Last modified: December 2020

URL: https://cxc.cfa.harvard.edu/sherpa/ahelp/xscomptb.html
AHELP for CIAO 4.13 Sherpa v1

xscomptb

Context: models

Synopsis

The XSPEC comptb model: Thermal and bulk Comptonization of a seed blackbody-like spectrum.

Syntax

xscomptb

The xscomptb model is an additive model component.

Description

The model is described at [1] .


Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.kTs      thawed            1          0.1           10        keV
   mdl.gamma    frozen            3            1           10           
   mdl.alpha    thawed            2            0          400           
   mdl.delta    thawed           20            0          200           
   mdl.kTe      thawed            5          0.2         2000        keV
   mdl.log_A    thawed            0           -8            8           
   mdl.norm     thawed            1            0        1e+24           

ATTRIBUTES

The attributes for this object are:

Attribute Definition
kTs The temperature of the seed photons, in keV.
gamma The index of the seed photon spectrum.
alpha The energy index of the Comptonization spectrum.
delta The bulk parameter, efficiency of bulk over thermal Comptonization.
kTe The temperature of the electrons, in keV.
log_A The log of the illuminating factor parameter (A).
norm The normalization of the seed photon spectrum: it is the same definition as used for the xsbbody model.

References

XSPEC version

CIAO 4.13 comes with support for version 12.10.1s of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;
print(xspec.get_xsversion())'
12.10.1s

Bugs

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