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Fit Detail for SNRJ 0540.16919
nH was derived by fitting the trail of central source which is
believed not to be piledup.
trail:
nH was derived from the
trail of the central source
.
source=(xswabs * powlaw1d)
reduce chi^2 =
nh = 0.4591 10^22/cm^2
PARAMETERS
DataSet 1: 67 data points  64 degrees of freedom.
Statistic value = 53.6161
Probability [Qvalue] = 0.819365
Reduced statistic = 0.837752
end
central source:
while spectrum from the
central source
is stronly affected by pileup, derived nH is similar.
source=(xswabs * powlaw1d)
reduce chi^2 =
nh = 0.4737 10^22/cm^2
PARAMETERS
DataSet 2: 315 data points  312 degrees of freedom.
Statistic value = 621.508
Probability [Qvalue] = 9.61303e23
Reduced statistic = 1.99201
end
central source(2):
spectrum was refitted with nH fixed at the value derived from the trail of central source.
source=(xswabs * powlaw1d)
reduce chi^2 =
nh = 0.4591 10^22/cm^2
PARAMETERS
DataSet 2: 315 data points  313 degrees of freedom.
Statistic value = 624.558
Probability [Qvalue] = 6.31621e23
Reduced statistic = 1.99539
end
shell:
shell
was fitted by 3 thermal plasma model with nH fixed.
source=(xswabs * ((xsraymond + xsraymond) + xsraymond))
reduce chi^2 =
nh = 0.4591 10^22/cm^2
PARAMETERS
DataSet 3: 157 data points  151 degrees of freedom.
Statistic value = 405.329
Probability [Qvalue] = 3.79852e25
Reduced statistic = 2.6843
end
total:
sum of the spectral models from central source and shell.
no futher fitting was done.
Hwang et al.(2001)
derived nH=0.2~0.5 for various part of the shell(dimension of the nH in their table seems to be a typo(10^22 instead of 10^21)).
source=(xswabs * (((powlaw1d + xsraymond) + xsraymond) + xsraymond))
reduce chi^2 =
nh = 0.4591 10^22/cm^2
PARAMETERS
DataSet 5: 353 data points  345 degrees of freedom.
Statistic value = 876.573
Probability [Qvalue] = 0
Reduced statistic = 2.54079
end
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