A three-light-year-long, cone-shaped cavity in the gas cloud surrounding our galaxy’s center has provided the first direct evidence of a wind streaming from Sagittarius A*. This discovery resolves a 50-year-old astrophysical mystery, confirming that even dormant supermassive black holes actively shape their immediate cosmic environment.
Researchers achieved this breakthrough by analyzing five years of data from the Atacama Large Millimeter/submillimeter Array in Chile. By filtering out the intense radio glare of the black hole, the team mapped cold molecular gas with unprecedented clarity. Complementary data from NASA's Chandra X-ray Observatory confirmed the void is filled with high-speed, hot gas moving at thousands of kilometers per second.
Mark Gorski of Northwestern University noted that because the universe lacks perfect vacuums, black holes must inevitably generate these outflows. While Sagittarius A
currently remains in a quiet state, the wind has likely persisted for at least 20,000 years. Elena Murchikova, a professor at Northwestern who co-led the study, emphasized that this finding proves our black hole is not an outlier, providing a vital local baseline for understanding how dormant black holes influence star formation and galactic evolution over eons.
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