The black hole at the center of our galaxy is warping and also combining stars into a strange new kind the object, astronomers say.
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This illustration reflects the six strange objects (dubbed G1 with G6) that astronomers detected swirling approximately our galaxy"s main black hole. The mysterious blobs orbit the feet every 100 to 1,000 years, stretching out together they approach.(Image credit: Anna Ciurlo, Tuan Do/UCLA Galactic center Group)
Like most large galaxies, the Milky way is glued with each other by a supermassive black color hole at its center, hidden deep in the constellation Sagittarius. Our galaxy"s supermassive black hole, referred to as Sagittarius A* (or Sgr A*), constantly traction stars, dust and also other matter inward, developing a mainly megalopolis 1 billion times denser than our edge of the galaxy.
Sometimes, stars closest come the black color hole have actually to compete for space — and also sometimes, a brand-new study suggests, this competition becomes a strange and violent marriage.
In the new study, published today (Jan. 15) in the newspaper Nature, astronomers define six mysterious objects swirling roughly our galaxy"s central black hole. According to the authors, these anomalous objects (dubbed G1 v G6) look choose oblong blobs that gas numerous times more massive than Earth. However, they behave like little stars capable of passing perilously close come the black color hole’s sheet without gift ripped to shreds.
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Are this peculiar an are burps simply gas, or are they stars? follow to the research authors, the blobs may be a strange hybrid of both. Based upon the 6 objects" shapes, orbits and also interactions through Sgr A*, the researchers indicate that every G object is a pair the binary stars (two stars that revolve about each other) that acquired smashed with each other by the black color hole"s gravity countless years back and is tho spilling out clouds the gas and also dust in the messy consequences of the collision.
"Black holes might be steering binary stars come merge," study co-author Andrea Ghez, a professor the astrophysics at the college of California, Los Angeles, claimed in a statement. "It"s possible that many of the stars we"ve been watching and not knowledge may be the end product that
Wanderers the the void
The first two G objects were found in 2005 and also 2012, respectively. Due to the fact that the two objects followed a strikingly similar orbit about Sgr A*, part astronomers taken them together wisps the gas ripped far from an unfortunately dead star, or as clumped-up "knots" in a consistent ring that gas swirling around the hole.
The first big clue that something else to be going on came in 2014, when the blob called G2 came within a few hundred astronomical units (a few hundred time the median distance in between Earth and also the sun) the the black hole"s occasion horizon. Astronomers guess that, if G2 was just a cloud the gas, it would certainly be take it to shreds through the extreme gravity. Yet the blob endured — albeit a little misshapen.
"At the time of the next approach, G2 had actually a yes, really strange signature," Ghez said. "It went from gift a quite innocuous object once it was far from the black hole to one the was really stretched out and distorted in ~ its the next approach."
In the year after the encounter, G2 became more compact again. All of this argued that something gravitationally an effective is stop the blob together — definition it is most likely a star of some sort, the writer wrote.
New blobs on the block
To check this hypothesis, the research authors spent numerous years scouring the galaxy"s center from the W.M. Keck Observatory in Hawaii, searching for much more potential G-type objects. The team established four new blobs that fit the bill, each one adhering to a wildly different orbital path approximately Sgr A* but showing similar characteristics as G1 and G2. The brand-new objects look choose compact clouds of gas many of the time, the researchers said, however when your orbits (which variety from 100 to 1,000 years) carry them closest come the black color hole, they become warped and also elongated, just as G2 did.
Because every object follows a distinct orbit, the theory that all of these blobs space knots that gas speak a single wheel that matter roughly the hole doesn"t hold up. The likeliest explanation, the authors wrote, is the the G blobs room the commodities of binary stars that obtained smooshed together by the black hole"s heaviness — one explosive mergers that have the right to stain the sky with gas and also infrared radiation.
The number of observed G-type objects fits through the expected percent of binary stars in the main hub the the galaxy, the writer wrote. Further, because stars take around 1 million years to merge, the objects might well have actually been born throughout the last well-known star formation occasion near Sgr A*, which take it place about 5 million years ago.
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While the explanation appears to fit, researchers can"t be details until lock locate and also study more binary stars the seem to have been thrown together by a black color hole. It could not take an additional eight year to uncover them — the research authors said they currently have a couple of nearby candidates in mind, which castle will continue to observe.