It took eight telescopes and more than 200 astronomers to produce an astonishing, never seen before image of a distant black hole.
Scientists at EHT successfully imaged the Event horizon of a supermassive black hole on April 10
They image a Black hole nearly 55Million light years away from Earth at the heart of Messier 87 galaxy
The Black hole image Released After 2 years of captured the black hole data.
The gravity exerted by a black hole is so powerful that light cannot even escape.
which obviously makes it impossible to take a picture of one. But black holes possess what’s called an event horizon: a boundary designating the point of no return.
Light and matter that cross this threshold will not escape the black hole, but spacetime is warped at the event horizon such that it creates a glowing circle of accreting matter.
It creates a sort of silhouette of the object that’s what the EHT captured.
How Scientists Captured The Black hole image
EHT is actually a project comprised of eight different telescopes at different observatories around the world operating in synchronicity to image the black holes in the center of M87 as well as the supermassive black hole at the center of our own Milky Way galaxy, Sagittarius A.
The Black hole picture comes from data captured over a span of nine days in April 2017.
It’s taken two years to actually unpack and analyze all of the observatories’ data, in part because the files are too massive to transfer digitally.
Hard drives had to be physically ferried from the observatories in order for scientists to process the data.
The Antarctic dataset, in particular, remained inaccessible for months because of extreme weather.
Totally scientists unpacked 5 petabytes of Balck hole data results the pretty amazing Black hole
In April 2017, the astronomers synchronized all the telescopes to take measurements of radio waves being emitted from the event horizon of the black hole, all at the same time. Synchronizing the telescopes was akin to creating an Earth-size telescope with an impressive resolution of 20 microarcseconds
In comparison, the black hole they imaged is about 42 microarcseconds across).
They then took all these raw measurements, analyzed them and combined them into the image that you see.
EHT has observed the black holes in just one frequency light with a wavelength of 1.3 millimeters. But the project soon plans to look at the 0.87-mm frequency as well, which should lead to additional 30% angular resolution improvement.
What Real Image of Black Hole represents
In the image, the dark circle represents the “shadow” of the black hole and its boundary, created by the glowing material that surrounds it. However, the colors of the bright ring in the image aren’t the actual hues of the gas; rather, they represent a color map chosen by EHT researchers to depict the brightness of the emissions, Fox explained.
“The yellow is the most intense emission, the red is less intense, and then black is little or no emission at all,”. In the optical range, the ring around the black hole would likely appear white, perhaps tinged with blue or red
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