Last modified: December 2018

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

xsplcabs

Context: models

Synopsis

The XSPEC plcabs model: powerlaw observed through dense, cold matter.

Syntax

xsplcabs

The xsplcabs model is an additive model component.

Description

The model is described at [1] .


Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.nH       thawed            1            0       100000 10^22 atoms / cm^2
   mdl.nmax     frozen            1 -3.40282e+38  3.40282e+38           
   mdl.FeAbun   frozen            1            0           10           
   mdl.FeKedge  frozen         7.11            7           10        KeV
   mdl.PhoIndex thawed            2           -2            9           
   mdl.HighECut frozen           95            1          100        keV
   mdl.foldE    frozen          100            1        1e+06           
   mdl.acrit    frozen            1            0            1           
   mdl.FAST     frozen            0 -3.40282e+38  3.40282e+38           
   mdl.redshift frozen            0       -0.999           10           
   mdl.norm     thawed            1            0        1e+24           

ATTRIBUTES

The attributes for this object are:

nH

The column density, in units of 10^22 cm^-2.

nmax

The maximum number of scatterings. This parameter can not be thawed.

FeAbun

The iron abundance.

FeKedge

The energy of the Fe K edge, in keV.

PhoIndex

The power law photon index.

HighECut

The high-energy cut-off threshold energy, in keV.

foldE

The high-energy cut-off e-folding energy, in keV.

acrit

The critical albedo for switching to elastic scattering. See [1] for more details.

FAST

If set to a value above 1, use a mean energy shift instead of integration. This parameter can not be thawed.

redshift

The redshift of the source.

norm

The normalization of the model.

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.