- Do, Tuan
- Hees, Aurelien
- Ghez, Andrea
- Martinez, Gregory D
- Chu, Devin S
- Jia, Siyao
- Sakai, Shoko
- Lu, Jessica R
- Gautam, Abhimat K
- O'Neil, Kelly Kosmo
- Becklin, Eric E
- Morris, Mark R
- Matthews, Keith
- Nishiyama, Shogo
- Campbell, Randy
- Chappell, Samantha
- Chen, Zhuo
- Ciurlo, Anna
- Dehghanfar, Arezu
- Gallego-Cano, Eulalia
- Kerzendorf, Wolfgang E
- Lyke, James E
- Naoz, Smadar
- Saida, Hiromi
- Schödel, Rainer
- Takahashi, Masaaki
- Takamori, Yohsuke
- Witzel, Gunther
- Wizinowich, Peter
- et al.
The general theory of relativity predicts that a star passing close to a supermassive black hole should exhibit a relativistic redshift. In this study, we used observations of the Galactic Center star S0-2 to test this prediction. We combined existing spectroscopic and astrometric measurements from 1995-2017, which cover S0-2's 16-year orbit, with measurements from March to September 2018, which cover three events during S0-2's closest approach to the black hole. We detected a combination of special relativistic and gravitational redshift, quantified using the redshift parameter ϒ. Our result, ϒ = 0.88 ± 0.17, is consistent with general relativity (ϒ = 1) and excludes a Newtonian model (ϒ = 0) with a statistical significance of 5σ.