    The XSPEC bvvapec model: velocity broadened APEC thermal plasma model.

xsbvvapec
The xsbvvapec model is an additive model component.

The model is described at [1] , with xsbapec describing how it is implemented in Sherpa.

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

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

mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.kT thawed 6.5 0.0808 68.447 keV mdl.H frozen 1 0 1000 mdl.He frozen 1 0 1000 mdl.Li frozen 1 0 1000 mdl.Be frozen 1 0 1000 mdl.B frozen 1 0 1000 mdl.C frozen 1 0 1000 mdl.N frozen 1 0 1000 mdl.O frozen 1 0 1000 mdl.F frozen 1 0 1000 mdl.Ne frozen 1 0 1000 mdl.Na frozen 1 0 1000 mdl.Mg frozen 1 0 1000 mdl.Al frozen 1 0 1000 mdl.Si frozen 1 0 1000 mdl.P frozen 1 0 1000 mdl.S frozen 1 0 1000 mdl.Cl frozen 1 0 1000 mdl.Ar frozen 1 0 1000 mdl.K frozen 1 0 1000 mdl.Ca frozen 1 0 1000 mdl.Sc frozen 1 0 1000 mdl.Ti frozen 1 0 1000 mdl.V frozen 1 0 1000 mdl.Cr frozen 1 0 1000 mdl.Mn frozen 1 0 1000 mdl.Fe frozen 1 0 1000 mdl.Co frozen 1 0 1000 mdl.Ni frozen 1 0 1000 mdl.Cu frozen 1 0 1000 mdl.Zn frozen 1 0 1000 mdl.Redshift frozen 0 -0.999 10 mdl.Velocity frozen 0 0 10000 km/s mdl.norm thawed 1 0 1e+24

ATTRIBUTES

The attributes for this object are:

Attribute
Definition
kT
The temperature of the plasma, in keV.
H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn
The abundance of the element in solar units.
Redshift
The redshift of the plasma.
Velocity
The gaussian sigma of the velocity broadening, in km/s.
norm
The normalization of the model: see [1] for an explanation of the units.

References

[1] https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelBapec.html

Changes in CIAO

The maximum for the Velocity parameter has been changed from 10^6 to 10^4 km/s.

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

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

December 2023