Edge¶
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class
sherpa.astro.models.
Edge
(name='edge')[source] [edit on github]¶ Bases:
sherpa.models.model.RegriddableModel1D
Photoabsorption edge model.
This model can be used when the independent axis is in energy or wavelength space.
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space
¶ Switch to select whether the independent axis is energy or wavelength. This parameter is not fit (
alwaysfrozen
is set), and should be set to either 0, when the independent axis is energy with units of keV, or 1 when the axis is wavelength with units of Angstrom.
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thresh
¶ The edge position (in energy or wavelength units matching the data grid).
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abs
¶ The absorption coefficient.
Notes
A phenomenological photoabsorption edge model as a function of energy:
f(x) = exp(-abs * (x / thresh)^-3) if x >= thresh = 1.0 otherwise
or, as a function of wavelength:
f(x) = exp(-abs * (x / thresh)^3) if x <= thresh = 1.0 otherwise
Attributes Summary
thawedparhardmaxes
thawedparhardmins
thawedparmaxes
thawedparmins
thawedpars
Methods Summary
apply
(outer, *otherargs, **otherkwargs)calc
(pars, xlo, *args, **kwargs)get_center
()guess
(dep, *args, **kwargs)Set an initial guess for the parameter values. regrid
(*arrays)reset
()set_center
(*args, **kwargs)startup
()Called before a model may be evaluated multiple times. teardown
()Called after a model may be evaluated multiple times. Attributes Documentation
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thawedparhardmaxes
¶
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thawedparhardmins
¶
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thawedparmaxes
¶
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thawedparmins
¶
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thawedpars
¶
Methods Documentation
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apply
(outer, *otherargs, **otherkwargs) [edit on github]¶
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calc
(pars, xlo, *args, **kwargs) [edit on github]¶
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get_center
() [edit on github]¶
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guess
(dep, *args, **kwargs) [edit on github]¶ Set an initial guess for the parameter values.
Attempt to set the parameter values, and ranges, for the model to match the data values. This is intended as a rough guess, so it is expected that the model is only evaluated a small number of times, if at all.
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regrid
(*arrays) [edit on github]¶
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reset
() [edit on github]¶
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set_center
(*args, **kwargs) [edit on github]¶
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startup
() [edit on github]¶ Called before a model may be evaluated multiple times.
See also
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teardown
() [edit on github]¶ Called after a model may be evaluated multiple times.
See also
setup()
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