SM

class sherpa.astro.optical.SM(name='sm')

Bases: sherpa.models.model.ArithmeticModel

Galactic extinction: the Savage & Mathis model.

The interstellar extinction is calculated using the formula from [1]. This model is intended to be used to modify another model (e.g. by multiplying the two together). It is for use when the independent axis is in Angstrom.

ebv

E(B-V)

See also

CCM, FM, LMC, Seaton, SMC, XGAL

Notes

When evaluated on a binned grid, the lower-edges of the bins are used for the calculation.

References

[1]	Savage & Mathis, 1979, ARA&A, 17, 73-111 http://adsabs.harvard.edu/abs/1979ARA%26A..17...73S

Attributes Summary

thawedparhardmaxes
thawedparhardmins
thawedparmaxes
thawedparmins
thawedpars

Methods Summary

apply(outer, \*otherargs, \*\*otherkwargs)
calc(p, x[, xhi])
get_center()
guess(dep, \*args, \*\*kwargs)	Set an initial guess for the parameter values.
reset()
set_center(\*args, \*\*kwargs)
startup()
teardown()

Attributes Documentation

thawedparhardmaxes

thawedparhardmins

thawedparmaxes

thawedparmins

thawedpars

Methods Documentation

apply(outer, *otherargs, **otherkwargs)

calc(p, x, xhi=None, **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.

reset()

set_center(*args, **kwargs)

startup()

teardown()