As astronomers observed the black hole in near infrared, which is the most effective way to see variability in it, they spotted some 'unprecedented' changes. Some of them have been observing the black hole for years. They've never seen anything like this.
Astronomers never know exactly to expect when they point a telescope in a specific direction -- and sometimes what they see is completely unexpected.
In this case, astronomers were using the European Southern Observatory's Very Large Telescope in Chile and the W. M. Keck Observatory in Hawaii to observe the supermassive black hole at the center of our galaxy. It's 26,000 light-years from Earth, but it's the closest black hole we can see, even if it's largely obscured by dust.They observed it over four nights in April and May. This black hole, known as Sgr A*, has shown variability before.
— Tuan Do August 11, 2019 The data differs from past observations of the black hole that have been collected in other studies. So, what happened? That's the big mystery and the astronomers don't know the answer. In the study, they suggest that the statistical models for the black hole and its variability need to be updated to track these changes in luminosity. Taken when I was @keckobservatory, this raw image shows the brightest Sgr A* has ever been observed in the infrared .
— Tuan Do August 8, 2019 "The 2019 measurements push the limits of the current statistical models," the authors wrote in the study.Another option is that there was a physical change in the black hole's activity. Is this because of an increase in its gathering of material? The astronomers said that more data, especially over multiple wavelengths of light, through the rest of the year and in the future could provide more answers.
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