Last modified: December 2018

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

xspwab

Context: models

Synopsis

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

Syntax

xspwab

The xspwab model is a multiplivative 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       100000 10^22 atoms / cm^2
   mdl.nHmax    thawed            2        1e-07       100000 10^22 atoms / cm^2
   mdl.beta     frozen            1          -10           10           

ATTRIBUTES

The attributes for this object are:

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

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.

See Also

models
xspcfabs