From fd20ab688759f3dfc3f7796ac0b1118e21ee5b22 Mon Sep 17 00:00:00 2001 From: Aaron LI Date: Fri, 20 Oct 2017 10:22:24 +0800 Subject: clusters/halo: Determine magnetic field by fraction of its energy density * Rewrite "magnetic_field()" function to calculate the mean magnetic field strength within ICM according its energy density fraction w.r.t. the ICM thermal energy density. * Remove config options "b_mean" and "b_index", which are replaced with the option "eta_b", the assumed magnetic energy density fraction w.r.t. the ICM thermal energy density. --- fg21sim/configs/20-extragalactic.conf.spec | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) (limited to 'fg21sim/configs/20-extragalactic.conf.spec') diff --git a/fg21sim/configs/20-extragalactic.conf.spec b/fg21sim/configs/20-extragalactic.conf.spec index 2c879ac..75ea0ec 100644 --- a/fg21sim/configs/20-extragalactic.conf.spec +++ b/fg21sim/configs/20-extragalactic.conf.spec @@ -119,14 +119,10 @@ # Unit: [Gyr] tau_merger = float(default=2.0, min=1.0, max=5.0) - # Magnetic field scaling relation for clusters - # Reference: Cassano et al. 2012, A&A, 548, A100, Eq.(1) - # - # The mean magnetic field assumed - # Unit: [uG] - b_mean = float(default=1.9, min=0.1, max=10) - # The index of the scaling relation - b_index = float(default=1.5, min=0.0, max=3.0) + # The fraction of the magnetic field energy density w.r.t. the ICM + # thermal energy density, which is used to determine the mean magnetic + # field strength within the ICM and is also assumed to be uniform. + eta_b = float(default=0.001, min=1e-5, max=0.1) # Filename prefix for this component prefix = string(default="cluster") -- cgit v1.2.2