From a1d4cb4b6d637112aa97249b8150e8236002f09f Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Tue, 31 Oct 2017 16:31:41 +0800
Subject: bin/cosmo_calc.py: Add evolution factor -E/--evolution-factor

---
 acispy/cosmo.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'acispy')

diff --git a/acispy/cosmo.py b/acispy/cosmo.py
index 62b9191..4840122 100644
--- a/acispy/cosmo.py
+++ b/acispy/cosmo.py
@@ -1,8 +1,8 @@
-# Copyright (c) 2017 Weitian LI <liweitianux@live.com>
+# Copyright (c) 2017 Weitian LI <weitian@aaronly.me>
 # MIT license
 
 """
-Cosmology calculator for Chandra ACIS.
+Cosmology calculator with Chandra ACIS-specific quantities support.
 """
 
 import math
@@ -25,6 +25,9 @@ class Calculator:
         self.Ob0 = Ob0
         self._cosmo = FlatLambdaCDM(H0=H0, Om0=Om0, Ob0=Ob0)
 
+    def evolution_factor(self, z):
+        return self._cosmo.efunc(z)
+
     def luminosity_distance(self, z, unit="Mpc"):
         dist = self._cosmo.luminosity_distance(z)
         return dist.to(au.Unit(unit)).value
-- 
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