xszigm

Context: models

Synopsis

The XSPEC zigm model: UV/Optical attenuation by the intergalactic medium.

Syntax

xszigm

The xszigm model is a multiplicative model component.

Description

The model is described at [1] .

Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.redshift frozen            0 -3.40282e+38  3.40282e+38           
   mdl.model    frozen            0 -3.40282e+38  3.40282e+38           
   mdl.lyman_limit frozen            1 -3.40282e+38  3.40282e+38

ATTRIBUTES

The attributes for this object are:

Attribute	Definition
redshift	The redshift of the absorber. This parameter can not be thawed.
model	The model to use: 0 is Madau, 1 is Meiksin. This parameter can not be thawed.
lyman_limit	Should photoelectric absorption be included (1), or not (0). This parameter can not be thawed.

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 / xszigm.html