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We propose that the transformation of NSCs into SMBHs occurs via runaway tidal captures, once NSCs exceed a certain critical central density and velocity dispersion.
Our best solar models, however, indicate that the central density of the Sun is around 150 grams per centimetre cubed, which is far from infinite.
For example, in the Sun the central density is 158 grams per cubic cm; the pressure is calculated to be more than one billion times the pressure of Earth's atmosphere at sea level and the temperature around 15 million K (27 million °F).
The hard X-ray emission from the suprathermal electron population, generated by the LH waves in these favourable conditions, is considerably increased even at densities that have so far been considered the upper limit for efficient LHCD operation in FTU, namely, line density ne av≈1.3×1020 m−3, central density ne0≈1.5×1020 m−3, peripheral density (at r/a≈0.8) ne_0.8≈0.4×1020 m−3.
Figure 18 Migration test: central density evolution.
Figure 19 Migration test: central density evolution at different resolutions.
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The high central densities of the gas imply radiative cooling times of only 109 years or so.
The high central densities of YSCs may result via dynamical evolution of already-formed stars during and after star cluster formation.
This poses a serious puzzle theoretically: either galaxy formation becomes effectively stochastic on scales smaller than ~0.1 L* or the central densities of dark matter subhalos are significantly lower than predicted in dissipationless simulations.
Even the central star density in NGC 3603 is similar to that found in R136.
Even a moderate increase in the stellar central surface density does not yield any global spiral modes.
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