xsbexriv

Context: models

Synopsis

The XSPEC bexriv model: reflected e-folded broken power law, ionized medium.

Syntax

xsbexriv

The xsbexriv model is an additive model component.

Description

The model is described at [1] .

Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.Gamma1   thawed            2          -10           10           
   mdl.breakE   thawed           10          0.1         1000        keV
   mdl.Gamma2   thawed            2          -10           10           
   mdl.foldE    thawed          100            1        1e+06        keV
   mdl.rel_refl thawed            0            0        1e+06           
   mdl.Redshift frozen            0       -0.999           10           
   mdl.abund    frozen            1            0        1e+06           
   mdl.Fe_abund frozen            1            0        1e+06           
   mdl.cosIncl  frozen         0.45         0.05         0.95           
   mdl.T_disk   frozen        30000        10000        1e+06          K
   mdl.xi       thawed            1            0         5000   erg cm/s
   mdl.norm     thawed            1            0        1e+24

ATTRIBUTES

The attributes for this object are:

Attribute	Definition
Gamma1	The power-law index of the first power-law component.
breakE	The break energy, in keV.
Gamma2	The power-law index of the second power-law component.
foldE	The e-folding energy (Ec) in keV. If zero there is no cut off.
rel_refl	The reflection scaling parameter (a value of 1 for an isotropic source above the disk).
Redshift	The redshift of the source.
abund	The abundance of the elements heavier than He relative to their solar abundance, as set by the set_xsabund function.
Fe_abund	The iron abundance relative to the solar abundance, as set by the set_xsabund function.
cosIncl	The cosine of the inclination angle.
T_disk	The disk temperature in K.
xi	The disk ionization parameter: see [1] for an explanation.
norm	The normalization of the model: see [1] for an explanation of the units.

Notes

The precision of the numerical integration can be changed by using the set_xsxset function to set the value of the BEXRIV_PRECISION keyword, which defines the fractional precision. The default is 0.01 (1%).

References

[1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelBexriv.html

XSPEC version

CIAO 4.17 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.