Fig. 11.
Calculated semi-major axis of the X8 source as a function of its eccentricity assuming an edge-on elliptical orbit. The horizontal lines mark the characteristic scales of the known young stellar populations in the GC region: S stars and CW disk members (Genzel et al. 2010). The uppermost line marks the half-light radius of the NSC, rhl = (4.2 ± 0.4) pc, according to Schödel et al. (2014).
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