Relativistic redshift of the star S0-2 orbiting the Galactic center supermassive black hole

Autor: 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
Rok vydání: 2019
Předmět:
Druh dokumentu: Working Paper
DOI: 10.1126/science.aav8137
Popis: General Relativity predicts that a star passing close to a supermassive black hole should exhibit a relativistic redshift. We test this using observations of the Galactic center star S0-2. We combine existing spectroscopic and astrometric measurements from 1995-2017, which cover S0-2's 16-year orbit, with measurements in 2018 March to September which cover three events during its closest approach to the black hole. We detect the combination of special relativistic- and gravitational-redshift, quantified using a redshift parameter, $\Upsilon$. Our result, $\Upsilon=0.88 \pm 0.17$, is consistent with General Relativity ($\Upsilon=1$) and excludes a Newtonian model ($\Upsilon=0$ ) with a statistical significance of 5 $\sigma$.
Comment: 78 pages, 21 figures, accepted to Science, astrometry and radial velocity measurements, and posterior chains available here, http://www.astro.ucla.edu/~ghezgroup/gc/gr/data.zip
Databáze: arXiv
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