An international research team led by the Université de Montréal, with participation from Michigan State University, used the James Webb Space Telescope to observe how supermassive black holes obtain gas needed for growth. The findings, published in The Astrophysical Journal Letters on July 14, provide new insights into a longstanding astronomical question about black hole feeding mechanisms.
Nearly all large galaxies contain supermassive black holes at their centers, objects millions or billions of times more massive than the sun. When gas and dust fall toward these black holes, the material heats up and creates bright, energetic regions called active galactic nuclei. These active black holes can launch powerful jets that carry energy across galaxies, heating surrounding gas and influencing star formation over billions of years. This activity creates a theoretical puzzle: if jets heat nearby gas, making it harder to cool and fall inward, black holes should eventually starve themselves. Yet many continue feeding.
The leading explanation proposes a self-regulating cycle where gas heated by black hole activity eventually cools, condenses into narrow filament structures, and falls back toward the galaxy’s center. The research team used the James Webb Space Telescope’s NIRSpec instrument to study NGC 4696, the central galaxy in the Centaurus Cluster approximately 145 million light-years away. The telescope observed the galaxy for nearly eight hours, mapping gas motion within the black hole’s sphere of influence with remarkable detail—resolving structures about 30 light-years across.
The observations revealed an S-shaped rotating disk of gas around the supermassive black hole, stretching nearly 800 light-years across with material moving at speeds up to 600 kilometers per second. Crucially, this disk appears physically connected to a large inward-flowing gas filament, providing strong observational evidence that cool gas filaments supply material to supermassive black holes. Computer simulations developed by the research team closely reproduced the observed behavior, supporting the theory that cooling gas, magnetic fields, and black hole jets function together in a self-regulating cycle that enables black holes to create conditions for their own fuel supply.
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