The mismatch between the disk's spin axis and the black hole’s spin causes an effect called Lense-Thirring precession. This means both the accretion disk and its jet wobble or precess like a spinning top that isn’t…
Black Hole’s Light and Radio Waves Dance Reveals New Cosmic Secrets
Scientists recently observed an extraordinary event near a black hole. When a star gets too close, the intense gravity tears it apart. This event is called a tidal disruption event (TDE). In this case, scientists tracked unusual flickering in both x-rays and radio waves. The patterns reveal new facts about how black holes and their surroundings interact.
A star passed very near the center of a galaxy called LEDA 145386. The supermassive black hole there tore the star apart. This break-up caused some materials to fall toward the black hole. They created an accretion disk, a disk of hot gas spinning fast around the black hole.
The star’s destruction also launched small jets of particles shooting out at near light speed. These jets and disk spins often don’t line up perfectly with the black hole’s spin. Because of this, strange effects happen due to general relativity a theory by Einstein explaining gravity in very strong fields.
Lense-Thirring Precession: A Cosmic Twist
The mismatch between the disk’s spin axis and the black hole’s spin causes an effect called Lense-Thirring precession. This means both the accretion disk and its jet wobble or precess like a spinning top that isn’t standing straight.
This wobble changes where we see emissions from x-rays and radio waves coming from. Before now, scientists had not seen direct evidence that both disk and jet shifted together. This study provides strong proof they precess as one system.
How Scientists Tracked It All
The team watched this TDE closely using x-ray telescopes like Swift Observatory and NASA’s NICER instrument. They detected bright flashes of x-ray light that repeated every 19.6 days. Simultaneously, radio telescopes such as VLA monitored matching variations in radio waves.
This nearly perfect match showed these two signals come from one linked source affected by the same cosmic dance tilted disks pulling on their jets around the black hole.
The Importance of Short-Term Variations in X-rays and Radio Waves
This discovery helps us understand how material behaves close to black holes under extreme gravity. It also teaches us about how jets are launched into space, shaping galaxies over time.
What Makes These Variations Special?
The x-ray brightness changed by over ten times during each cycle lasting about 20 days! Usually, such short-term changes are hard to catch since TDEs evolve slowly over months or years.
Moreover, radio signals also showed surprising fluctuations every 19 to 40 days with different spectra shifting from thick to thin states indicating physical changes near emissions sources.
The Clues About Black Hole Spin
The researchers found this behavior fits best if the central black hole spins relatively slowly compared to what was expected before. This affects how strong precession appears for different viewing angles leading to resultant observable signals across wavelengths like those in this study.
A New Class of Radio Transient Events?
TDE AT2020afhd revealed unexpected fast radio variability never documented before this way which could hint at more such events awaiting discovery via regular high-cadence monitoring.
This study confirms predicted effects caused by strong gravitational forces bending objects’ paths close to massive bodies.
The clear pattern linking both disk bright x-ray emission together with matching radio pulses is compelling evidence for linked disk-jet precession caused by Lense-Thirring torques.
Scientists can now better explore how supermassive black holes impact their environments including star destruction dynamics plus feedback shaping galactic evolution overall.
Additionally, to stay updated with the latest developments in STEM research, visit ENTECH Online. Basically, this is our digital magazine for science, technology, engineering, and mathematics. Further, at ENTECH Online, you’ll find a wealth of information.
Reference
Wang, Y., Lin, Z., Wu, L., Lei, W., Wei, S., Zhang, S., Ji, L., Del Palacio, S., Baldi, R. D., Huang, Y., Liu, J., Zhang, B., Yang, A., Chen, R., Zhang, Y., Wang, A., Yang, L., Charalampopoulos, P., Williams-Baldwin, D. R. A., . . . Chen, T. (2025). Detection of disk-jet coprecession in a tidal disruption event. Science Advances, 11(50). https://doi.org/10.1126/sciadv.ady9068
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I’m a web developer and science writer with a Master’s degree in Computer Applications (MCA) from Pune University.
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