Last modified: December 2023

AHELP for CIAO 4.16 Sherpa


Context: models


The XSPEC refsch model: reflected power law from ionized accretion disk.



The xsrefsch model is an additive model component.


The model is described at [1] .


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

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

   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.PhoIndex thawed            2          -10           10           
   mdl.foldE    thawed          100            1        1e+06        keV
   mdl.rel_refl thawed            0            0            2           
   mdl.redshift frozen            0       -0.999           10           
   mdl.abund    frozen            1          0.5           10           
   mdl.Fe_abund frozen            1          0.1           10           
   mdl.Incl     frozen           30           19           87        deg
   mdl.T_disk   frozen        30000        10000        1e+06          K
   mdl.xi       thawed            1            0         5000    ergcm/s
   mdl.Betor10  frozen           -2          -10           20           
   mdl.Rin      frozen           10            6        10000        R_g
   mdl.Rout     frozen         1000            0        1e+07        R_g
   mdl.accuracy frozen           30           30       100000           
   mdl.norm     thawed            1            0        1e+24           


The attributes for this object are:

Attribute Definition
PhoIndex The power-law photon index.
foldE The cut-off energy (E_c) in keV. Set to 0 for no cut off.
rel_refl The reflection scaling parameter (a value between 0 and 1 for an isotropic source above the disk, less than 0 for no direct component).
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.
Incl The inclination angle in degrees.
T_disk The disk temperature in K.
xi The disk ionization parameter: see [1] for more details.
Betor10 The power law dependence of emissivity: see [1] for more details.
Rin The inner radius, in units of GM^2/c.
Rout The outer radius, in units of GM^2/c.
accuracy The internal model accuracy: points of spectrum per energy decade.
norm The normalization of the model: see [1] for an explanation of the units.


XSPEC version

CIAO 4.16 comes with support for version 12.13.1e of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;


See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.