Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-11-12
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
revised version of a paper presented at the 2009 Frascati Workshop, Vulcano, May 2009, to be published in Mem.S.A.It
Scientific paper
The analysis of flare start-times confirms the periods found years ago (Aschenbach et al., 2004) in the near-infrared and X-ray light-curves related to the Sgr A* black hole. The assignment of the frequencies found to radial and vertical epicyclic frequencies $\nu\sb{\rm r}$, $\nu\sb{\rm v}$, respectively, as well as to the Kepler orbital frequency $\nu\sb{\rm K}$ reveals resonances of $\nu\sb{\rm v}$ / $\nu\sb{\rm r}$=7:2, and $\nu\sb{\rm K}$ / $\nu\sb{\rm v}$=3:1. The highest observed frequency of 10 mHz is identified as the Kepler frequency corrected by the rotational frame-dragging frequency, as expected from the Lense-Thirring effect. These frequency assignments conclude a black hole mass of M = (4.10-4.34)$\times10\sp{6} M_\odot$ and a spin of a = (0.99473-0.99561).
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