Recombination¶
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class
sherpa.astro.optical.
Recombination
(name='recombination')[source]¶ Bases:
sherpa.models.model.RegriddableModel1D
Optically-thin recombination continuum model.
It is for use when the independent axis is in Angstroms.
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refer
¶ The reference point, in Angstroms.
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ampl
¶ The amplitude of the emission; it is defined at the reference point but its numerical value there also depends on the temperature.
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temperature
¶ The temperature in Kelvin.
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fwhm
¶ The full-width half-maximum of the model in km/s.
Notes
The functional form of the model for points is:
f(x) = ampl * (refer / x)^2 * exp(-1.440E8 * (1 / x - 1 / refer) / temperature) if x < refer = ampl * exp(-0.5 * (x - refer)^2 / g(fwhm, refer)^2) otherwise g(fwhm, refer) = refer * fwhm / (2.354820044 * c)
where c is the speed of light in km/s. For integrated data sets the low-edge of the grid is used.
Attributes Summary
thawedparhardmaxes
thawedparhardmins
thawedparmaxes
thawedparmins
thawedpars
Methods Summary
apply
(outer, *otherargs, **otherkwargs)calc
(p, x[, xhi])Evaluate the model on a grid. 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)¶
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calc
(p, x, xhi=None, **kwargs)[source]¶ Evaluate the model on a grid.
Parameters: - p (sequence of numbers) – The parameter values to use. The order matches the
pars
field. - *args – The model grid. The values can be scalar or arrays, and the number depends on the dimensionality of the model and whether it is being evaluated over an integrated grid or at a point (or points).
- p (sequence of numbers) – The parameter values to use. The order matches the
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get_center
()¶
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guess
(dep, *args, **kwargs)¶ 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)¶
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reset
()¶
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set_center
(*args, **kwargs)¶
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startup
()¶ Called before a model may be evaluated multiple times.
See also
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teardown
()¶ Called after a model may be evaluated multiple times.
See also
setup()
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