Possibility of Measuring spin precession of the nearest supermassive black hole by S stars

Abstract

The supermassive black hole (SMBH) with 4 millions solar mass inside the radio-source Sgr A* in our Galactic center is the nearest SMBH. Once the S stars with shorter period are observed, the relativistic precessions especially the Lense-Thirring one can be measured by astronomical observations at 10 micro-arcsecond ($\mu$as) level in future. An interesting but so far no attended problem is that the SMBH has not only spin but also spin precession like the other objects in the universe. In this paper, we study the effect of such spin precession on the orbital precessions of orbiting stars. Our results show that the spin precession can produce a periodic oscillation on the precession of the star's orbital plane, but no obvious effect on the periapse shift. For stars with $O(0.1)$yr period, such visible oscillations occur while the SMBH's spin-precession period is about from few tens of years to hundreds of years. And the period of oscillation is the same with the one of the spin precession. In principle, this oscillating orbital plane's precession can be observed and then the spin and spin precession of the nearest supermassive black hole can be determined.

8 pages, 8 figures

References in corpus (3)

• Gravity Probe B: Final Results of a Space Experiment to Test General Relativity
• Testing the general relativistic ''no-hair'' theorems using the galactic center black hole SgrA*
• Accurate Measurement in the Field of the Earth of the General-Relativistic Precession of the LAGEOS II Pericenter and New Constraints on Non-Newtonian Gravity

Cited by in corpus (4)

• The short-period S-stars S4711, S62, S4714 and the Lense-Thirring effect due to the spin of Sgr A${}^{\ast }$
• Testing the Black Hole No-hair Theorem with Galactic Center Stellar Orbits
• Observational test of ${\mathcal{R}}^2$ spacetimes with the S2 star in the Milky Way galactic center
• Is it possible to measure the Lense-Thirring orbital shifts of the short-period S-star S4716 orbiting Sgr A${}^{\ast }$?