2020ApJ...904..186I -
Astrophys. J., 904, 186-186 (2020/December-1)
The short-period S-stars S4711, S62, S4714 and the Lense-Thirring effect due to the spin of Sgr A*.
IORIO L.
Abstract (from CDS):
Recently, some S-stars (S4711, S62, S4714) orbiting the supermassive black hole (SMBH) in Sgr A* with short orbital periods (7.6 yr <= Pb <= 12 yr) were discovered. It was suggested that they may be used to measure the general relativistic Lense-Thirring (LT) precessions of their longitudes of ascending node Ω induced by the SMBH's angular momentum J*. In fact, the proposed numerical estimates hold only in the particular case of a perfect alignment of J* with the line of sight, which does not seem to be the case. Moreover, the inclination I and the argument of perinigricon ω also undergo LT precessions for an arbitrary orientation of J* in space. We explicitly show the analytical expressions of {dot}ILT,{dot}ΩLT,ωLT in terms of the SMBH's spin polar angles i*, ε*. It turns out that the LT precessions, in arcseconds per year (′′ yr–1), range within {dot}ILT|≲7^′′yr-1^, |{dot}ΩLT|≲9^′′yr-1^, and -13^′′yr-1^≲{dot}ωLT≲14^′′yr-1^ for S4714, |{dot}ILT|≲5^′′yr-1^, |{dot}ΩLT|≲5^′′yr-1^, and {dot}ωLT|≲10^′′yr-1^ for S62, and |{dot}ILT|≲0.3^′′yr-1^, |{dot}ΩLT|≲0.3^′′yr-1^, and |{dot}ωLT|≲0.7^′′yr-1^ for S4711. For each star, the corresponding values of i{max}•, ε{max}• , and i{min}• ,ε{min}^•^ are determined as well, along with those i0•,ε0• that cancel the LT precessions. The LT perinigricon precessions {dot}ωLT are overwhelmed by the systematic uncertainties in the Schwarzschild ones due to the current errors in the stars' orbital parameters and the mass of Sgr A* itself.
Abstract Copyright:
© 2020. The American Astronomical Society. All rights reserved.
Journal keyword(s):
Kerr black holes - Orbital elements - General relativity
Errata:
erratum vol. 941, art. 209 (2022)
Simbad objects:
6
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