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authorAaron LI <aly@aaronly.me>2017-10-21 22:13:42 +0800
committerAaron LI <aly@aaronly.me>2017-10-21 22:13:42 +0800
commit2ee32e7196f83a9350a2b83c03846f6282d7ffe9 (patch)
tree7171acc49e70b31ef796c4a58f262c0367a6972f /fg21sim/configs/20-extragalactic.conf.spec
parenta8a02a96a78a85ffacf52aa43c158ecc24391af3 (diff)
downloadfg21sim-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/20-extragalactic.conf.spec')
-rw-r--r--fg21sim/configs/20-extragalactic.conf.spec14
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