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Fit Detail for SNRJ 0540.1-6919

nH was derived by fitting the trail of central source which isbelieved not to be piled-up.

trail:

source=(xswabs * powlaw1d)
reduce chi^2 =
nh = 0.4591 10^22/cm^2
PARAMETERS

DataSet 1: 67 data points -- 64 degrees of freedom.

--end--

while spectrum from the central source is stronly affected by pile-up, 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.

--end--

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.

--end--

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.

--end--

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.

--end--

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