Researchers track a cosmic whale to learn about galaxies’ magnetic fields

By Georgina Torbet December 1, 2019

NGC 4631 is seen edge-on, with its disk of stars shown in pink; the filaments, shown in green and blue, extend beyond the disk into the galaxy’s extended halo; green indicates filaments with their magnetic field pointing roughly toward us and blue with the field pointing away; this phenomenon, with the field alternating in direction, has never before been seen in the halo of a galaxy. This VLA image shows a companion galaxy — a small elliptical galaxy called NGC 4627 — just above NGC 4631. Jayanne English, University of Manitoba / Silvia Carolina Mora-Partiarroyo & Marita Krause of the Max-Planck Institute for Radioastronomy / Maria Patterson & Rene Walterbos, New Mexico State University / Arpad Miskolczi, University of Bochum / NRAO

Astronomers are looking to a cosmic whale to learn about the magnetic fields which surround galaxies. The image above of NCG 4631, also known as the “Whale Galaxy,” was captured by the Very Large Array in New Mexico, and shows filaments of the magnetic field in green and blue, snaking out from the main body of the galaxy.

Researchers know that galaxies are surrounded by halos: areas of hot gas and dark matter which extends beyond the visible part of the galaxy. These halos have magnetic fields running through them which affect the passage of cosmic rays and influence star formation. But we don’t know much about the structure of these fields. That’s why the new findings in the Whale Galaxy are so useful, as it has one of the largest halos we’ve found in a galaxy observed from edge-on.

“This is the first time that we have clearly detected what astronomers call large-scale, coherent, magnetic fields far in the halo of a spiral galaxy, with the field lines aligned in the same direction over distances of a thousand light-years,” Dr. Marita Krause, an astronomer with the Max-Planck Institute for Radioastronomy, said in a statement. “We even see a regular pattern of this organized field changing direction.”

To detect the magnetic field of the galaxy, the researchers used the antenna array to locate naturally emitted radio waves. By using different configurations of the array, they were able to detect both the larger structures of the galaxy as well as the finer details like the filaments.

These findings could help to explain more about the relationship between the formation of galaxies and their magnetic fields, as the researchers explained: “Building such a picture can answer important questions such as how galaxies acquire magnetic fields, and whether all such fields are produced by a dynamo effect. Can these galaxy halo fields illuminate the mysterious origin of the even larger intergalactic magnetic fields that have been observed?”

The findings are published in two papers in the journals Astronomy & Astrophysics and the Monthly Notices of the Royal Astronomical Society.

Editors' Recommendations

Topics

Georgina Torbet

Space Writer

Georgina is the Digital Trends space writer, covering human space exploration, planetary science, and cosmology. She…

Outdoors

The best portable power stations

EcoFlow DELTA 2 on table at campsite for quick charging.

Affordable and efficient portable power is a necessity these days, keeping our electronic devices operational while on the go. But there are literally dozens of options to choose from, making it abundantly difficult to decide which mobile charging solution is best for you. We've sorted through countless portable power options and came up with six of the best portable power stations to keep your smartphones, tablets, laptops, and other gadgets functioning while living off the grid.
The best overall: Jackery Explorer 1000

Jackery has been a mainstay in the portable power market for several years, and today, the company continues to set the standard. With three AC outlets, two USB-A, and two USB-C plugs, you'll have plenty of options for keeping your gadgets charged.

Emerging Tech

CES 2023: HD Hyundai’s Avikus is an A.I. for autonomous boat and marine navigation

Demonstration of NeuBoat level 2 autonomous navigation system at the Fort Lauderdale International Boat Show

This content was produced in partnership with HD Hyundai.
Autonomous vehicle navigation technology is certainly nothing new and has been in the works for the better part of a decade at this point. But one of the most common forms we see and hear about is the type used to control steering in road-based vehicles. That's not the only place where technology can make a huge difference. Autonomous driving systems can offer incredible benefits to boats and marine vehicles, too, which is precisely why HD Hyundai has unveiled its Avikus AI technology -- for marine and watercraft vehicles.

More recently, HD Hyundai participated in the Fort Lauderdale International Boat Show, to demo its NeuBoat level 2 autonomous navigation system for recreational boats. The name mashes together the words "neuron" and "boat" and is quite fitting since the Avikus' A.I. navigation tech is a core component of the solution, it will handle self-recognition, real-time decisions, and controls when on the water. Of course, there are a lot of things happening behind the scenes with HD Hyundai's autonomous navigation solution, which we'll dive into below -- HD Hyundai will also be introducing more about the tech at CES 2023.

Computing

This AI cloned my voice using just three minutes of audio

acapela group voice cloning ad

There's a scene in Mission Impossible 3 that you might recall. In it, our hero Ethan Hunt (Tom Cruise) tackles the movie's villain, holds him at gunpoint, and forces him to read a bizarre series of sentences aloud.

"The pleasure of Busby's company is what I most enjoy," he reluctantly reads. "He put a tack on Miss Yancy's chair, and she called him a horrible boy. At the end of the month, he was flinging two kittens across the width of the room ..."