An Upper Limit on the Spin of SgrA* Based on Stellar Orbits in Its Vicinity
Giacomo Fragione, Abraham Loeb
Abstract
Abstract The spin of the massive black hole (BH) at the center of the Milky Way, SgrA*, has been poorly constrained so far. We place an upper limit on the spin of SgrA* based on the spatial distribution of the S-stars, which are arranged in two almost edge-on disks that are located at a position angle of approximately ±45° with respect to the Galactic plane, on a milliparsec scale around the Galactic center. Requiring that the frame-dragging precession has not had enough time to make the S-star orbital angular momentum precess, the spin of the massive BH at the center of the Milky Way can be constrained to χ ≲ 0.1.
Topics & Concepts
PhysicsMilky WaySpin (aerodynamics)Angular momentumPrecessionAstrophysicsGalactic CenterPosition (finance)Limit (mathematics)AstronomyBlack hole (networking)Orbital motionGalactic tideSpin-upTotal angular momentum quantum numberCenter (category theory)Orbital periodGalaxyLarmor precessionLocal GroupOrbital planeCelestial sphereSpin-flipCelestial mechanicsStellar black holeAstrophysical Phenomena and ObservationsAstronomy and Astrophysical ResearchGalaxies: Formation, Evolution, Phenomena