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A 2-D TCD-model-based instrument model.
TPSF is a model-based 2D instrument model. It
utilizes the predefined Gaussian, box, and top hat functions of the
TCD library. It can represent the point-spread function (PSF), a
redistribution function that maps photon spatial locations to image
bins.
Note that the top hat function cannot be used in version 3.2
The convolution can be performed using either Fast Fourier Transforms
(FFTs, the default), or the sliding cell technique (see the parameter
fft). If the length of one axis is N and the length of the kernel axis is M (= 2 * xsize + 1), then the
computation time for the sliding cell goes as N * M, i.e. for large kernels the best choice is using the
FFT. A rough rule-of-thumb for 2-D fits is to use the FFT if M_1 * M_2 > 100.
See the documentation on the
INSTRUMENT command.
TPSF Parameters
| 1 | xsize | x-axis 1 sigma width (pixels) |
| 2 | ysize | y-axis 1 sigma width (pixels) |
| 3 | nsigma | kernel width in sigma (Gaussian only) |
| 4 | funcTyp | Gaussian (1) / box (2) / top-hat (3) |
| 5 | fft | convolution type: 1 = FFT / 0 = sliding cell |
This example illustrates the definition of the TPSF1D model.
sherpa> tpsf2d[t2]
sherpa> show t2
tpsf2d[t2]
Param Type Value Min Max Units
----- ---- ----- --- --- -----
1 xsize frozen 4 1 1024
2 ysize frozen 4 1 1024
3 nsigma frozen 2 1e-02 100
4funcTyp frozen 1 0 7
5 fft frozen 1 0 1
The Function Type is: Gaussian.
The parameter funcTyp in t2 model indicate
that the Gaussian function will be used. The 1 sigma width of the
Gaussian is set to xsize=ysize=4 pixels and the total size of the
Gaussian kernel is set to 2 sigma.
- sherpa
-
atten,
bbody,
bbodyfreq,
beta1d,
beta2d,
box1d,
box2d,
bpl1d,
const1d,
const2d,
cos,
delta1d,
delta2d,
dered,
devaucouleurs,
edge,
erf,
erfc,
farf,
farf2d,
fpsf,
fpsf1d,
frmf,
gauss1d,
gauss2d,
gridmodel,
hubble,
jdpileup,
linebroad,
lorentz1d,
lorentz2d,
models,
nbeta,
ngauss1d,
poisson,
polynom1d,
polynom2d,
powlaw1d,
ptsrc1d,
ptsrc2d,
rsp,
rsp2d,
schechter,
shexp,
shexp10,
shlog10,
shloge,
sin,
sqrt,
stephi1d,
steplo1d,
tan,
tpsf1d,
usermodel,
xs,
xsabsori,
xsacisabs,
xsapec,
xsbapec,
xsbbody,
xsbbodyrad,
xsbexrav,
xsbexriv,
xsbknpower,
xsbmc,
xsbremss,
xsbvapec,
xsc6mekl,
xsc6pmekl,
xsc6pvmkl,
xsc6vmekl,
xscabs,
xscemekl,
xscevmkl,
xscflow,
xscompbb,
xscompls,
xscompst,
xscomptt,
xsconstant,
xscutoffpl,
xscyclabs,
xsdisk,
xsdiskbb,
xsdiskline,
xsdiskm,
xsdisko,
xsdiskpn,
xsdust,
xsedge,
xsequil,
xsexpabs,
xsexpdec,
xsexpfac,
xsgabs,
xsgaussian,
xsgnei,
xsgrad,
xsgrbm,
xshighecut,
xshrefl,
xslaor,
xslorentz,
xsmeka,
xsmekal,
xsmkcflow,
xsnei,
xsnotch,
xsnpshock,
xsnsa,
xsnteea,
xspcfabs,
xspegpwrlw,
xspexrav,
xspexriv,
xsphabs,
xsplabs,
xsplcabs,
xsposm,
xspowerlaw,
xspshock,
xspwab,
xsraymond,
xsredden,
xsredge,
xsrefsch,
xssedov,
xssmedge,
xsspline,
xssrcut,
xssresc,
xssssice,
xsstep,
xstbabs,
xstbgrain,
xstbvarabs,
xsuvred,
xsvapec,
xsvarabs,
xsvbremss,
xsvequil,
xsvgnei,
xsvmcflow,
xsvmeka,
xsvmekal,
xsvnei,
xsvnpshock,
xsvphabs,
xsvpshock,
xsvraymond,
xsvsedov,
xswabs,
xswndabs,
xsxion,
xszbbody,
xszbremss,
xszedge,
xszgauss,
xszhighect,
xszpcfabs,
xszphabs,
xszpowerlw,
xsztbabs,
xszvarabs,
xszvfeabs,
xszvphabs,
xszwabs,
xszwndabs
- slang
-
usermodel
- tools
-
aconvolve,
acrosscorr,
apowerspectrum,
arestore,
csmooth
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