From 6938f435b70bb380a438e400f4f1cbdcd92e2faa Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Thu, 19 Oct 2017 21:47:19 +0800
Subject: clusters/halo: Add kT_cluster() to calculate the cluster ICM
temperature
---
fg21sim/extragalactic/clusters/helper.py | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
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
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