S21A0053
S21A0053
The star S0-2 orbiting around the Galactic central supermassive black hole is the best probe for the test of general relativity (GR). We have already rejected Newtonian gravity from the accurate gravity theory, by observing the gravitational redshift effects during the periapse passage of S0-2 in 2018. Next issue is the discrimination of GR and the other candidate gravity theories which are not rejected by the present solar system and cosmological tests. For this issue, the mesurement of GR effect other than the gravitational redshift is useful, because the true gravity theory should pass any test. Here we propose observations of S0-2 to measure the GR orbital precession effects. Our method makes use of the spectroscopic observations of the redshift of photons coming from S0-2, complementary to the astromery by VLT/GRAVITY, and providing an independent GR test. This spectroscopic method is our own idea that has not been performed so far, and Subaru/IRCS/NGS-AO is sensitive enough to carry out this experiment. We explore the new spectroscopic approach to the orbital precession effect, and perform an independent test of GR to discriminate from the other candidate gravity theories. The past data cannot be used in our method, and 2021 is the first chance to take data for this approach.
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