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Stella Offner edited subsection_Fourier_Statistics_In_this__.tex
over 8 years ago
Commit id: b783807b233c8a16fd56a557c7a05163bb3f2b32
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In Figure 6, VCS also shows a horizontal offset between the two curves.
%confirming that there is more power in velocities at all scales in the case with feedback
However, we also note a difference in both VCS power-law fits, and, more importantly, the break point between the two fits.
{\bf Physically, this transition point indicates the scale at which the dispersion of the density fluctuations is equal to the mean density.
%{\bf the breakpoint: what it means and how it is determined needs to be described. The specific position and how this corresponds to a spatial or velocity scale needs to be noted: e.g. box size ~ 1 = 5pc, so k=0.1 = 0.5 pc; velocity range = +/-20 km/s, so k=0.1 is ~ 2 km/s. }
The output without feedback
%Can use both w/wo feedback and pure turbulence.
%(our purely turbulent run? Go back and denotes everything like this?)
appears to have a larger range over which it is dominated by velocity fluctuations ($k\simeq 1-0.05$). The velocity-dominated regime is smaller for the run with feedback ($k\simeq 1-0.1$), such that changes in gas density affect a greater portion of the structure
apparent in the cloud emission.
In this regime, irrespective of the break point, the trend should be a power-law determined by the underlying velocity structure function. For supersonic shocks, we expect $P(k_v \propto k_v^{-4}$ \citep{lazarian08}. %&pogosyan
In the density dominated regime,
It makes sense that feedback extends the density-dominated regime since the winds create density enhancements on larger scales by sweeping up material. Thus, variation in the breakpoint location, could provide useful insight into the underlying turbulent driving and the importance of feedback.
% (here than in the other run...trying to be grammatically correct with comparisons while including sentence variation--not sure if this sentance is grammatically correct). %SSRO Good job. made some small edits to address content.