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Black hole: First photo of the Milky Way monster

This is a huge black hole in the center of our galaxy, first painted.

Known as Sagittarius A *, this object weighs four million times as much as the Sun.

What you see is a central dark area with holes, surrounded by light coming from superheated gas accelerated by huge gravity.

In terms of scale, the ring is approximately the size of Mercury’s orbit around our star.

That’s about 60 million kilometers or 40 million miles in total.

Fortunately, this monster is far away, about 26,000 light-years away. Therefore, we are not at risk.

This image was created by an international team called the Event Horizon Telescope (EHT) collaboration.

This is the second such image after publishing a photo of a huge black hole in the center of another galaxy called Messier 87 or M87 in 2019. The object was 6.5 billion times the mass of our Sun and more than 1000 times larger.

“But this new image is special because it’s our supermassive black hole,” said Professor Heino Falcke, one of the European pioneers behind the EHT project.

“This is in’Our Backyard’. If you want to understand black holes and how they work, you’ll know this because we look at it intricately and in detail,” said Nijmegen Radbaud University. German and Dutch scientists told the BBC. news.

The photo is the Technical Tour Deforce. Must be so.

Sagittarius A *, or Sgr A * for short, at a distance of 26,000 light-years from Earth, is a small pin stab in the sky. Identifying such a target requires an incredible solution.

The EHT trick is a technique called Very Long Baseline Interferometry (VLBI).

Basically, it combines a network of eight wide-spaced radio antennas to mimic our planet-sized telescope.

This arrangement allows the EHT to cut the angle of the sky measured in microseconds. Members of the EHT team talk about the same sharp eyesight that you can see bagels on the surface of the moon.

Still, building an image from the few petabytes collected (1 PB is equivalent to 1 million gigabytes) requires an atomic clock, smart algorithms, and countless supercomputing times.

The way a black hole bends, the light of a lens, means that there is nothing else to see other than a “shadow”, but the brilliance of matter that screams around this darkness and spreads in a circle known as the accretion disk is what the object is. I betray where it is.

If you compare the new image with the previous M87 image, you may be wondering what’s different. But there are important differences.

“Sagittarius A * is a much smaller black hole, about 1/1000, so its ring structure changes on a timescale 1000 times faster,” said Dr. Ziri Younsi, a team member at the University College London, UK. Explained. “It’s very dynamic. The” hotspots “seen in the ring move around every day. “

This is very obvious from the simulations created by the team if we can take ourselves to the center of our galaxy and see the scene with radio frequency sensitive eyes.

The overheated excitation gas (or plasma) in the ring travels around the black hole at a significant portion of the speed of light (300,000 km / s, or about 190,000 miles per second). The brighter areas could be where matter is moving towards us and as a result its luminescence is energized or “Doppler boosted”.

These abrupt changes near Sagittarius A * are part of the reason why it took much longer to generate images than M87. Interpreting the data was a more difficult task.

Telescope observations of both black holes were actually taken during the same period in early 2017, but the M87 seems to be stationary in comparison due to its large size and distance of 55 million light-years. I can see.

Scientists are already beginning to deploy measurements on new images to test the physics they are currently using to explain black holes. So far, what they see is in perfect agreement with the equation Einstein set in the theory of gravity in general relativity.

We suspected that for decades there might be a supermassive black hole in the center of the galaxy. What else can create gravity that accelerates nearby stars through space at a speed of 24,000 km / s (for comparison our Sun is calm at 230 km / s, or 140 mph). Sliding around the galaxy)?

Interestingly, however, when the Nobel Prize in Physics awarded astronomers Reinhard Genzel and Andrea Ghez the Physics Prize in 2020 for Sgr A * research, the quote only talks about “supermassive compact objects.” I did. It was a crumpled room in case other exotic phenomena turned out to be explanations.

But now there is no doubt.

In August of this year, the new superspace telescope, James Webb, will turn to SgrA *. The $ 10 billion observatory does not have the resolution to directly image a black hole and its accretion ring, but it uses highly sensitive infrared equipment to bring new capabilities to the study of the environment around the black hole.

Astronomers will study the behavior and physics of hundreds of stars orbiting around black holes in unprecedented detail. They even look for evidence of star-sized black holes in the area, and a concentrated mass of invisible or dark matter.

“Every time we get a new facility that gives us a clearer picture of the universe, we will do our best to train it in the center of the galaxy and inevitably learn great things,” said Professor Jessica Lu of the University of California. Stated. The University of California, Berkeley, which leads the Webb campaign. — BBC

https://saudigazette.com.sa/article/620423/Life/Black-hole-First-picture-of-Milky-Way-monster?ref=rss&format=simple&link=link Black hole: First photo of the Milky Way monster

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