HEPC/LEPC spectra can be simulated with the HEASARC XSPEC program. The following dialog illustrates the simulation of the spectrum of a 5 ksec HEPC/LEPC observation of a Raymond-Smith plasma with an emission integral of 1060 cm-3, temperature of 107.5 K, column density of 1021 cm-2, at a distance of 10 kpc.
!xspec 13:04:44 21-Mar-96
XSPEC> model raymond wabs
mo = wabs[2] (raymond[1])
Input parameter value, delta, min, bot, top, and max values for ...
Mod parameter 1 of component 1 raymond kT(keV)
1.000 1.0000E-02 8.0000E-03 8.0000E-03 64.00 64.00
2.73
Mod parameter 2 of component 1 raymond Abundanc
1.000 -1.0000E-03 0. 0. 5.000 5.000
1.0
Mod parameter 3 of component 1 raymond Redshift
0. -1.0000E-03 0. 0. 2.000 2.000
0.0
Mod parameter 4 of component 1 raymond norm
1.000 1.0000E-02 0. 0. 1.0000E+24 1.0000E+24
0.8356
Mod parameter 5 of component 2 wabs nH 10^22
1.000 1.0000E-03 0. 0. 1.0000E+05 1.0000E+06
0.1
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mo = wabs[2] (raymond[1])
Model Fit Model Component Parameter Value
par par comp
1 1 1 raymond kT(keV) 2.73000 +/- 0.
2 2 1 raymond Abundanc 1.00000 frozen
3 3 1 raymond Redshift 0. frozen
4 4 1 raymond norm 0.835600 +/- 0.
5 5 2 wabs nH 10^22 0.100000 +/- 0.
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3 variable fit parameters
XSPEC> fakeit none
For fake data, file # 1 needs response file: lepc.rmf
... and ancillary response file : none
Use counting statistics in creating fake data? (y)
Input optional fake file prefix (max 12 chars):
Override default values for file # 1
Fake data filename (lepc.fak):
T, A, Bkg, cornorm ( 1.0000 , 1.0000 , 1.0000 , 0. ): 5000.0
Net count rate (cts/s) for file 1 360.3 +/- 0.2684
Chi-Squared = 141.4 using 128 PHA bins.
Reduced chi-squared = 1.131
XSPEC> fakeit none
For fake data, file # 1 needs response file: hepc.rmf
... and ancillary response file : none
Use counting statistics in creating fake data? (y)
Input optional fake file prefix (max 12 chars):
Override default values for file # 1
Fake data filename (hepc.fak):
T, A, Bkg, cornorm ( 1.0000 , 1.0000 , 1.0000 , 0. ): 5000.0
Net count rate (cts/s) for file 1 83.20 +/- 0.1290
Chi-Squared = 100.2 using 128 PHA bins.
Reduced chi-squared = 0.8017
XSPEC>
Plots of the raw spectra are shown in Figure 51 and Figure 52. The required response matrices, lepc.rmf and hepc.rmf, may be obtained from the directory /pub/sxg/xspec in the anonymous ftp node sao-ftp.harvard.edu.
XSPEC may be obtained from the software/xanadu directory in the anonymous ftp node legacy.gsfc.nasa.gov.