Relativistic redshift of the star S0-2 orbiting the Galactic Center supermassive black hole
The general theory of relativity predicts that a star passing close to a supermassive black hole should exhibit a relativistic redshift. We used observations of the Galactic Center 16-year-orbit star S0-2 to test this prediction. We combined the measurements from March to September 2018, which cover three events during S0-2’s closest approach to the black hole with existing measurements from 1995–2017. We detected a combination of special relativistic and gravitational redshift. (See full abstract in the title link)