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A supermassive black hole is spitting a high-energy jet toward Earth

July 26, 2023
in Science
A supermassive black hole is spitting a high-energy jet toward Earth
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a jet of white light shooting through space

An illustration shows the blazar Markarian 421 blasting out high-energy jet as seen by NASA’s IXPE mission.
(Image credit: NASA/Pablo Garcia)

A NASA mission has observed a supermassive black hole pointing its highly energetic jet straight toward Earth. Don’t panic just yet, though. As fearsome as this cosmic event  is, it’s located at a very safe distance of about 400 million light-years away.

Actively feeding supermassive black holes, including the one at hand, are surrounded by swirling disks of matter called accretion disks which gradually feed them over time. Some of the material they don’t swallow is then channeled toward their poles, where it’s subsequently blasted out at near-light,  or relativistic,  speed. This creates highly energetic and extremely bright electromagnetic radiation. In some cases, like with NASA’s latest muse, that jet is pointed straight at Earth. Those events are known as blazars.

This blazar, designated Markarian 421 and located in the constellation Ursa Major, was observed with NASA’s Imaging X-ray Polarimetry Explorer (IXPE), which launched in December 2021. IXPE observes a property of magnetic fields called polarization, which refers to the fields’ orientation. The polarization of the jet blasted out by Markarian 421 revealed a surprise for astronomers, showing that the part of the jet where particles are being accelerated is also home to a magnetic field with a helical structure. 

Blazar jets can stretch across space for millions of light-years, but the mechanisms that launch them aren’t yet well-understood. However, these new discoveries surrounding the jet of Markarian 421 could shed some light on this extreme cosmic phenomenon. 

Related: X-ray view shows how supermassive black holes speed up particles in jets

“Markarian 421 is an old friend for high-energy astronomers,” lead researcher behind the discovery and Italian Space Agency astrophysicist, Laura Di Gesu, said in a statement. “We were sure the blazar would be a worthwhile target for IXPE, but its discoveries were beyond our best expectations, successfully demonstrating how X-ray polarimetry enriches our ability to probe the complex magnetic field geometry and particle acceleration in different regions of relativistic jets.”

IXPE dives deeper into the twisted structure of blazar jets

The main reason jets of feeding supermassive black holes are so bright is that particles approaching the speed of light give off tremendous amounts of energy and behave according to the physics of Einstein’s theory of special relativity. 

Blazar jets also get an extra boost to such brightness because their orientation towards us causes wavelengths of light associated with their jets to “bunch up,” increasing both their frequencies and energies. This is similar to how sound waves from the siren of an approaching ambulance “bunch up” to cause an increase in frequency that makes it sound more high-pitched. 

As a result of these two effects, blazars can often outshine the combined light of every star in the galaxies that house them. And now, IXPE has used that light to paint a picture of the physics going on at the heart of Markarian 421’s jet and even identify the glowing beam’s point of origin.

Previously, models of blazar jets had hinted that they’re accompanied by helical magnetic fields, almost like DNA in living cells, except single- rather than double-stranded. What wasn’t predicted, however, was the fact that the magnetic helix would host areas where particles are being accelerated. 

a T-shaped satellite in space

An artist’s depiction of the IXPE observatory in space observing the universe in X-rays. (Image credit: NASA)

“We had anticipated that the polarization direction might change, but we thought large rotations would be rare, based on previous optical observations of many blazars,” research co-author and Massachusetts Institute of Technology physicist, Herman Marshal, said. “So, we planned several observations of the blazar, with the first showing a constant polarization of 15%.”

Even more remarkably, analysis of IXPE’s data showed that the polarization of the jet dropped to 0% between its first and second observations. This showed the team the magnetic field was turning like a corkscrew. 

“We recognized that the polarization was actually about the same but its direction literally pulled a U-turn, rotating nearly 180 degrees in two days,” Marshall said. “It then surprised us again during the third observation, which started a day later, to observe the direction of polarization continuing to rotate at the same rate.”

a jet of light streaking through space

An artist’s concept of a feeding supermassive black hole with a jet streaming outward at nearly the speed of light. (Image credit: NASA/JPL-Caltech)

During these maneuvers, measurements of electromagnetic radiation in the form of optical, infrared and radio light showed no effect on the stability and structure of the jet itself, even when X-ray emissions did change. This implied a shockwave traveling along the twisted magnetic field from Markarian 421.

Hints of such a phenomenon have once been seen in the jet of another blazar witnessed by IXPE, Markarian 501, but the team’s new findings represent more clearcut evidence that a helical magnetic field does indeed contribute to a traveling shockwave that’s accelerating jet particles to relativistic speeds.

The team behind the work intends to continue studying Markarian 421 as well as  identify other blazars to find some with similar qualities in pursuit of revealing a mechanism that powers the extreme and bright outflows characteristic of these phenomena.

“Thanks to IXPE, it’s an exciting time for studies of astrophysical jets,” Di Gesu concluded.

The team”s research was published on Monday (July 17) in the journal Nature Astronomy.

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: [email protected].

Breaking space news, the latest updates on rocket launches, skywatching events and more!

Robert Lea is a science journalist in the U.K. whose articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space, Newsweek and ZME Science. He also writes about science communication for Elsevier and the European Journal of Physics. Rob holds a bachelor of science degree in physics and astronomy from the U.K.’s Open University. Follow him on Twitter @sciencef1rst.

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Copyright for syndicated content belongs to the linked Source : Space.com – https://www.space.com/supermassive-black-hole-jet-nasa-ixpe-x-ray

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