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- W2995782875 endingPage "L8" @default.
- W2995782875 startingPage "L8" @default.
- W2995782875 abstract "The hierarchical nature of galaxy formation suggests that a supermassive black hole binary could exist in our galactic center. We propose a new approach to constraining the possible orbital configuration of such a binary companion to the galactic center black hole Sgr A* through the measurement of stellar orbits. Focusing on the star S0-2, we show that requiring its orbital stability in the presence of a companion to Sgr A* yields stringent constraints on the possible configurations of such a companion. Furthermore, we show that precise measurements of {it time variations} in the orbital parameters of S0-2 could yield stronger constraints. Using existing data on S0-2 we derive upper limits on the binary black hole separation as a function of the companion mass. For the case of a circular orbit, we can rule out a 10^5 M_sun companion with a semimajor axis greater than 170 astronomical units or 0.8 mpc. This is already more stringent than bounds obtained from studies of the proper motion of Sgr A*. Including other stars orbiting the galactic center should yield stronger constraints that could help uncover the presence of a companion to Sgr A*. We show that a companion can also affect the accretion process, resulting in a variability which may be consistent with the measured infrared flaring timescales and amplitudes. Finally, if such a companion exists, it will emit gravitational wave radiation, potentially detectable with LISA." @default.
- W2995782875 created "2019-12-26" @default.
- W2995782875 creator A5007840528 @default.
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- W2995782875 creator A5077199483 @default.
- W2995782875 date "2019-12-31" @default.
- W2995782875 modified "2023-10-18" @default.
- W2995782875 title "A Hidden Friend for the Galactic Center Black Hole, Sgr A*" @default.
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- W2995782875 doi "https://doi.org/10.3847/2041-8213/ab5e3b" @default.