Recent explorations have unveiled that Sagittarius A*, the colossal black hole residing at the core of the Milky Way, exhibits a dizzying speed of rotation, influencing time and space around it in its wake.
Understanding the Fabric of Space-Time
Space-time, a four-dimensional continuum, encapsulates our perception of space, amalgamating the one-dimensional time with three-dimensional space. This results in a spatial fabric that morphs in response to the presence of massive celestial bodies. A group of dedicated physicists utilized NASA's Chandra X-ray Observatory, engineered to detect X-ray emissions from the universe's hot regions, to study the black hole. Located a staggering 26,000 light-years away from Earth, the black hole's behavior offers insights into the far reaches of our universe.
Sagittarius A*'s Rotational Speed
The team employed the renowned outflow method to calculate Sagittarius A*'s rotational velocity. This technique scrutinizes radio waves and X-ray emissions found in the accretion disk — the gas and material surrounding black holes. This method was instrumental in confirming the black hole's self-rotation, leading to a phenomenon known as the Lense-Thirring effect or frame dragging [3].
Deciphering the Lense-Thirring Effect
The Lense-Thirring effect, as explained by the study's pioneer Ruth Daly, a physics professor at Penn State University, results from the black hole's rotation dragging along space-time. Since devising the outflow method, Daly has analyzed over 750 supermassive black holes, aiming to comprehend their rotation. Her work has shed light on how the rapid rotation of Sagittarius A* significantly distorts the shape of space-time in its proximity.
The Influence of Black Hole Rotation
The rotation of a black hole is denoted with a value ranging from 0 (no rotation) to 1 (maximum rotation). Sagittarius A* was found to have a spin angular momentum value between 0.84 and 0.96, while M87* — a black hole in the Virgo galaxy cluster located 55 million light-years away — has a rotation value close to 1.
Daly emphasized the critical role of this rotation in shaping the entire galaxy. The asymmetry of space-time around a rapidly spinning black hole, she explained, may appear squashed, similar to a soccer ball. However, this distortion is a crucial tool for astronomers aiming to understand the formation and evolution of galaxies.
In conclusion, the study of Sagittarius A*'s fast spin and its impact on space-time contributes to our understanding of supermassive black holes and the dynamics of galaxies.
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