XGal¶

class sherpa.astro.optical.XGal(name='xgal')[source]¶

Bases: sherpa.models.model.ArithmeticModel

Extragalactic extinction: Calzetti, Kinney and Storchi-Bergmann

The extragalactic 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)

Notes

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

References

[1]	Calzetti, Kinney, Storchi-Bergmann, 1994, ApJ, 429, 582 http://adsabs.harvard.edu/abs/1994ApJ...429..582C

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)[source]¶

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()¶