2/ Clues about this bubble were hidden in ALMA data obtained in 2017 as part of observations with the Event Horizon Telescope.
3/ Hot bubbles were long thought to be linked to high-energy flares in Sagittarius A* but their presence in radio light was elusive, until now.
4/ ALMA’s observations have also allowed astronomers to reveal the magnetic origin of the flares causing the hot gas bubble.
5/ “Hopefully, one day, we will be comfortable saying that we ‘know’ what is going on in Sagittarius A*” Maciek Wielgus, Max Planck Institute for Radio Astronomy.
6. This video shows an animation of the gas bubble orbiting around Sagittarius A*. While the black hole has been directly imaged by the EHT, the orbit and velocity of the bubble are inferred from observations and models. Credit: @Event Horizon 'Scope , @ESO /L. Calçada. Ack.: M. Wielgus