Black Hole Spy 2022
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Black Hole Spy 2022
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New black hole sonifications with a remix are now available for listening (2022, May 4)
retrieved 14 October 2022
from https://phys.org/news/2022-05-black-hole-sonifications-remix.html
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Since 2003, the black hole at the center of the Perseus galaxy cluster has been associated with sound. This is because astronomers discovered that pressure waves sent out by the black hole caused ripples in the cluster's hot gas that could be translated into a note—one that humans cannot hear, some 57 octaves below middle C. Now a new sonification brings more notes to this black hole sound machine. This new sonification—that is, the translation of astronomical data into sound—is being released for NASA's Black Hole Week this year.
In some ways, this sonification is unlike any other done before because it revisits the actual sound waves discovered in data from NASA's Chandra X-ray Observatory. The popular misconception that there is no sound in space originates with the fact that most of space is essentially a vacuum, providing no medium for sound waves to propagate through. A galaxy cluster, on the other hand, has copious amounts of gas that envelop the hundreds or even thousands of galaxies within it, providing a medium for the sound waves to travel.
In this new sonification of Perseus, the sound waves astronomers previously identified were extracted and made audible for the first time. The sound waves were extracted in radial directions, that is, outwards from the center. The signals were then resynthesized into the range of human hearing by scaling them upward by 57 and 58 octaves above their true pitch. Another way to put this is that they are being heard 144 quadrillion and 288 quadrillion times higher than their original frequency. (A quadrillion is 1,000,000,000,000,000.) The radar-like scan around the image allows you to hear waves emitted in different directions. In the visual image of these data, blue and purple both show X-ray data captured by Chandra.
In addition to the Perseus galaxy cluster, a new sonification of another famous black hole is being released. Studied by scientists for decades, the black hole in Messier 87 (M87) gained celebrity status in science after the first release from the Event Horizon Telescope (EHT) project in 2019. This new sonification does not feature the EHT data, but rather looks at data from other telescopes that observed M87 on much wider scales at roughly the same time. The image in visual form contains three panels that are, from top to bottom, X-rays from Chandra, optical light from NASA's Hubble Space Telescope, and radio waves from the Atacama Large Millimeter Array in Chile. The brightest region on the left of the image is where the black hole is found, and the structure to the upper right is a jet produced by the black hole. The jet is produced by material falling onto the black hole. The sonification scans across the three-tiered image from left to right, with each wavelength mapped to a different range of audible tones. Radio waves are mapped to the lowest tones, optical data to medium tones, and X-rays detected by Chandra to the highest tones. The brightest part of the image corresponds to the loudest portion of the sonification , which is where astronomers find the 6.5-billion solar mass black hole that EHT imaged.
These sonifications were led by the Chandra X-ray Center (CXC) and included as part of NASA's Universe of Learning (UoL) program with additional support from NASA's Hubble Space Telescope/Goddard Space Flight Center. The collaboration was driven by visualization scientist Kimberly Arcand (CXC), astrophysicist Matt Russo, and musician Andrew Santaguida (both of the SYSTEMS Sound project). NASA's Marshall Space Flight Center manages the Chandra program. The Smithsonian Astrophysical Observatory's Chandra X-ray Center controls science from Cambridge Massachusetts and flight operations from Burlington, Massachusetts.
For more Chandra images, multimedia and related materials, visit www.nasa.gov/chandra
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FLYING high over the North Sea, a mysterious "black triangle" shape flanked by two US fighter jets was spotted by an oil rig worker.
The sighting came as there was a flurry of reports of unusual aircraft, unexplained sonic booms, ear-splitting high-pitched shrieks and fast-moving radar dots around Britain.
For years during the late 80s and early 90s the British Isles seems to have been menaced by these shapes and sounds , with the reports often being branded as UFOs.
It is believed however some of the reports may have been glimpses of a long rumoured 5,000mph hypersonic US spy plane known as the "Aurora".
And in a stroke of extraordinary luck, one of the most compelling accounts of the "black triangle" sightings came from highly trained aircraft spotter Chris Gibson.
He was working on the oil rig Galveston Key in August 1989 and was a trained member of the Royal Observer Corps (ROC), a civil defense unit set up to track and report aircraft over Britain.
And when his pal called him out onto the deck to look up into the sky, he witnessed the mysterious aircraft - something he had never seen before and has never seen again.
"I had no idea what this thing was," Gibson told The Sun Online, speaking to us almost exactly 32 years to the day of his sighting over the North Sea around 60 miles off the coast of Norfolk.
"The guy I was working with went out on deck - probably to have a cup of tea or something - and he came straight back in and says 'Chris, come and have a look at this'."
"We went outside and he pointed up, I looked up - and he said 'what's going on there?'."
"And I said, 'well the big one is a KC-135, the two little ones to the side are F-111s and I don't know what the one behind is'."
Chris's mate then turned to him and joked, "I thought you were an expect? Pffft, some expert".
But despite his extensive training and more than a decade of experience with the ROC, the engineer simpl
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