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#
# Aaron LI
# Created: 2016-05-04
# Updated: 2016-07-12
#
# Change logs:
# 2016-07-12:
# * Add functions "get_name()" and "get_obsid()"
# 2016-07-11:
# * Add functions "get_redshift()" and "get_nh()"
# * Add function "get_owner()"
#
"""
module to process the INFO.json file, contains some handy functions
to extract the needed information.
"""
import json
def load_info(info):
"""
Load data from the INFO.json if necessary.
"""
if isinstance(info, str):
json_str = open(info).read().rstrip().rstrip(",")
return json.loads(json_str)
else:
# assuming that the provided `info` is already a Python dictionary
return info
def get_owner(info):
"""
Determine the owner of the info: 'LWT' or 'ZZH'.
Return:
* 'LWT'
* 'ZZH'
"""
info = load_info(info)
if "IN_SAMPLE" in info.keys():
return "ZZH"
else:
return "LWT"
def get_name(info):
"""
Get the source name from the INFO json file.
"""
info = load_info(info)
name = info["Source Name"]
uname = info.get("Unified Name")
results = {
"name": name,
"uname": uname,
}
return results
def get_obsid(info):
"""
Get the Chandra observation ID from the INFO json file.
"""
info = load_info(info)
obsid = int(info["Obs. ID"])
return obsid
def get_r500(info):
"""
Get the R500 value (in unit pixel and kpc), as well as its errors.
Arguments:
* info: filename of the INFO.json, or the info dictionary
Return:
a dictionary contains the necessary results
"""
info = load_info(info)
if get_owner(info) == "ZZH":
r500_kpc = float(info["R500"])
r500EL_kpc = float(info["R500_err_lower"])
r500EU_kpc = float(info["R500_err_upper"])
else:
r500_kpc = float(info["R500 (kpc)"])
r500EL_kpc = float(info["R500_err_lower (1sigma)"])
r500EU_kpc = float(info["R500_err_upper (1sigma)"])
# Convert kpc to Chandra ACIS pixel
rmax_sbp_pix = float(info["Rmax_SBP (pixel)"])
rmax_sbp_kpc = float(info["Rmax_SBP (kpc)"])
kpc_per_pix = rmax_sbp_kpc / rmax_sbp_pix
r500_pix = r500_kpc / kpc_per_pix
r500EL_pix = r500EL_kpc / kpc_per_pix
r500EU_pix = r500EU_kpc / kpc_per_pix
results = {
"r500_kpc": r500_kpc,
"r500EL_kpc": r500EL_kpc,
"r500EU_kpc": r500EU_kpc,
"r500_pix": r500_pix,
"r500EL_pix": r500EL_pix,
"r500EU_pix": r500EU_pix,
"kpc_per_pix": kpc_per_pix,
}
return results
def get_redshift(info):
"""
Get the redshift from the info json file.
"""
info = load_info(info)
redshift = float(info["redshift"])
return redshift
def get_nh(info):
"""
Get the column density (nH) from the info json file.
"""
info = load_info(info)
if get_owner(info) == "LWT":
nh = float(info["nH (10^22 cm^-2)"])
else:
nh = float(info["nh"])
return nh
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