Black holes are powerful cosmic engines. They provide the energy behind quasars and other active galactic nuclei (AGNs). This is due to the interaction of matter with its powerful gravitational and magnetic fields.
are powerful cosmic engines. They provide the energy behind quasars and other active galactic nuclei . This is due to the interaction of matter with its powerful gravitational and magnetic fields.Technically, a black hole doesn't have a magnetic field on its own, but the dense plasma surrounding the black hole as an accretion disk does. As the plasma swirls around the black hole, the charged particles within it generate an electrical current and magnetic field.
Our Sun reverses its magnetic field every 11 years, which drives the 11-year cycle of sunspots astronomers have observed since the 1600s. Even the Earth undergoes magnetic reversals every few hundred thousand years.In 2018, an automated sky survey found a sudden change in a galaxy 239 million light-years away. Known as 1ES 1927+654, the galaxy had brightened by a factor of 100 in visible light. Soon after its discovery, the Swift Observatory captured its glow in X-rays and ultraviolet.
At the same time, the intensity of light in visible and ultraviolet increased which suggested that parts of the black hole's accretion disk were getting hotter. Neither of these effects is what you'd expect with a tidal disruption event.
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