Fig. 2.

Median of the marginalized posterior distribution of the spike radius Rsp (black dashed), and associated 95% (red shaded) and 99.7% (light red shaded) confidence contours as a function of the slope γ of the corresponding dynamically constrained outer halos, using the combined VLT + Keck data up to 2009 (left panel), VLT-only data up to 2016 (middle panel), and VLT + Keck data up to 2016 (right panel). The upper right white regions correspond to excluded values of the spike radius. The lower left white regions are outside the 99.7% best-fit contours, but cannot robustly be interpreted in terms of exclusion of the associated values of the spike radius since the Bayesian evidence does not favour the presence of a spike over the BH-only model. The contours are derived for values of the slope of the outer halo dynamically constrained by McMillan (2017), and linearly interpolated to get smooth curves. The prediction from Gondolo & Silk (1999) is also shown as a benchmark model (cyan solid).
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