Fig. 9

Autocorrelation function (ACF) and corresponding power spectra (PS) of the
turbulence in SS2A. a) The
solid line indicates the best fit of the azimuthally averaged ACF (filled circles
with 1σ
error bars) to a model of decaying oscillations as discussed in Sect. 4.3. The zero and e-1 levels are shown by
long- and short-dashed lines. The lag is given in pc for the distance to
the source D =
203 pc. b) The power spectrum of velocity
P1D(k) (solid
line) assumes homogeneous and isotropic turbulence (the wavenumber
). The spectrum is calculated using
Eq. (13). Note the turnover of the
PS at a scale of ≈0.06
pc (km ≈ 17
pc-1),
where energy is being injected into the system. For comparison, the theoretical PS
of a pure Kolmogorov cascade of incompressible turbulence is shown by a dashed line.
The Kolmogorov power-law index is κ1D = −5/3, while the model
value is −2 in the
inertial range at high wavenumbers, k >
km.
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