Testing the gravitational theory with short-period stars around our Galactic Center
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Testing the gravitational theory with short-period stars around our Galactic Center

  • Author(s): Hees, A
  • Ghez, AM
  • Do, T
  • Lu, JR
  • Morris, MR
  • Becklin, EE
  • Witzel, G
  • Boehle, A
  • Chappell, S
  • Chen, Z
  • Chu, D
  • Ciurlo, A
  • Dehghanfar, A
  • Gallego-Cano, E
  • Gautam, A
  • Jia, S
  • Kosmo, K
  • Martinez, GD
  • Matthews, K
  • Naoz, S
  • Sakai, S
  • Schödel, R
  • et al.
Abstract

Motion of short-period stars orbiting the supermassive black hole in our Galactic Center has been monitored for more than 20 years. These observations are currently offering a new way to test the gravitational theory in an unexplored regime: in a strong gravitational field, around a supermassive black hole. In this proceeding, we present three results: (i) a constraint on a hypothetical fifth force obtained by using 19 years of observations of the two best measured short-period stars S0-2 and S0-38 ; (ii) an upper limit on the secular advance of the argument of the periastron for the star S0-2 ; (iii) a sensitivity analysis showing that the relativistic redshift of S0-2 will be measured after its closest approach to the black hole in 2018.

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