An upper limit on the spin of SgrA${}^{\ast }$ based on stellar orbits in its vicinity

Abstract

The spin of the massive black hole (BH) at the center of the Milky Way, SgrA${}^{\ast }$, has been poorly constrained so far. We place an upper limit on the spin of SgrA${}^{\ast }$ 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 approximately $\pm 45^{\circ }$ 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 $\chi \lesssim 0.1$.

arXiv comment3 pages, 2 figures, accepted by ApJ Lett

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