https://phys.org/news/2019-01-revealing-black-hole-heart-galaxy.html

Using the observation technique of very long baseline interferometry (VLBI) at a frequency of 86 GHz, which combines many telescopes to form a virtual telescope the size of the Earth, the team succeeded in mapping out the exact properties of the light scattering blocking our view of Sagittarius A*. The removal of most of the scattering effects has produced a first image of the surroundings of the black hole.

The high quality of the unscattered image has allowed the team to constrain theoretical models for the gas around Sagittarius A. The bulk of the radio emission is coming from a mere 300 millionth of a degree, and the source has a symmetrical morphology. "This may indicate that the radio emission is produced in a disk of infalling gas rather than by a radio jet," explains Issaoun, who has tested several computer models against the data. "However, that would make Sagittarius A an exception compared to other radio-emitting black holes. The alternative could be that the radio jet is pointing almost at us."