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Welsh astronomer who helped reveal the first image of a supermassive black hole in the center of the galaxy

Wales astronomers helped reveal the first image of a supermassive black hole in the center of our Milky Way galaxy.Dr. David James LlandudnoAnd his fellow international astronomers say that this result provides valuable clues about the work of such giants, where the object is actually a black hole and is believed to be in the center of most galaxies. It claims to provide overwhelming evidence. North wales live Report.

This image has long been awaiting a giant object in the center of our galaxy. Scientists have previously seen stars orbiting invisible, compact, and very large objects in the center of the Milky Way. This strongly suggests that this object, known as Sagittarius A * or Sagittarius A *, is a black hole, and today’s images provide the first direct visual evidence of it. ..

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The black hole itself is not visible, but because it is completely dark, the surrounding gas is shining, revealing the distinctive feature of a dark central area (called a “shadow”) surrounded by a bright ring-shaped structure. increase. The new view captures the light bent by the powerful gravity of a black hole, which has a mass four million times that of our Sun.

David added: “The black hole is about 27,000 light-years away from Earth, so it looks like the sky is about the same size as a lunar donut. To imagine that, the team created a powerful Event Horizon Telescope. It linked eight existing radio stations across the planet to form a single “Earth-sized” virtual telescope.

The team observed Sgr A * on multiple nights and collected data for hours in a row, much like using long exposures on a camera. This milestone follows the 2019 release of the Event Horizon Telescope collaboration, the first image of a black hole called M87 * in the heart of the farther Messier 87 galaxy.

David added: “The black hole imaging task for SgrA * was much more difficult than for M87 *, because the gas orbiting SgrA * completes the black hole orbit in just a few minutes.

“In effect, this means that the brightness and morphology of the black hole image changed very rapidly, even when making radio observations. Therefore, the final image is basically, Time is averaged throughout the observation night. Imagine trying to take a long exposure photo of an hour of waves crashing into the sand. That’s the blur effect we’re struggling with. “

The first image of a black hole in the center of our galaxy-Milky Way-includes the scale of the solar system for reference.

Nurturing North Wales

David was born in Germany, but grew up in Llandudno at an early age and then Colwyn Bay afterwards Abergere..

While at Pendollan Elementary School, he was fascinated by the night sky and loved to see the stars and the moon.

After telling her mother, Judith Pryor, who lives in a cottage overlooking the Conwy estuary, that she wants to pursue a career as a 7-year-old astrophysicist, she bought him a small telescope and an astronomy book and his passion. I grew up.

“Albert Einstein was right”

David said: “It’s great to think that the new image of the black hole in the center of the Milky Way is in line with the mathematical predictions of Einstein’s general theory of relativity, which he formulated over a century ago.

“The quantity and quality of radio telescope data is unmatched, and a team of international scientists from dozens of countries has analyzed and interpreted six petabytes (about 1.5 million movie DVDs) in the hundreds. I’ve spent the day creating imaging data, creating images, and validating the results with extensive computer simulation. “

After graduating from Alias ​​High School in 1988, David earned a Bachelor of Science degree in Astrophysics Physics from the University of London. He then went to the University of Birmingham, where in 1998 he received his PhD in optics and X-ray astronomy.

Since then, David has worked as a program manager, project scientist, astronomer, professor, and observatory director around the world.

He has manufactured telescopes and astronomical equipment in Greece, the Canary Islands, South Africa, Chile and Hawaii.

A single dad with four children has names that reflect his past-Benjamin, Charlotte, Tennessee, and Beaumaris. They all live in Gloucester, Massachusetts.

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Welsh astronomer who helped reveal the first image of a supermassive black hole in the center of the galaxy

Source link Welsh astronomer who helped reveal the first image of a supermassive black hole in the center of the galaxy

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