XSbkn2pow

class sherpa.astro.xspec.XSbkn2pow(name='bkn2pow')

Bases: sherpa.astro.xspec.XSAdditiveModel

The XSPEC bkn2pow model: broken power law with two breaks.

The model is described at [1].

PhoIndx1

The power law photon index for energies less than BreakE1.

BreakE1

The first break energy, in keV.

PhoIndx2

The power law photon index for energies greater than BreakE1 but less than BreakE2.

BreakE2

The second break energy, in keV.

PhoIndx3

The power law photon index for energies greater than BreakE2.

norm

The normalization of the model. See [1] for details, as its meaning depends on whether the “POW_EMIN” or “POW_EMAX” keywords have been set with set_xsxset.

See also

XSbknpower, XScutoffpl, XSpowerlaw, XSzcutoffpl, XSzpowerlw

References

[1]	(1, 2) https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelBkn2pow.html

Attributes Summary

thawedparhardmaxes
thawedparhardmins
thawedparmaxes
thawedparmins
thawedpars
version_enabled

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

thawedparhardmaxes

thawedparhardmins

thawedparmaxes

thawedparmins

thawedpars

version_enabled = True

Methods Documentation

apply(outer, *otherargs, **otherkwargs)

calc(pars, xlo, *args, **kwargs)

get_center()

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.

regrid(*arrays)

reset()

set_center(*args, **kwargs)

startup()

Called before a model may be evaluated multiple times.

See also

teardown()

teardown()

Called after a model may be evaluated multiple times.

See also

setup()