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#!/usr/bin/env python3
#
# Based on 'coolfunc_calc.sh' from 'chandra-acis-analysis/mass_profile'.
#
# Aaron LI
# Created: 2016-06-19
# Updated: 2016-06-19
#
"""
Calculate the 'cooling function' profile with respect to the
given 'temperature profile' and the average abundance, redshift,
and column density nH, using the XSPEC model 'wabs*apec'.
Sample config file:
------------------------------------------------------------
# Configuration file for `calc_coolfunc.py`
# Aaron LI
# 2016-06-19
# temperature profile fitted & extrapolated by model: [r, T]
tprofile = tprofile.txt
# average abundance (unit: solar)
abundance = 0.5
# abundance table (default: grsa)
abund_table = grsa
# redshift of the object
redshift = 0.0137
# H column density (unit: 10^22 cm^-2)
nh = 0.03
# energy range within which to calculate the cooling function (unit: keV)
energy_low = 0.7
energy_high = 7.0
# output file of the XSPEC script for cooling function calculation
xspec_script = coolfunc.xcm
# output file of the cooling function profile: [r, CF]
coolfunc = coolfunc_profile.txt
------------------------------------------------------------
"""
import argparse
import subprocess
import sys
import os
from datetime import datetime
import numpy as np
import astropy.units as au
from astropy.cosmology import FlatLambdaCDM
from configobj import ConfigObj
def gen_xspec_script(outfile, data):
"""
Generate the XSPEC script for cooling function profile calculation.
Arguments:
* outfile: output file to save the XSPEC script
* data: dictionary used to format the template XSPEC script
"""
xspec_script = """
# Calculate the cooling function profile w.r.t the temperature profile.
#
# Generated by: %(prog_name)s
# Date: %(cur_date)s
# debug (off)
chatter 0
set xs_return_results 1
set xs_echo_script 0
# set tcl_precision 12
query yes
abund %(abund_table)s
dummyrsp 0.01 100.0 4096 linear
# use model 'wabs*apec'
model wabs*apec & %(nh)s & 1.0 & %(abundance)s & %(redshift)s & %(apec_norm)s & /*
# input and output files
set tpro_fn "%(tprofile)s"
set cf_fn "%(coolfunc)s"
if { [ file exists $cf_fn ] } {
exec rm -fv $cf_fn
}
# open files
set tpro_fd [ open $tpro_fn r ]
set cf_fd [ open $cf_fn w ]
# output file header
puts $cf_fd "# radius flux(%(energy_low)s-%(energy_high)s)"
# read data from temperature profile line by line
while { [ gets $tpro_fd line ] != -1 } {
if {[ regexp -- {^\s*#} $line ] == 1} {
# ignore comment line
continue
}
scan $line "%%f %%f" radius temp_val
#puts "radius: $radius, temperature: $temp_val"
# set temperature value
newpar 2 $temp_val
flux %(energy_low)s %(energy_high)s
tclout flux 1
scan $xspec_tclout "%%f %%f %%f %%f" _ _ _ cf_data
#puts "cf_data: $cf_data"
puts $cf_fd "$radius $cf_data"
}
# close & exit
close $tpro_fd
close $cf_fd
tclexit
""" % data
open(outfile, "w").write(xspec_script)
def calc_apec_norm(z, H0=71, OmegaM0=0.27):
"""
Calculate the normalization of the APEC model.
Reference:
https://heasarc.gsfc.nasa.gov/docs/xanadu/xspec/manual/XSmodelApec.html
"""
cosmo = FlatLambdaCDM(H0=H0, Om0=OmegaM0)
DA_cm = cosmo.angular_diameter_distance(z).to(au.cm).value
norm = 1.0e-14 / (4*np.pi * (DA_cm * (1+z))**2)
return norm
def calc_coolfunc(xspec_script, verbose=True):
if verbose:
print("Invoke XSPEC to calculate cooling function profile ...")
subprocess.run(args=["xspec", "-", xspec_script],
stdout=subprocess.DEVNULL)
def main():
parser = argparse.ArgumentParser(
description="Calculate the cooling function profile " +
"w.r.t the temperature profile")
parser.add_argument("config", nargs="?", default="coolfunc.conf",
help="config for cooling function calculation " +
"(default: coolfunc.conf)")
args = parser.parse_args()
config = ConfigObj(args.config)
redshift = config.as_float("redshift")
config_data = {
"prog_name": os.path.basename(sys.argv[0]),
"cur_date": datetime.now().isoformat(),
#
"tprofile": config["tprofile"],
"abundance": config.as_float("abundance"),
"abund_table": config.get("abund_table", "grsa"),
"redshift": redshift,
"nh": config.as_float("nh"),
"energy_low": float(config.get("energy_low", 0.7)),
"energy_high": float(config.get("energy_high", 0.7)),
"xspec_script": config["xspec_script"],
"coolfunc": config["coolfunc"],
"apec_norm": calc_apec_norm(z=redshift),
}
gen_xspec_script(outfile=config["xspec_script"], data=config_data)
calc_coolfunc(xspec_script=config["xspec_script"])
if __name__ == "__main__":
main()
|
