'Unlike any objects we know': Scientists get their best-ever view of 'space tornadoes' howling at the Milky Way's center
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"Space tornadoes" are swirling near the supermassive black hole at the heart of our Milky Way galaxy, new telescope observations have revealed in unprecedented detail.
Astronomers recently zoomed in on the cosmic twisters using the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile. Although these rotating structures had been seen previously, the new observations with ALMA are 100 times sharper than the earlier views, the team reported in a new paper published in the journal Astronomy & Astrophysics.
The researchers began by pointing ALMA at a region of the galaxy known as the central molecular zone (CMZ), which surrounds our galaxy's core supermassive black hole and is filled with seething clouds of dust and gas. The team wanted to uncover the mechanism driving the relentless motion of these clouds.
Related: High-school student accidentally discovers black hole 'light echo' twice as wide as the Milky Way
They used ALMA to trace certain molecular compounds — such as silicon monoxide, which is particularly good at revealing shock waves — within the maelstrom. This allowed the team to detect previously unseen details in the cosmic dust storms — including a new type of long, slender filament that seems to form when shock waves ripple past.
"Unlike any objects we know, these filaments really surprised us," because they appear to move quickly and in a direction counter to the structures surrounding them, Kai Yang, an astronomer at Shanghai Jiao Tong University and lead author of the study, said in a statement.
The researchers describe these filaments as space tornadoes. "They are violent streams of gas, they dissipate quickly, and they distribute materials into the environment efficiently," the authors said in the statement. The team's observations suggest that, in addition to emitting silicon oxide, these whirlwinds might disperse complex organic molecules — such as methanol, methyl cyanide and cyanoacetylene — throughout the CMZ and beyond.
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"ALMA's high angular resolution and extraordinary sensitivity were essential to detect these molecular line emission associated with the slim filaments, and to confirm that there is no associations between these structures with dust emissions," Yichen Zhang, an astrophysicist at Shanghai Jiao Tong University and a co-author of the paper, said in a statement.
Further observations with ALMA will help the researchers determine how widespread these slim filaments are within the CMZ and how they contribute to molecular cycling in the region.
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It was Pat who encouraged Fred to find a place with dark skies for a retirement home, so he bought property at Arizona Sky Village in Portal and spent most of his free time under the starry skies visible from his Bifrost Astronomical Observatory. On a personal note, I first met Fred about 50 years ago at a function that was held at the Wagner College Planetarium in Staten Island, where he served as a volunteer. At the time, I was doing something similar at the Hall of Science Planetarium in Flushing, N.Y. But it wasn't until years later, when Fred began, in earnest, to publish and circulate his eclipse bulletins, that I became aware of his expertise in eclipse calculations. I owe him so much for helping me in my own attempts to educate the public about the phenomena of eclipses. My greatest regret is that we never had the opportunity to spend time together in the moon's umbra. I'm sure it would have been a blast! I wish you Godspeed my friend. I know you have taken a safe voyage and I hope to see you again someday. Joe Rao serves as an instructor and guest lecturer at New York's Hayden Planetarium. He writes about astronomy for Natural History magazine, Sky and Telescope and other publications.
