with NASA’s Swift is that the emission of ultraviolet light of SDSS1133 hasn’t changed for a decade, which is not something typically seen in a young supernova remnant.”

Evicted black holes continue to shine until they consume all the gas that travelled along with them. It seems that this is the case here, although the spot has been getting brighter in the last half a year.

A third explanation would be that SDSS1133 is a luminous blue variable (LBV), a type of massive stars which go through longer eruption periods. In the end, they reach the supernova stage. If that is the case, we are witnessing an extreme case of LBV.

Anyway, for those who can’t really appreciate how far away from Earth these processes are taking place, Koss says that SDSS1133 moves really slowly, at just 100 km per second, so it will not approach our galaxy anytime soon.

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Filed Under: Tech & Science Tagged With: dwarf galaxies, keck observatory, Markarian 177, supermassive black hole

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