2026-06-04 ノースウェスタン大学
This composite image shows evidence for a wind blowing away from Sagittarius A* (Sgr A*), the supermassive black hole in the center of our galaxy. The white dot in the center of the image shows Sgr A*. In orange is data from the Atacama Large Millimeter/Submillimeter Array radio telescopes in Chile, mapping the location of cold gas composed of carbon monoxide in the image. In blue is X-ray data from NASA’s Chandra X-ray Observatory. Image by NASA/CXC/Northwestern University/Mark Gorski
＜関連情報＞
- https://news.northwestern.edu/stories/2026/06/found-milky-way-black-holes-missing-wind
- https://iopscience.iop.org/article/10.3847/2041-8213/ae63cf
天の川銀河の中心ブラックホールから発生する活発な風の発見 The Discovery of an Active Wind from the Milky Way’s Central Black Hole
Mark D. Gorski and Lena Murchikova
The Astrophysical Journal Letters Published: 2026 June 4
DOI:10.3847/2041-8213/ae63cf
Abstract
Every large galaxy has a black hole in its center. The interaction between the black hole and its host profoundly shapes galactic evolution and the Universe as a whole. The key features of this interaction are black hole jets—or more generally, winds—which every black hole must have. Despite the proximity and importance of our Galaxy’s central black hole, Sagittarius A* (Sgr A*), the active wind from it has eluded scientists for over half a century. Here we report the discovery of a large active wind from Sgr A* using unprecedentedly deep (Tb ∼ 30 mK) and high angular resolution (≲0”.25) observations with the Atacama Large Millimeter/Submillimeter Array (ALMA). We detect a large conical clearing in the cold molecular gas surrounding Sgr A* that is at least 1 parsec long and has a ∼45° opening angle. The morphology and energetics of this structure are consistent with active clearing of gas by a hot wind from Sgr A*.
