xspwab

Context: models

Synopsis

The XSPEC pwab model: power-law distribution of neutral absorbers.

Syntax

xspwab

The xspwab model is a multiplicative model component.

Description

The model is described at [1] .

Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.nHmin    thawed            1        1e-07        1e+06 10^22 atoms / cm^2
   mdl.nHmax    thawed            2        1e-07        1e+06 10^22 atoms / cm^2
   mdl.beta     frozen            1          -10           20

ATTRIBUTES

The attributes for this object are:

Attribute	Definition
nHmin	The minimum equivalent hydrogen column (in units of 10^22 atoms/cm^2).
nHmax	The maximum equivalent hydrogen column (in units of 10^22 atoms/cm^2).
beta	The power law index for the covering fraction.

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.