Last modified: December 2018

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

xsxion

Context: models

Synopsis

The XSPEC xion model: reflected spectrum of photo-ionized accretion disk/ring.

Syntax

xsxion

The xsxion model is a multiplivative model component.

Description

The model is described at [1] .

Deprecated in Sherpa 4.10.0

The lxld parameter has been renamed lxovrld to match the XSPEC definition. The name lxld can still be used to access the parameter, but this name will be removed in a future release.


Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.height   thawed            5            0          100        r_s
   mdl.lxovrld  thawed          0.3         0.02          100           
   mdl.rate     thawed         0.05        0.001            1           
   mdl.cosAng   thawed          0.9            0            1           
   mdl.inner    thawed            3            2         1000        r_s
   mdl.outer    thawed          100          2.1       100000        r_s
   mdl.index    thawed            2          1.6          2.2           
   mdl.redshift frozen            0       -0.999           10           
   mdl.Feabun   frozen            1            0            5           
   mdl.E_cut    thawed          150           20          300        keV
   mdl.Ref_type frozen            1            1            3           
   mdl.Rel_smear frozen            4            1            4           
   mdl.Geometry frozen            1            1            4           

ATTRIBUTES

The attributes for this object are:

height

The height of the source above the disk (in Schwarzschild radii).

lxovrld

The ratio of the X-ray source luminosity to that of the disk.

rate

The accretion rate (in Eddington units).

cosAng

The cosine of the inclination angle (1 is face on).

inner

The inner radius of the disk (in Schwarzschild radii).

outer

The er radius of the disk (in Schwarzschild radii).

index

The photon index of the source.

redshift

The redshift of the absorber.

Feabun

The Fe abundance relative to Solar: see [1] for more details.

E_cut

The exponential high energy cut-off energy for the source.

Ref_type

See [1] for details.

Ref_smear

See [1] for details.

Geometry

See [1] for details.

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.