The Milky Way’s central black hole is in a state of constant, random chaos
In short: New observations from the James Webb Space Telescope reveal that Sagittarius A* is far from quiet. Rather than a steady void, our galaxy's supermassive black hole is experiencing a continuous, unpredictable light show of flares and flickers that never seems to reach a state of rest.
A Northwestern University-led team of astrophysicists, using NASA’s James Webb Space Telescope (JWST), has captured the most detailed look yet at the heart of our galaxy. By utilizing the telescope's near infrared camera (NIRCam), researchers monitored the accretion disk—the swirling mass of gas and dust orbiting the black hole known as Sagittarius A*—to track changes in brightness over time. The study, published on February 18 in The Astrophysical Journal Letters, reveals an environment of unexpected volatility.
The data shows that the black hole is perpetually active, with no periods of rest. The activity manifests in various forms: some faint flickers last only seconds, while others surge for months. The team observed massive eruptions occurring as frequently as five to six big flares per day, interspersed with smaller sub-flares. Farhad Yusef-Zadeh, a professor at Northwestern and lead of the study, noted that the activity appears random, with no discernible pattern found in the observations conducted throughout 2023 and 2024.
Physicists suspect two distinct mechanisms may be driving this 'bubbling' brightness. Yusef-Zadeh suggests that the short, faint flickers might be minor disturbances within the disk, similar to ripples on a river. In contrast, the longer, brighter flares may be caused by more significant events, comparable to tidal waves. While flares are expected in most supermassive black holes, the sheer, unceasing nature of Sagittarius A*’s activity makes it unique. Understanding these dynamics is crucial for learning how such black holes interact with their environments and influence the evolution of their host galaxies, a field of research also explored by astrophysicists like Dr. Becky Smethurst at the University of Oxford.
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Sources
- Summary by Intellect · source: JWST shows our supermassive black hole is FLICKERING
- Also: Flickers and flares: Milky Way’s central black hole constantly bubbles with light
- Also: Flickers and flares: Milky Way's central black hole constantly bubbles with light
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