Synopsis
The XSPEC cglumin convolution model: calculate luminosity
Syntax
xscglumin The xscglumin model is a convolution model component.
Description
The model is described at [1] .
Examples
Example 1
>>> create_model_component("xscglumin", "mdl")
>>> print(mdl)Create a component of the xscglumin 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.Distance frozen 10 0 1e+06 kpc mdl.lg10Lum thawed 40 -100 100 cgs
Example 2
With the following definitions:
>>> xscglumin.cglumin >>> xsphabs.absmdl >>> xspowerlaw.plmdl >>> xsgaussian.gmdl >>> srcmdl = plmdl + gmdl
then the model can be applied in a number of ways, such as:
>>> mdl1 = cglumin(absmdl * srcmdl) >>> mdl2 = absmdl * cglumin(srcmdl) >>> mdl3 = absmdl * (plmdl + cglumin(gmdl))
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| Emin | Minimum energy over which the luminosity is calculated. |
| Emax | Maximum energy over which the luminosity is calculated. |
| Distance | Distance to the source in kpc. |
| lg10Lum | log (base 10) of the luminosity in erg/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] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelCglumin.html
Changes in CIAO
Added in CIAO 4.16
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.