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| -rw-r--r-- | fg21sim/extragalactic/clusters/helper.py | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/fg21sim/extragalactic/clusters/helper.py b/fg21sim/extragalactic/clusters/helper.py index 20ad9d9..daf806b 100644 --- a/fg21sim/extragalactic/clusters/helper.py +++ b/fg21sim/extragalactic/clusters/helper.py @@ -139,6 +139,31 @@ def kT_virial(mass, z=0.0, radius=None): return kT +def kT_cluster(mass, z=0.0, radius=None): + """ + Calculate the temperature of a cluster ICM. + + NOTE + ---- + When a cluster forms, there are accretion shocks forms around + the cluster (near the virial radius) which can heat the gas, + therefore the ICM has a higher temperature than the virial + temperature, which can be estimated as: + T_icm = T_vir + 1.5*T_1 ~ T_vir + 0.8 [keV] + + Reference: Ref.[fujita2003],Eq.(49) + + Returns + ------- + kT_icm : float + The temperature of the cluster ICM. + Unit: [keV] + """ + kT_vir = kT_virial(mass=mass, z=z, radius=radius) + kT_icm = kT_vir + 0.8 + return kT_icm + + def mass_to_kT(mass, z=0.0): """ Calculate the cluster ICM temperature from its mass using the |