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| author | Aaron LI <aly@aaronly.me> | 2017-10-21 22:13:42 +0800 |
|---|---|---|
| committer | Aaron LI <aly@aaronly.me> | 2017-10-21 22:13:42 +0800 |
| commit | 2ee32e7196f83a9350a2b83c03846f6282d7ffe9 (patch) | |
| tree | 7171acc49e70b31ef796c4a58f262c0367a6972f /fg21sim/configs | |
| parent | a8a02a96a78a85ffacf52aa43c158ecc24391af3 (diff) | |
| download | fg21sim-2ee32e7196f83a9350a2b83c03846f6282d7ffe9.tar.bz2 | |
clusters/halo: Rewrite turbulence acceleration & diffusion coefficient!
The previous calculation of the turbulence acceleration efficiency has
significant problems, which is too low, i.e., the acceleration timescale is
too large (~10 Gyr). However, it is reported that turbulent acceleration has
a timescale ~100 Myr (0.1 Gyr). I believe this problem is due to the
over-simplification to the formula proposed by [cassano2005].
Rewrite the turbulence acceleration and diffusion coefficient calculations,
adopting the method proposed by [brunetti2016]. To this end, two new options
"f_lturb" and "f_acc" are introduced to tune the results.
Diffstat (limited to 'fg21sim/configs')
| -rw-r--r-- | fg21sim/configs/20-extragalactic.conf.spec | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/fg21sim/configs/20-extragalactic.conf.spec b/fg21sim/configs/20-extragalactic.conf.spec index 75ea0ec..32311a0 100644 --- a/fg21sim/configs/20-extragalactic.conf.spec +++ b/fg21sim/configs/20-extragalactic.conf.spec @@ -132,8 +132,18 @@ # Giant radio halos for clusters with recent major mergers [[halos]] - # Roughly the fraction of turbulence energy transformed to accelerate - # the electrons, describing the efficiency of turbulence acceleration. + # The turbulence is generally injected at the cluster center during + # a merger. This option parameterize the turbulence injection scale + # to be a fraction of the virial radius of the (main) cluster. + f_lturb = float(default=0.5, min=0.1, max=1.0) + + # The custom option to tune the turbulent acceleration timescale, which + # controls the relativistic particle acceleration efficiencies. + f_acc = float(default=1.5, min=0.1, max=10) + + # The fraction of cluster thermal energy originating from turbulent + # dissipation, which describes the turbulence intensity in the ICM, + # and determines its Mach number. eta_turb = float(default=0.2, min=0.1, max=1.0) # Ratio of the total energy injected into cosmic-ray electrons during |