Synopsis
The XSPEC compmag model: Thermal and bulk Comptonization for cylindrical accretion onto the polar cap of a magnetized neutron star.
Syntax
xscompmag The xscompmag model is an additive model component.
Description
The model is described at [1] .
Example
>>> create_model_component("xscompmag", "mdl")
>>> print(mdl)Create a component of the xscompmag model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.kTbb thawed 1 0.2 10 keV mdl.kTe thawed 5 0.2 2000 keV mdl.tau thawed 0.5 0 10 mdl.eta thawed 0.5 0.01 1 mdl.beta0 thawed 0.57 0.0001 1 mdl.r0 thawed 0.25 0.0001 100 mdl.A frozen 0.001 0 1 mdl.betaflag frozen 1 0 2 mdl.norm thawed 1 0 1e+24
ATTRIBUTES
The attributes for this object are:
| Attribute | Definition |
|---|---|
| kTbb | The seed blackbody temperature, in keV. |
| kTe | The electron temperature of the accretion column, in keV. |
| tau | The vertical optical depth of the accretion column, with electron cross-section equal to 10^-3 of the Thomson cross-section. |
| eta | The index of the velocity profile when the accretion velocity increases towards the neutron star (valid when betaflag is 1). |
| beta0 | The terminal velocity of the accreting matter at the neutron star surface (valid when betaflag is 1). |
| r0 | The radius of the accretion column in units of the neutron star Schwarzschild radius. |
| A | The albedo at the surface of the neutron star. |
| betaflag | A flag for setting the velocity profile of the accretion column, described at [1] . It has values of 1 or 2 and can not be thawed. |
| norm | The normalization of the model: see [1] for an explanation of the units. |
References
- [1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelCompmag.html
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; print(xspec.get_xsversion())' 12.13.1e
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.