xszdust

Context: models

Synopsis

The XSPEC zdust model: extinction by dust grains.

Syntax

xszdust

The xszdust model is a multiplicative model component.

Description

The model is described at [1] .

Deprecated in Sherpa 4.10.0

The ebv parameter has been renamed e_bmv to match the XSPEC definition. The name ebv can still be used to access the parameter, but this name will be removed in a future release.

Example

>>> create_model_component("xszdust", "mdl")
>>> print(mdl)

Create a component of the xszdust model and display its default parameters. The output is:

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.method   frozen            1            1            3           
   mdl.E_BmV    thawed          0.1            0          100           
   mdl.Rv       frozen          3.1            0           10           
   mdl.Redshift frozen            0            0           20

ATTRIBUTES

The attributes for this object are:

Attribute	Definition
method	The model to use: 1 is Milky Way, 2 is LMC, 3 is SMC. This parameter can not be thawed.
E_BmV	The color excess, E(B-V).
Rv	The ratio of total to selective extinction.
Redshift	The redshift of the absorber.

References

[1]

XSPEC version

CIAO 4.18 comes with support for version 12.14.0k of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;
print(xspec.get_xsversion())'
12.14.0k

Bugs

See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.

/ sherpa4.18 / ahelp / xszdust.html