Last modified: December 2018

URL: http://cxc.harvard.edu/sherpa/ahelp/xszdust.html
AHELP for CIAO 4.11 Sherpa v1

xszdust

Context: models

Synopsis

The XSPEC zdust model: extinction by dust grains.

Syntax

xszdust

The xszdust model is a multiplivative 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          z

ATTRIBUTES

The attributes for this object are:

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

XSPEC version

CIAO 4.11 comes with support for version 12.10.0e of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;
print(xspec.get_xsversion())'
12.10.0e

Bugs

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