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Black hole at the center of our galaxy appears to be getting hungry



 Black hole at the center of our galaxy appears to be getting hungry
rendering of a star called S0-2 orbiting the supermassive black hole at the center of the Milky Way. It did not fall in, but its close approach could have been one reason for the black hole's growing appetite. Credit: Artist's rendering by Nicolle Fuller / National Science Foundation
            

The huge black hole at the center of our galaxy has an unusually large meal of interstellar gas and dust, and researchers do not understand why.
                                               

"The supermassive black hole has never been tested in the 24 years," said Andrea Ghez, UCLA professor of physics and astronomy and co-senior author of the research.

A paper about the study, led by the UCLA Galactic Center Group, which publishes Ghez heads, is published today in Astrophysical Journal Letters .

The researchers analyzed more than 1

3,000 observations of the black hole from 133 nights since 2003. The images were gathered by the World Cup Keck Observatory in Hawaii and the European Southern Observatory's Very Large Telescope in Chile. The team found that on May 13, the area just outside the black hole's "point of no return."

They also observed large changes on two other nights this year; all three of those changes were "unprecedented," Ghez said.

The brightness of the skulls in the black hole;

"The big question is whether the black hole is entering a new phase-for example Mark Morris, UCLA's professor of physics and astronomy and the paper's, says Mark Morris, "UCLA professor of physics and astronomy and the paper's" co-senior author.


The evolution of galaxies

"We want to know how black holes grow and affect the evolution of galaxies." and the universe, "said Ghez, UCLA's Lauren B. Leichtman and Arthur E. Levine's Professor of Astrophysics.

The Sagittarius A *, or Sgr A * -during four nights in April and May at the Keck Observatory. The brightness in the sky is a little bit different, but the scientists said it was not. 13.

"The first image I saw that night, the black hole was so bright I initially mistook it for the star S0-2, because I had never seen Sagittarius A * that bright, "said UCLA research scientist Tuan Do, the study's lead author.

One hypothesis about the increased activity is that when it is called S0-2 made its closest approach to the black hole during the summer

G2, which is most likely a pair of binary stars, which makes its closest approach to the black hole in 2014. Ghez said, "What could possibly be better than the black hole?"

Morris said: "The other is the brightening of the demise of large hole."


No danger to Earth

The black hole is some 26,000 light-years away and no danger to our planet. Astrophysical Journal Letters

Ghez's research team reported July 25 in the journal Science's most comprehensive test of Einstein's iconic general theory of relativity near the world black hole. Their conclusions that Einstein's theory passed the test are now correct, at least for now, which is based on their study of S0-2 as a complete orbit around the black hole.

Ghez's team studies more than 3,000 stars that orbit the supermassive black hole. Since 2004, Ghez helped pioneer, called adaptive optics, which corrects the distorting effects of the Earth's atmosphere in real time. But speckle holography enabled the researchers to improve the data from the decade before adaptive optics came into play.

"It's like doing LASIK on our early images," Ghez said. "We did not anticipate that."
                                                                                                                        


Einstein's general relativity theory is questioned but still stands for now


More information:
Tuan Do et al. Unprecedented Near-Infrared Brightness and Variability of Sgr A *, The Astrophysical Journal (2019). DOI: 10.3847 / 2041-8213 / ab38c3

Zhuo Chen et al. Consistency of the Infrared Variability of SGR A * over 22 yr, The Astrophysical Journal (2019). DOI: 10.3847 / 2041-8213 / ab3c68

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University of California, Los Angeles




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                                                 Black hole at the center of our galaxy appears to be getting hungry (2019, september 11)
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