xscflux

Context: models

Synopsis

The XSPEC cflux convolution model: calculate flux

Syntax

xscflux

The xscflux model is a convolution model component.

Description

The model is described at [1] .

Examples

Example 1

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.Emin     frozen          0.5            0        1e+06        keV
   mdl.Emax     frozen           10            0        1e+06        keV
   mdl.lg10Flux thawed          -12         -100          100        cgs

Example 2

With the following definitions:

>>> xscflux.cflux
>>> xsphabs.absmdl
>>> xspowerlaw.plmdl
>>> xsgaussian.gmdl
>>> srcmdl = plmdl + gmdl

then the model can be applied in a number of ways, such as:

>>> mdl1 = cflux(absmdl * srcmdl)
>>> mdl2 = absmdl * cflux(srcmdl)
>>> mdl3 = absmdl * (plmdl + cflux(gmdl))

ATTRIBUTES

The attributes for this object are:

Attribute	Definition
Emin	Minimum energy over which the flux is calculated.
Emax	Maximum energy over which the flux is calculated.
lg10Flux	log (base 10) of the flux in erg/cm^2/s

Notes

Unlike XSPEC, the convolution model is applied directly to the model, or models, rather than using the multiplication symbol.

See [1] for the meaning and restrictions, in particular the necessity of freezing the amplitude, or normalization, of the emission component (or components) at 1.

References

[1]

Changes in CIAO

Added in CIAO 4.13

XSPEC version

CIAO 4.18 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.