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)
Envisioning the next decade of Galactic Center science: a laboratory for the study of the physics and astrophysics of supermassive black holes
We describe several research questions driving the next decade of Galactic center science. Is General Relativity (GR) the correct description for supermassive black holes? What is the nature of star formation in the GC? How do stars and compact objects dynamically interact with the SMBH? What physical processes drive gas accretion onto Sgr A*?